added wait_pid to be run in set_error.

Closes #338.

.drone.star

@@ -0,0 +1,38 @@
+# Use, modification, and distribution are
+# subject to the Boost Software License, Version 1.0. (See accompanying
+# file LICENSE.txt)
+#
+# Copyright Rene Rivera 2020.
+
+# For Drone CI we use the Starlark scripting language to reduce duplication.
+# As the yaml syntax for Drone CI is rather limited.
+#
+#
+globalenv={'B2_CI_VERSION': '1', 'B2_VARIANT': 'release'}
+linuxglobalimage="cppalliance/droneubuntu1804:1"
+windowsglobalimage="cppalliance/dronevs2019"
+
+def main(ctx):
+  return [
+  freebsd_cxx("gcc 11 freebsd", "g++-11", buildtype="boost", buildscript="drone", freebsd_version="13.1", environment={'B2_TOOLSET': 'gcc-11', 'B2_CXXSTD': '17,20', 'B2_LINKFLAGS': '-Wl,-rpath=/usr/local/lib/gcc11'}, globalenv=globalenv),
+  freebsd_cxx("clang 14 freebsd", "clang++-14", buildtype="boost", buildscript="drone", freebsd_version="13.1", environment={'B2_TOOLSET': 'clang-14', 'B2_CXXSTD': '17,20'}, globalenv=globalenv),
+  linux_cxx("docs", "", packages="docbook docbook-xml docbook-xsl xsltproc libsaxonhe-java default-jre-headless flex libfl-dev bison unzip rsync", image="cppalliance/droneubuntu1804:1", buildtype="docs", buildscript="drone", environment={"COMMENT": "docs"}, globalenv=globalenv),
+  linux_cxx("asan",         "g++-8",  packages="g++-8",  buildtype="boost", buildscript="drone", image=linuxglobalimage,                        environment={'COMMENT': 'asan',  'B2_VARIANT': 'debug', 'B2_TOOLSET': 'gcc-8',  'B2_CXXSTD': '11', 'B2_ASAN':  '1', 'B2_DEFINES': 'BOOST_NO_STRESS_TEST=1', 'DRONE_EXTRA_PRIVILEGED': 'True', 'DRONE_JOB_UUID': '356a192b79'}, globalenv=globalenv, privileged=True),
+  linux_cxx("ubsan",        "g++-8",  packages="g++-8",  buildtype="boost", buildscript="drone", image=linuxglobalimage,                        environment={'COMMENT': 'ubsan', 'B2_VARIANT': 'debug', 'B2_TOOLSET': 'gcc-8',  'B2_CXXSTD': '11', 'B2_UBSAN': '1', 'B2_DEFINES': 'BOOST_NO_STRESS_TEST=1', 'B2_LINKFLAGS': '-fuse-ld=gold',  'DRONE_JOB_UUID': '77de68daec'}, globalenv=globalenv),
+  #linux_cxx("gcc 11 arm64", "g++-11", packages="g++-11", buildtype="boost", buildscript="drone", image="cppalliance/droneubuntu2004:multiarch", environment={                                           'B2_TOOLSET': 'gcc-11', 'B2_CXXSTD': '11',                                                                                            'DRONE_JOB_UUID': '17ba079169m'}, arch="arm64", globalenv=globalenv),
+  linux_cxx("GCC 10, Debug + Coverage", "g++-10", packages="g++-10 libssl-dev libffi-dev binutils-gold gdb",
+                                                                                                 image="cppalliance/droneubuntu2004:1", buildtype="boost", buildscript="drone", environment={"GCOV": "gcov-10", "LCOV_VERSION": "1.15", "VARIANT": "process_coverage", "TOOLSET": "gcc", "COMPILER": "g++-10", "CXXSTD": "11", "DRONE_BEFORE_INSTALL" : "process_coverage", "CODECOV_TOKEN": {"from_secret": "codecov_token"}}, globalenv=globalenv, privileged=True),
+  # A set of jobs based on the earlier .travis.yml configuration:
+  linux_cxx("Default clang++ with libc++", "clang++-libc++", packages="libc++-dev", image="cppalliance/droneubuntu1604:1", buildtype="buildtype", buildscript="drone", environment={ "B2_TOOLSET": "clang-7", "B2_CXXSTD": "11", "VARIANT": "debug", "TOOLSET": "clang", "COMPILER": "clang++-libc++", "CXXSTD": "11", "CXX_FLAGS": "<cxxflags>-stdlib=libc++ <linkflags>-stdlib=libc++", "TRAVISCLANG" : "yes" }, globalenv=globalenv),
+  linux_cxx("Default g++", "g++", image="cppalliance/droneubuntu1604:1", buildtype="buildtype", buildscript="drone", environment={ "VARIANT": "release", "TOOLSET": "gcc", "COMPILER": "g++", "CXXSTD": "11" }, globalenv=globalenv),
+  linux_cxx("Clang 3.8, UBasan", "clang++-3.8", packages="clang-3.8 libssl-dev", llvm_os="precise", llvm_ver="3.8", image="cppalliance/droneubuntu1604:1", buildtype="boost", buildscript="drone", environment={"VARIANT": "process_ubasan", "TOOLSET": "clang", "COMPILER": "clang++-3.8", "CXXSTD": "11", "UBSAN_OPTIONS": 'print_stacktrace=1', "DRONE_BEFORE_INSTALL": "UBasan" }, globalenv=globalenv),
+  linux_cxx("gcc 6", "g++-6", packages="g++-6", buildtype="boost", buildscript="drone", image=linuxglobalimage, environment={'B2_TOOLSET': 'gcc-6', 'B2_CXXSTD': '11', 'DRONE_JOB_UUID': '902ba3cda1'}, globalenv=globalenv),
+  linux_cxx("clang 3.8", "clang++-3.8", packages="clang-3.8", buildtype="boost", buildscript="drone", image="cppalliance/droneubuntu1604:1", environment={'B2_TOOLSET': 'clang', 'COMPILER': 'clang++-3.8', 'B2_CXXSTD': '11', 'DRONE_JOB_UUID': '7b52009b64'}, globalenv=globalenv),
+  osx_cxx("clang", "g++", packages="", buildtype="boost",         buildscript="drone", environment={'B2_TOOLSET': 'clang', 'B2_CXXSTD': '11,17', 'DRONE_JOB_UUID': '91032ad7bb'}, globalenv=globalenv),
+  linux_cxx("coverity", "g++", packages="", buildtype="coverity", buildscript="drone", image=linuxglobalimage, environment={'COMMENT': 'Coverity Scan', 'B2_TOOLSET': 'clang', 'DRONE_JOB_UUID': '472b07b9fc'}, globalenv=globalenv),
+  windows_cxx("msvc-14.1", "", image="cppalliance/dronevs2017",   buildtype="boost", buildscript="drone", environment={ "VARIANT": "release", "TOOLSET": "msvc-14.1", "CXXSTD": "11", "DEFINE" : "BOOST_BEAST_USE_STD_STRING_VIEW", "ADDRESS_MODEL": "64"}),
+  windows_cxx("msvc-14.3", "", image="cppalliance/dronevs2022:1", buildtype="boost", buildscript="drone", environment={ "VARIANT": "release", "TOOLSET": "msvc-14.3", "CXXSTD": "11", "DEFINE" : "BOOST_BEAST_USE_STD_STRING_VIEW", "ADDRESS_MODEL": "64"}),
+    ]
+
+# from https://github.com/boostorg/boost-ci
+load("@boost_ci//ci/drone/:functions.star", "linux_cxx","windows_cxx","osx_cxx","freebsd_cxx")

.drone/drone.bat

@@ -0,0 +1,34 @@
+@ECHO ON
+setlocal enabledelayedexpansion
+
+if "%DRONE_JOB_BUILDTYPE%" == "boost" (
+
+echo '==================================> INSTALL'
+
+git clone https://github.com/boostorg/boost-ci.git boost-ci-cloned --depth 1
+cp -prf boost-ci-cloned/ci .
+rm -rf boost-ci-cloned
+
+REM source ci/travis/install.sh
+REM The contents of install.sh below:
+
+for /F %%i in ("%DRONE_REPO%") do @set SELF=%%~nxi
+SET BOOST_CI_TARGET_BRANCH=%DRONE_COMMIT_BRANCH%
+SET BOOST_CI_SRC_FOLDER=%cd%
+
+call ci\common_install.bat
+
+echo '==================================> COMPILE'
+
+REM set B2_TARGETS=libs/!SELF!/test libs/!SELF!/example
+set B2_TARGETS=libs/!SELF!/test
+
+cd !BOOST_ROOT!
+call bootstrap.bat
+b2 headers
+b2 --debug-configuration variant=%VARIANT% cxxstd=%CXXSTD% define=%DEFINE% address-model=%ADDRESS_MODEL% toolset=%TOOLSET% --verbose-test libs/!SELF!/test libs/!SELF!/example -j3
+) else if "%DRONE_JOB_BUILDTYPE%" == "standalone-windows" (
+
+REM not used
+
+)

.drone/drone.sh

@@ -0,0 +1,199 @@
+#!/bin/bash
+
+# Copyright 2020 Rene Rivera, Sam Darwin
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE.txt or copy at http://boost.org/LICENSE_1_0.txt)
+
+set -xe
+
+export TRAVIS_BUILD_DIR=$(pwd)
+export DRONE_BUILD_DIR=$(pwd)
+export TRAVIS_BRANCH=$DRONE_BRANCH
+export TRAVIS_EVENT_TYPE=$DRONE_BUILD_EVENT
+export VCS_COMMIT_ID=$DRONE_COMMIT
+export GIT_COMMIT=$DRONE_COMMIT
+export REPO_NAME=$DRONE_REPO
+export USER=$(whoami)
+export CC=${CC:-gcc}
+export PATH=~/.local/bin:/usr/local/bin:$PATH
+
+common_install () {
+  git clone https://github.com/boostorg/boost-ci.git boost-ci-cloned --depth 1
+  cp -prf boost-ci-cloned/ci .
+  rm -rf boost-ci-cloned
+
+  if [ "$TRAVIS_OS_NAME" == "osx" ]; then
+      unset -f cd
+  fi
+
+  export SELF=`basename $REPO_NAME`
+  export BOOST_CI_TARGET_BRANCH="$TRAVIS_BRANCH"
+  export BOOST_CI_SRC_FOLDER=$(pwd)
+
+  . ./ci/common_install.sh
+}
+
+if [ "$DRONE_JOB_BUILDTYPE" == "boost" ]; then
+
+echo '==================================> INSTALL'
+
+common_install
+
+echo '==================================> SCRIPT'
+
+$BOOST_ROOT/libs/$SELF/ci/travis/build.sh
+
+elif [ "$DRONE_JOB_BUILDTYPE" == "docs" ]; then
+
+echo '==================================> INSTALL'
+
+export SELF=`basename $REPO_NAME`
+
+pwd
+cd ..
+mkdir -p $HOME/cache && cd $HOME/cache
+if [ ! -d doxygen ]; then git clone -b 'Release_1_8_15' --depth 1 https://github.com/doxygen/doxygen.git && echo "not-cached" ; else echo "cached" ; fi
+cd doxygen
+cmake -H. -Bbuild -DCMAKE_BUILD_TYPE=Release
+cd build
+sudo make install
+cd ../..
+if [ ! -f saxonhe.zip ]; then wget -O saxonhe.zip https://sourceforge.net/projects/saxon/files/Saxon-HE/9.9/SaxonHE9-9-1-4J.zip/download && echo "not-cached" ; else echo "cached" ; fi
+unzip -o saxonhe.zip
+sudo rm /usr/share/java/Saxon-HE.jar
+sudo cp saxon9he.jar /usr/share/java/Saxon-HE.jar
+cd ..
+BOOST_BRANCH=develop && [ "$TRAVIS_BRANCH" == "master" ] && BOOST_BRANCH=master || true
+git clone -b $BOOST_BRANCH https://github.com/boostorg/boost.git boost-root --depth 1
+cd boost-root
+export BOOST_ROOT=$(pwd)
+git submodule update --init libs/context
+git submodule update --init tools/boostbook
+git submodule update --init tools/boostdep
+git submodule update --init tools/docca
+git submodule update --init tools/quickbook
+rsync -av $TRAVIS_BUILD_DIR/ libs/$SELF
+python tools/boostdep/depinst/depinst.py ../tools/quickbook
+./bootstrap.sh
+./b2 headers
+
+echo '==================================> SCRIPT'
+
+echo "using doxygen ; using boostbook ; using saxonhe ;" > tools/build/src/user-config.jam
+./b2 -j3 libs/$SELF/doc//boostrelease
+
+elif [ "$DRONE_JOB_BUILDTYPE" == "codecov" ]; then
+
+echo '==================================> INSTALL'
+
+common_install
+
+echo '==================================> SCRIPT'
+
+cd $BOOST_ROOT/libs/$SELF
+ci/travis/codecov.sh
+
+elif [ "$DRONE_JOB_BUILDTYPE" == "valgrind" ]; then
+
+echo '==================================> INSTALL'
+
+common_install
+
+echo '==================================> SCRIPT'
+
+cd $BOOST_ROOT/libs/$SELF
+ci/travis/valgrind.sh
+
+elif [ "$DRONE_JOB_BUILDTYPE" == "standalone" ]; then
+
+echo '==================================> INSTALL'
+
+# Installing cmake with apt-get, so not required here:
+# pip install --user cmake
+
+echo '==================================> SCRIPT'
+
+export CXXFLAGS="-Wall -Wextra -Werror -std=c++17"
+mkdir __build_17
+cd __build_17
+cmake -DBOOST_JSON_STANDALONE=1 ..
+cmake --build .
+ctest -V .
+export CXXFLAGS="-Wall -Wextra -Werror -std=c++2a"
+mkdir ../__build_2a
+cd ../__build_2a
+cmake -DBOOST_JSON_STANDALONE=1 ..
+cmake --build .
+ctest -V .
+
+elif [ "$DRONE_JOB_BUILDTYPE" == "coverity" ]; then
+
+echo '==================================> INSTALL'
+
+common_install
+
+echo '==================================> SCRIPT'
+
+if [ $VARIANT = "process_valgrind" ];
+then export USE_VALGRIND="testing.launcher=valgrind valgrind=on";
+fi ;
+
+if  [ -n "${COVERITY_SCAN_NOTIFICATION_EMAIL}" -a \( "$TRAVIS_BRANCH" = "develop" -o "$TRAVIS_BRANCH" = "master" \) -a \( "$DRONE_BUILD_EVENT" = "push" -o "$DRONE_BUILD_EVENT" = "cron" \) ] ; then
+cd $BOOST_ROOT/libs/$SELF
+ci/travis/coverity.sh
+fi
+
+elif [ "$DRONE_JOB_BUILDTYPE" == "cmake-superproject" ]; then
+
+echo '==================================> INSTALL'
+
+common_install
+
+echo '==================================> COMPILE'
+
+export CXXFLAGS="-Wall -Wextra -Werror"
+
+mkdir __build_static
+cd __build_static
+cmake -DBOOST_ENABLE_CMAKE=1 -DBUILD_TESTING=ON -DBoost_VERBOSE=1 \
+    -DBOOST_INCLUDE_LIBRARIES=$SELF ..
+cmake --build .
+ctest --output-on-failure -R boost_$SELF
+
+cd ..
+
+mkdir __build_shared
+cd __build_shared
+cmake -DBOOST_ENABLE_CMAKE=1 -DBUILD_TESTING=ON -DBoost_VERBOSE=1 \
+    -DBOOST_INCLUDE_LIBRARIES=$SELF -DBUILD_SHARED_LIBS=ON ..
+cmake --build .
+ctest --output-on-failure -R boost_$SELF
+
+elif [ "$DRONE_JOB_BUILDTYPE" == "cmake1" ]; then
+
+echo '==================================> INSTALL'
+
+pip install --user cmake
+
+echo '==================================> SCRIPT'
+
+export SELF=`basename $REPO_NAME`
+BOOST_BRANCH=develop && [ "$DRONE_BRANCH" == "master" ] && BOOST_BRANCH=master || true
+echo BOOST_BRANCH: $BOOST_BRANCH
+cd ..
+git clone -b $BOOST_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
+cd boost-root
+mkdir -p libs/$SELF
+cp -r $DRONE_BUILD_DIR/* libs/$SELF
+# git submodule update --init tools/boostdep
+git submodule update --init --recursive
+
+cd libs/$SELF
+
+../../../b2 -sBOOST_BUILD_PATH=.
+../../../b2 $MULTITHREAD with-valgrind address-model=64 architecture=x86 $USE_VALGRIND toolset=$TOOLSET cxxflags="--coverage -DBOOST_TRAVISCI_BUILD -std=$CXX_STANDARD" linkflags="--coverage" -sBOOST_BUILD_PATH=. $REPORT_CI
+../../../b2 $MULTITHREAD without-valgrind address-model=64 architecture=x86 toolset=$TOOLSET cxxflags="--coverage -DBOOST_TRAVISCI_BUILD -std=$CXX_STANDARD" linkflags="--coverage" -sBOOST_BUILD_PATH=. $REPORT_CI
+
+
+
+fi

.github/workflows/ci.yml

@@ -0,0 +1,201 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+      - develop
+      - feature/**
+
+env:
+  UBSAN_OPTIONS: print_stacktrace=1
+
+jobs:
+  posix:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - toolset: gcc-5
+            cxxstd: "11,14,1z"
+            os: ubuntu-18.04
+            install: g++-5
+          - toolset: gcc-6
+            cxxstd: "11,14,1z"
+            os: ubuntu-18.04
+            install: g++-6
+          - toolset: gcc-7
+            cxxstd: "11,14,17"
+            os: ubuntu-18.04
+          - toolset: gcc-10
+            cxxstd: "11,14,17,2a"
+            os: ubuntu-20.04
+            install: g++-10
+          - toolset: gcc-12
+            cxxstd: "11,14,17,20,2b"
+            os: ubuntu-22.04
+            install: g++-12
+          - toolset: clang
+            compiler: clang++-3.9
+            cxxstd: "11,14"
+            os: ubuntu-18.04
+            install: clang-3.9
+          - toolset: clang
+            compiler: clang++-4.0
+            cxxstd: "11,14"
+            os: ubuntu-18.04
+            install: clang-4.0
+          - toolset: clang
+            compiler: clang++-5.0
+            cxxstd: "11,14,1z"
+            os: ubuntu-18.04
+            install: clang-5.0
+          - toolset: clang
+            compiler: clang++-6.0
+            cxxstd: "11,14,17"
+            os: ubuntu-18.04
+            install: clang-6.0
+          - toolset: clang
+            compiler: clang++-7
+            cxxstd: "11,14,17"
+            os: ubuntu-18.04
+            install: clang-7
+          - toolset: clang
+            compiler: clang++-8
+            cxxstd: "11,14,17"
+            os: ubuntu-20.04
+            install: clang-8
+          - toolset: clang
+            compiler: clang++-9
+            cxxstd: "11,14,17,2a"
+            os: ubuntu-20.04
+            install: clang-9
+          - toolset: clang
+            compiler: clang++-10
+            cxxstd: "11,14,17,2a"
+            os: ubuntu-20.04
+            install: clang-10
+          - toolset: clang
+            compiler: clang++-11
+            cxxstd: "11,14,17,2a"
+            os: ubuntu-20.04
+            install: clang-11
+          - toolset: clang
+            compiler: clang++-12
+            cxxstd: "11,14,17,2a"
+            os: ubuntu-20.04
+            install: clang-12
+          - toolset: clang
+            compiler: clang++-13
+            cxxstd: "11,14,17,20,2b"
+            os: ubuntu-22.04
+            install: clang-13
+          - toolset: clang
+            compiler: clang++-14
+            cxxstd: "11,14,17,20,2b"
+            os: ubuntu-22.04
+            install: clang-14
+          - toolset: clang
+            cxxstd: "11,14,17,2a"
+            os: macos-11
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install packages
+        if: matrix.install
+        run: sudo apt install ${{matrix.install}}
+
+      - name: Setup Boost
+        run: |
+          echo GITHUB_REPOSITORY: $GITHUB_REPOSITORY
+          LIBRARY=${GITHUB_REPOSITORY#*/}
+          echo LIBRARY: $LIBRARY
+          echo "LIBRARY=$LIBRARY" >> $GITHUB_ENV
+          echo GITHUB_BASE_REF: $GITHUB_BASE_REF
+          echo GITHUB_REF: $GITHUB_REF
+          REF=${GITHUB_BASE_REF:-$GITHUB_REF}
+          REF=${REF#refs/heads/}
+          echo REF: $REF
+          BOOST_BRANCH=develop && [ "$REF" == "master" ] && BOOST_BRANCH=master || true
+          echo BOOST_BRANCH: $BOOST_BRANCH
+          cd ..
+          git clone -b $BOOST_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
+          cd boost-root
+          cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
+          git submodule update --init tools/boostdep
+          python tools/boostdep/depinst/depinst.py --git_args "--jobs 3" $LIBRARY
+          ./bootstrap.sh
+          ./b2 -d0 headers
+
+      - name: Create user-config.jam
+        if: matrix.compiler
+        run: |
+          echo "using ${{matrix.toolset}} : : ${{matrix.compiler}} ;" > ~/user-config.jam
+
+      - name: Run tests
+        run: |
+          cd ../boost-root
+          ./b2 -j3 libs/$LIBRARY/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} variant=debug,release
+
+  windows:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - toolset: msvc-14.0
+            cxxstd: "14,latest"
+            addrmd: 32,64
+            os: windows-2019
+          - toolset: msvc-14.2
+            cxxstd: "14,17,20,latest"
+            addrmd: 32,64
+            os: windows-2019
+          - toolset: msvc-14.3
+            cxxstd: "14,17,20,latest"
+            addrmd: 32,64
+            os: windows-2022
+          - toolset: clang-win
+            cxxstd: "14,17,latest"
+            addrmd: 32,64
+            os: windows-2022
+          - toolset: gcc
+            cxxstd: "11,14,17,2a"
+            addrmd: 64
+            os: windows-2019
+
+    runs-on: ${{matrix.os}}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Boost
+        shell: cmd
+        run: |
+          echo GITHUB_REPOSITORY: %GITHUB_REPOSITORY%
+          for /f %%i in ("%GITHUB_REPOSITORY%") do set LIBRARY=%%~nxi
+          echo LIBRARY: %LIBRARY%
+          echo LIBRARY=%LIBRARY%>>%GITHUB_ENV%
+          echo GITHUB_BASE_REF: %GITHUB_BASE_REF%
+          echo GITHUB_REF: %GITHUB_REF%
+          if "%GITHUB_BASE_REF%" == "" set GITHUB_BASE_REF=%GITHUB_REF%
+          set BOOST_BRANCH=develop
+          for /f %%i in ("%GITHUB_BASE_REF%") do if "%%~nxi" == "master" set BOOST_BRANCH=master
+          echo BOOST_BRANCH: %BOOST_BRANCH%
+          cd ..
+          git clone -b %BOOST_BRANCH% --depth 1 https://github.com/boostorg/boost.git boost-root
+          cd boost-root
+          xcopy /s /e /q %GITHUB_WORKSPACE% libs\%LIBRARY%\
+          git submodule update --init tools/boostdep
+          python tools/boostdep/depinst/depinst.py --git_args "--jobs 3" %LIBRARY%
+          cmd /c bootstrap
+          b2 -d0 headers
+
+      - name: Run tests
+        shell: cmd
+        run: |
+          cd ../boost-root
+          b2 -j3 libs/%LIBRARY%/test toolset=${{matrix.toolset}} cxxstd=${{matrix.cxxstd}} address-model=${{matrix.addrmd}} variant=debug,release embed-manifest-via=linker

.gitignore

@@ -31,4 +31,5 @@
 /notes.cpp
 /notes_p.txt
 .settings
+.DS_Store
 

CMakeLists.txt

@@ -11,7 +11,6 @@ add_library(boost_process INTERFACE)
 add_library(Boost::process ALIAS boost_process)
 
 target_include_directories(boost_process INTERFACE include)
-
 target_link_libraries(boost_process
   INTERFACE
     Boost::algorithm

README.md

@@ -1,18 +1,21 @@
-# [Boost Process (Boost.Process)](https://github.com/klemens-morgenstern/boost-process)
+# [Boost Process (Boost.Process)](https://github.com/boostorg/process)
 
 Boost.process is a library for comfortable management of processes, released with boost 1.64.0.
 
 ### Test results
 
-Branches        | Linux | OSX | Windows | Code coverage | Matrix | 
-----------------|-------|-----|---------| ------------- |--------|
-Develop:        | [![Build Status](https://travis-ci.org/klemens-morgenstern/boost-process.svg?branch=develop&env=BADGE=linux)](https://travis-ci.org/klemens-morgenstern/boost-process) [![badge](https://api.report.ci/status/klemens-morgenstern/boost-process/badge.svg?branch=develop&build=linux)](https://api.report.ci/status/klemens-morgenstern/boost-process?branch=develop&build=linux) | [![Build Status](https://travis-ci.org/klemens-morgenstern/boost-process.svg?branch=develop&env=BADGE=osx)](https://travis-ci.org/klemens-morgenstern/boost-process)  [![badge](https://api.report.ci/status/klemens-morgenstern/boost-process/badge.svg?branch=develop&build=osx)](https://api.report.ci/status/klemens-morgenstern/boost-process?branch=develop&build=osx) | [![Build status](https://ci.appveyor.com/api/projects/status/peup7e6m0e1bb5ba/branch/develop?svg=true)](https://ci.appveyor.com/project/klemens-morgenstern/boost-process/branch/develop) [![badge](https://api.report.ci/status/klemens-morgenstern/boost-process/badge.svg?branch=develop&build=windows)](https://api.report.ci/status/klemens-morgenstern/boost-process?branch=develop&build=windows) | [![Coverage Status](https://coveralls.io/repos/github/klemens-morgenstern/boost-process/badge.svg?branch=develop)](https://coveralls.io/github/klemens-morgenstern/boost-process?branch=develop) | [![Matrix](https://img.shields.io/badge/matrix-develop-lightgray.svg)](http://www.boost.org/development/tests/develop/developer/process.html)
-Master:         | [![Build Status](https://travis-ci.org/klemens-morgenstern/boost-process.svg?branch=master&env=BADGE=linux)](https://travis-ci.org/klemens-morgenstern/boost-process)  [![badge](https://api.report.ci/status/klemens-morgenstern/boost-process/badge.svg?branch=master&build=linux)](https://api.report.ci/status/klemens-morgenstern/boost-process?branch=master&build=linux)   | [![Build Status](https://travis-ci.org/klemens-morgenstern/boost-process.svg?branch=master&env=BADGE=osx)](https://travis-ci.org/klemens-morgenstern/boost-process)   [![badge](https://api.report.ci/status/klemens-morgenstern/boost-process/badge.svg?branch=master&build=osx)](https://api.report.ci/status/klemens-morgenstern/boost-process?branch=master&build=osx)   | [![Build status](https://ci.appveyor.com/api/projects/status/peup7e6m0e1bb5ba/branch/master?svg=true)](https://ci.appveyor.com/project/klemens-morgenstern/boost-process/branch/master)   [![badge](https://api.report.ci/status/klemens-morgenstern/boost-process/badge.svg?branch=master&build=windows)](https://api.report.ci/status/klemens-morgenstern/boost-process?branch=master&build=windows) | [![Coverage Status](https://coveralls.io/repos/github/klemens-morgenstern/boost-process/badge.svg?branch=master)](https://coveralls.io/github/klemens-morgenstern/boost-process?branch=master)   | [![Matrix](https://img.shields.io/badge/matrix-master-lightgray.svg)](http://www.boost.org/development/tests/master/developer/process.html)
+| Branches | Linux / Windows                                                                                                                              | Code coverage                                                                                                                                | Matrix                                                                                                                                        | 
+|----------|----------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------|
+| Develop: | [![Build Status](https://drone.cpp.al/api/badges/boostorg/process/status.svg)](https://drone.cpp.al/boostorg/process)                        | [![codecov](https://codecov.io/gh/boostorg/process/branch/develop/graph/badge.svg?token=AhunMqTSpA)](https://codecov.io/gh/boostorg/process) | [![Matrix](https://img.shields.io/badge/matrix-develop-lightgray.svg)](http://www.boost.org/development/tests/develop/developer/process.html) |
+| Master:  | [![Build Status](https://drone.cpp.al/api/badges/boostorg/process/status.svg?ref=refs/heads/develop)](https://drone.cpp.al/boostorg/process) | [![codecov](https://codecov.io/gh/boostorg/process/branch/master/graph/badge.svg?token=AhunMqTSpA)](https://codecov.io/gh/boostorg/process)  | [![Matrix](https://img.shields.io/badge/matrix-master-lightgray.svg)](http://www.boost.org/development/tests/master/developer/process.html)   |
 
 
-[Open Issues](https://github.com/klemens-morgenstern/boost-process/issues)
 
-[Latest developer documentation](http://klemens-morgenstern.github.io/process/)
+
+
+[Open Issues](https://github.com/boostorg/process/issues)
+
+[Latest developer documentation](https://www.boost.org/doc/libs/develop/doc/html/process.html)
 
 ### About
 This C++11 library is the current result of a long attempt to get a boost.process library, which is going on since 2006.

doc/Jamfile.jam

@@ -24,12 +24,13 @@ generators.register-standard common.copy : XML : XMLPROCESSWORKAROUND ;
 xmlprocessworkaround posix_pseudocode   : posix_pseudocode.xml   ; 
 xmlprocessworkaround windows_pseudocode : windows_pseudocode.xml ;
 
+path-constant INCLUDES : ../../.. ;
 
 doxygen autodoc
 :
-  ../../../boost/process.hpp
-  [ glob ../../../boost/process/*.hpp ]
-:
+  $(INCLUDES)/boost/process.hpp
+  [ glob $(INCLUDES)/boost/process/*.hpp ]
+  :
   <doxygen:param>EXCLUDE_SYMBOLS=BOOST_ASIO_INITFN_RESULT_TYPE
   <doxygen:param>PREDEFINED=BOOST_PROCESS_DOXYGEN
   <doxygen:param>HIDE_UNDOC_CLASSES=YES
@@ -42,11 +43,49 @@ doxygen autodoc
 
 
 
+doxygen reference_v2
+:
+  $(INCLUDES)/boost/process/v2.hpp
+  [ glob $(INCLUDES)/boost/process/v2/*.hpp ]
+  :
+  <doxygen:param>EXCLUDE_SYMBOLS=BOOST_ASIO_INITFN_RESULT_TYPE
+  <doxygen:param>PROJECT_NAME="Process V2"
+  <doxygen:param>PROJECT_BRIEF="The process library"
+  <doxygen:param>MACRO_EXPANSION=YES
+  <doxygen:param>EXPAND_ONLY_PREDEF=YES
+  <doxygen:param>"PREDEFINED=\\
+    GENERATING_DOCUMENTATION=1 \\
+    BOOST_PROCESS_V2_ASIO_NAMESPACE=boost::asio \\
+    \"BOOST_PROCESS_V2_BEGIN_NAMESPACE=namespace boost { namespace process { namespace v2 { \" \\
+    \"BOOST_PROCESS_V2_END_NAMESPACE= } } }\" \\
+    BOOST_PROCESS_V2_NAMESPACE=boost::process::v2 \\
+    BOOST_PROCESS_V2_DECL \\
+    BOOST_PROCESS_V2_SOURCE \\
+    BOOST_PROCESS_V2_INITFN_AUTO_RESULT_TYPE(x,y)=deduced \\
+    BOOST_PROCESS_V2_COMPLETION_TOKEN_FOR(X)=Token \\
+    BOOST_PROCESS_V2_DEFAULT_COMPLETION_TOKEN_TYPE(E)=DEFAULT_TYPE \\
+    BOOST_ASIO_DEFAULT_COMPLETION_TOKEN=DEFAULT \\ 
+    BOOST_CONSTEXPR=constexpr \\
+    BOOST_CXX14_CONSTEXPR=constexpr \\
+    BOOST_ATTRIBUTE_NODISCARD=[[nodiscard]]
+    "
+  <doxygen.doxproc.id>reference_v2
+  <doxygen:param>SHOW_USED_FILES=NO
+  <doxygen:param>SHOW_FILES=NO
+  <doxygen:param>SHOW_NAMESPACES=YES
+  <doxygen:param>CLASS_DIAGRAMS=NO
+  <doxygen:param>SORT_MEMBERS_CTORS_1ST=YES
+  <doxygen:param>HIDE_UNDOC_CLASSES=NO
+  <xsl:path>.
+;
+
+
 boostbook standalone
 :
   process.qbk
 :
   <dependency>autodoc
+  <dependency>reference_v2
   <dependency>images
   <dependency>images_glob
   <xsl:param>boost.root=../../../..

doc/acknowledgements.qbk

@@ -8,4 +8,6 @@ A special thank you goes to [@http://www.intra2net.com/ Intra2net AG] (especiall
 
 Great thanks also goes to Boris Schaeling, who despite having boost.process rejected, went on to work on it and maintained it up until this day and participated in the development of the current version.
 
+Many Thanks, to [@https://github.com/time-killer-games Samuel Venable] for contributing the v2::ext functionality and all the research that went into it.
+
 [endsect]

doc/concepts.qbk

@@ -35,13 +35,13 @@ In this library the following functions are used for the creation of unnamed pip
 As the name suggests, named pipes have a string identifier. This means that a 
 handle to them can be obtained with the identifier, too.
 
-The implementation on posix uses [@(http://pubs.opengroup.org/onlinepubs/009695399/functions/mkfifo.html fifos],
+The implementation on posix uses [@http://pubs.opengroup.org/onlinepubs/009695399/functions/mkfifo.html fifos],
 which means, that the named pipe behaves like a file.
 
 Windows does provide a facility called [@https://msdn.microsoft.com/en-us/library/windows/desktop/aa365150(v=vs.85).aspx named pipes],
 which also have file-like names, but are in a different scope than the actual file system.
 
-[note The main reason named pipes are part of this library, is because they need to be internally used for asynchrounous communication on windows.]
+[note The main reason named pipes are part of this library, is because they need to be internally used for asynchronous communication on windows.]
 
 [endsect]
 

doc/design.qbk

@@ -83,7 +83,7 @@ will be called on the respective events on process launching. The names are:
 As an example:
 
 ```
-child c("ls", on_setup([](){cout << "On Setup" << endl;});
+child c("ls", on_setup([](){cout << "On Setup" << endl;}));
 ```
 
 

doc/posix_pseudocode.xml

@@ -31,7 +31,7 @@ else if (pid == 0) //child process
     for (auto & s : seq)
         s.<methodname alt="boost::process::extend::handler::on_exec_error">on_exec_error</methodname>(*this);
 
-    <emphasis>unspecified();</emphasis>//here the error is send to the father process interally
+    <emphasis>unspecified();</emphasis>//here the error is sent to the father process internally
 
     <ulink url="http://en.cppreference.com/w/cpp/utility/program/exit">std::exit</ulink>(<ulink url="http://en.cppreference.com/w/c/program/EXIT_status">EXIT_FAILURE</ulink>);
     return <classname alt="boost::process::child">child</classname>(); //for C++ compliance
@@ -39,7 +39,7 @@ else if (pid == 0) //child process
 
 <classname alt="boost::process::child">child</classname> c(pid, exit_code);
 
-<emphasis>unspecified();</emphasis>//here, we read the the error from the child process
+<emphasis>unspecified();</emphasis>//here, we read the error from the child process
 
 if (<methodname alt="boost::process::extend::posix_executor::error">error</methodname>())
     for (auto &amp; s : seq)
@@ -48,7 +48,7 @@ else
     for (auto &amp; s : seq)
         s.<methodname alt="boost::process::extend::handler::on_error">on_success</methodname>(*this);
 
-//now we check again, because a on_success handler might've errored.
+//now we check again, because an on_success handler might've errored.
 if (<methodname alt="boost::process::extend::posix_executor::error">error</methodname>())
 {
     for (auto &amp; s : seq)

doc/process.qbk

@@ -11,6 +11,8 @@
     ]
 ]
 
+[note [link process.v2 Process V2] is available as  experimental]
+
 [include introduction.qbk]
 [include concepts.qbk]
 [include tutorial.qbk]
@@ -19,3 +21,4 @@
 [include faq.qbk]
 [xinclude autodoc.xml]
 [include acknowledgements.qbk]
+[include v2.qbk]

doc/tutorial.qbk

@@ -82,10 +82,10 @@ int result = bp::system("/usr/bin/g++", "main.cpp");
 ```
 
 With that syntax we still have "g++" hard-coded, so let's assume we get the string
-from an external source as `boost::filesystem::path`, we can do this too.
+from an external source as `boost::process::filesystem::path`, we can do this too.
 
 ```
-boost::filesystem::path p = "/usr/bin/g++"; //or get it from somewhere else.
+boost::process::filesystem::path p = "/usr/bin/g++"; //or get it from somewhere else.
 int result = bp::system(p, "main.cpp");
 ```
 
@@ -93,7 +93,7 @@ Now we might want to find the `g++` executable in the `PATH`-variable, as the `c
 `Boost.process` provides a function to this end: bp::search_path.
 
 ```
-boost::filesystem::path p = bp::search_path("g++"); //or get it from somewhere else.
+boost::process::filesystem::path p = bp::search_path("g++"); //or get it from somewhere else.
 int result = bp::system(p, "main.cpp");
 ```
 
@@ -348,7 +348,7 @@ and use the following code, the `gcc` process will still run afterwards:
 
 ```
 bp::child c("make");
-if (!c.child_wait_for(std::chrono::seconds(10)) //give it 10 seconds
+if (!c.child_wait_for(std::chrono::seconds(10))) //give it 10 seconds
     c.child_terminate(); //then terminate
 ```
 
@@ -357,7 +357,7 @@ So in order to also terminate `gcc` we can use a group.
 ```
 bp::group g;
 bp::child c("make", g);
-if (!g.group_wait_for(std::chrono::seconds(10))
+if (!g.group_wait_for(std::chrono::seconds(10)))
     g.group_terminate();
     
 c.child_wait(); //to avoid a zombie process & get the exit code

doc/v2.qbk

@@ -0,0 +1,11 @@
+[section:v2 Process V2]
+
+[include v2/introduction.qbk]
+[include v2/quickstart.qbk]
+[include v2/launcher.qbk]
+[include v2/start_dir.qbk]
+[include v2/stdio.qbk]
+[include v2/env.qbk]
+[xinclude reference_v2.xml]
+
+[endsect]

doc/v2/env.qbk

@@ -0,0 +1,48 @@
+[section:env Environment]
+
+The `environment` namespace provides all sorts of facilities to query and manipulate the environment of the current process.
+
+The api should be straight forward, but one oddity that needs to be pointed out is, that environment names
+are not case sensitive on windows. The key_traits class implements the proper traits depending on the current system.
+
+Additionally, environment can be lists separated by `:` or `;`; `environment::value` and
+`environment::value_view` can be used to iterate those.
+
+Beyond that, the requirements on an environment are a low as possible; 
+an environment is either a list of strings or a list of string-pairs. It is however recommended to use the environment types,
+as to have the right value comparisons.
+
+To note is the `find_executable` functions, which searches in an environment for an executable.
+
+```
+    // search in the current environment
+    auto exe = environment::find_executable("g++");
+
+    std::unordered_map<environment::key, environment::value> my_env =
+        {
+            {"SECRET", "THIS_IS_A_TEST"},
+            {"PATH", {"/bin", "/usr/bin"}}
+        };
+
+    auto other_exe = environment::find_executable("g++", my_env);
+```
+
+[section:process_env Subprocess environment]
+
+The subprocess environment assignment follows the same constraints:
+
+```
+    asio::io_context ctx;
+    std::unordered_map<environment::key, environment::value> my_env =
+        {
+            {"SECRET", "THIS_IS_A_TEST"},
+            {"PATH", {"/bin", "/usr/bin"}}
+        };
+    auto exe = find_executable("g++");
+    process proc(ctx, exe, {"main.cpp"}, process_environment(my_env));
+    process pro2(ctx, exe, {"test.cpp"}, process_environment(my_env));
+```
+
+[endsect]
+
+[endsect]

doc/v2/introduction.qbk

@@ -0,0 +1,94 @@
+[section:introduction Introduction]
+
+Boost.process V2 is an redesign of boost.process, based on previous 
+design mistakes & improved system APIs.
+
+The major changes are
+
+* Simplified interface
+* Reliance on pidfd_open on linux
+* Full asio integration
+* Removed unreliable functionality
+* UTF8 Support
+* separate compilation
+* fd safe by default
+
+[section:simplified Simplified Interface]
+
+In process v1 one can define partial settings in the constructor of the process, 
+which has lead to a small DSL.
+
+ child c{exe="test", args+="--help", std_in < null(), env["FOO"] += "BAR"};
+
+While this looks fancy at first, it really does not scale well with more parameters.
+For process v2, the interfaces is simple: 
+
+ extern std::unordered_map<std::string, std::string> my_env;
+ extern asio::io_context ctx;
+ process proc(ctx, "./test", {"--help"}, process_io{nullptr, {}, {}}, process_environment(my_env));
+
+Every initializer addresses one logical component (e.g. stdio) instead of multiple ones accumulating.
+Furthermore, every process has a path and arguments, instead of a confusing mixture of cmd-style and 
+exe-args that can be randomly spread out.
+
+[endsect]
+
+[section:pidfd_open pidfd_open]
+
+Since process v1 came out, linux has moved along and added pidfd_open which allows users to get a 
+file descriptor for a process. This is much more reliable since it is not as easy to miss as a `SIGCHLD`.
+FreeBSD has a similar feature with `pdfork` which is also supported, while windows has provided `HANDLE`s 
+for processes all along.
+Unless the OS doesn't support it, process v2 will use file descriptors and handles to implement waiting 
+for processes.
+
+[endsect]
+
+[section:asio Full asio integration]
+
+Process v1 aimed to make asio optional, but synchronous IO with subprocesses usually means one is begging 
+for deadlocks.
+Since asio added pipes in boost 1.78, boost process V2 is fully asio based and uses it's pipes and 
+file-handles for the subprocess.
+
+[endsect]
+
+[section:unreliable Unreliable functionality]
+
+Certain parts of boost.process were not as reliable as they should've been. 
+
+This concerns especially the `wait_for` and `wait_until` functions on the process.
+The latter are easy to do on windows, but posix does not provide an API for this. 
+Thus the wait_for used signals or fork, which was all but safe. 
+Since process v2 is based on asio and thus supports cancellation, 
+a wait_for can not safely be implemented with an async_wait + timeout.
+
+[endsect]
+
+[section:utf8 UTF-8]
+
+["UTF-8 or GTFO]--Vinnie Falco
+
+Instead of using ascii-APIs on windows, process V2 just assumes UTF-8 everywhere.
+
+[endsect]
+
+[section:src Separate compilation]
+
+Boost.process v2 supports separate compilation similar to other boost libraries. 
+It can be achieved by defining `BOOST_PROCESS_V2_SEPARATE_COMPILATION` and including 
+`<process/v2/src.hpp>` in a single compile unit.
+
+[endsect]
+
+[section:limit_fd Fd safe by default]
+
+While not a problem on windows (since HANDLEs get manually enabled for inheritance),
+posix systems create a problem with inheriting file handles by default.
+
+Process V2 will automatically close all non-whitelisted descriptors, 
+without needing any option to enable it.
+
+[endsect]
+
+[endsect]

doc/v2/launcher.qbk

@@ -0,0 +1,128 @@
+[section:launchers Launcher]
+
+The process creation is done by a process_launcher. 
+The constructor of `process` will use the default_launcher, which varies by system.
+There are additional launcher available on most systems.
+
+[table:launchers Launcher overview
+    [[Name]                           [Summary] [Default on] [Available on]]
+    [[`windows::default_launcher`]    [Launcher using `CreateProcessW`]   [windows] [windows]]
+    [[`windows::as_user_launcher`]    [Launcher using `CreateProcessAsUserW`]    [] [windows]]
+    [[`windows::with_logon_launcher`] [Launcher using `CreateProcessWithLogonW`] [] [windows]]
+    [[`windows::with_token_launcher`] [Launcher using `CreateProcessWithTokenW`] [] [windows]]
+    [[`posix::default_launcher`]      [Launcher using fork & an error pipe] [most of posix]  [posix]]
+    [[`posix::fork_and_forget`]       [Launcher using fork without error pipe] []            [posix]]
+    [[`posix::pdfork_launcher`]       [Launcher using pdfork with an error pipe] [FreeBSD] [FreeBSD]]
+    [[`posix::vfork_launcher`]        [Launcher using vfork] [] [posix]]
+]
+
+A launcher is invoked through the call operator.
+
+```
+    auto l = windows::as_user_launcher((HANDLE)0xDEADBEEF);
+    asio::io_context ctx;
+    boost::system::error_code ec;
+    auto proc = l(ctx, ec, "C:\\User\\boost\\Downloads\\totally_not_a_virus.exe", {});
+```
+
+The launcher will call certain functions on the initializer if they're present, as documented below.
+The initializer are used to modify the process behaviour.
+
+[section:linux Linux Launchers]
+
+The default and pdfork launchers on linux open an internal pipe to communicate errors that occur after forking back to the parent process.
+
+This can be prevented by using the `fork_and_forget_launcher`. 
+Alternatively, the `vfork_launcher` can report errors directly back to the parent process.
+
+Thus some calls to the initializers occur after forking from the child process.
+
+```
+    struct custom_initializer
+    {
+        // functions called from the parent process:
+
+
+        // called before a call to fork. A returned error will cancel the launch.
+        template<typename Launcher>
+        error_code on_setup(Launcher & launcher, const filesystem::path &executable, const char * const * (&cmd_line));
+
+        // called for every initializer if an error occurred during setup or process creation
+        template<typename Launcher>
+        void on_error(Launcher & launcher, const filesystem::path &executable, const char * const * (&cmd_line),
+                      const error_code & ec);
+
+        // called after successful process creation
+        template<typename Launcher>
+        void on_success(Launcher & launcher, const filesystem::path &executable, const char * const * (&cmd_line));
+
+        // called for every initializer if an error occurred when forking, in addition to on_error.
+        template<typename Launcher>
+        void on_fork_error(Launcher & launcher, const filesystem::path &executable, const char * const * (&cmd_line),
+                           const error_code & ec);
+
+
+        // called before a call to execve. A returned error will cancel the launch. Called from the child process.
+        template<typename Launcher>
+        error_code on_exec_setup(Launcher & launcher, const filesystem::path &executable, const char * const * (&cmd_line));
+
+
+        // called after a failed call to execve from the child process.
+        template<typename Launcher>
+        void on_exec_error(Launcher & launcher, const filesystem::path &executable, const char * const * (&cmd_line));
+    };
+```
+
+The call sequence on success:
+'''
+<imagedata fileref="boost_process/posix_success.svg"/>
+'''
+
+The call sequence when fork fails:
+'''
+<imagedata fileref="boost_process/posix_fork_err.svg"/>
+'''
+
+The call sequence when exec fails:
+'''
+<imagedata fileref="boost_process/posix_exec_err.svg"/>
+'''
+
+The launcher will close all non-whitelisted file descriptors after `on_exec_setup`.
+
+[endsect]
+
+[section:windows Windows Launchers]
+
+Windows launchers are pretty straight forward, they will call the following functions on the initializer if present.
+
+```
+    struct custom_initializer
+    {
+        // called before a call to CreateProcess. A returned error will cancel the launch.
+        template<typename Launcher>
+        error_code on_setup(Launcher & launcher, const filesystem::path &executable, std::wstring &cmd_line);
+
+        // called for every initializer if an error occurred during setup or process creation
+        template<typename Launcher>
+        void on_error(Launcher & launcher, const filesystem::path &executable, std::wstring &cmd_line,
+                      const error_code & ec);
+
+        // called after successful process creation
+        template<typename Launcher>
+        void on_success(Launcher & launcher, const filesystem::path &executable, std::wstring &cmd_line);
+
+    };
+```
+
+[note All the additional launchers for windows inherit `default_launcher`]
+
+The call sequence is as follows:
+'''
+<imagedata fileref="boost_process/windows_exec.svg"/>
+'''
+
+[endsect]
+
+
+[endsect]

doc/v2/quickstart.qbk

@@ -0,0 +1,123 @@
+[section:quickstart Quickstart]
+
+A process needs four things to be launched:
+
+* an asio execution_context / executor 
+* a path to an executable
+* a list of arguments
+* a variadic set of initializers
+
+```
+     // process(asio::any_io_executor, filesystem::path, range<string> args, AdditionalInitializers...)
+    asio::io_context ctx;
+    process proc(ctx, "/usr/bin/cp", {"source.txt", "target.txt"});
+```
+ 
+
+The started process can then be awaited or terminated.
+
+[section:lifetime Lifetime]
+
+If the process handle goes out of scope, it will terminate the subprocess.
+You can prevent this, by calling `proc.detach()`; do however note that this 
+can lead to zombie processes.
+
+A process that completed will deliver an exit-code, 
+which can be obtained by calling `.exit_code` on the exited process and which is
+also returned from `.wait()`.
+
+```
+ process proc("/bin/ls", {});
+ assert(proc.wait() == 0);
+```
+
+The normal exit-code is what the subprocess returned from `main`;
+posix will however add additional information about the process.
+This is called the `native_exit_code`.
+
+
+The `.running()` function can be used to detect if the process is still active.
+
+[endsect]
+
+[section:signal Signalling the subprocess]
+
+The parent process can signal the subprocess demanding certain actions.
+
+`.terminate` will cause the subprocess to exit immediately (`SIGKILL` on posix).
+This is the only reliable & portable way to end a subprocess.
+
+```
+    process proc("/bin/totally-not-a-virus", {});
+    proc.terminate();
+```
+
+`.request_exit` will ask the subprocess to shutdown (`SIGTERM` on posix),
+which the subprocess might ignore.
+
+```
+    process proc("/bin/bash", {});
+    proc.request_exit();
+    proc.wait();
+```
+
+`.interrupt` will send an SIGINT to the subprocess, which a subprocess might 
+interpret as a signal to shutdown.
+
+[warning interrupt requires the initializer `windows::create_new_process_group` to be set]
+
+```
+    process proc("/usr/bin/addr2line", {});
+    proc.request_exit();
+    proc.wait();
+```
+
+[endsect]
+
+[section:execute Execute functions]
+
+Process v2 provides  `execute` and `async_execute` functions that can be used for managed executions.
+
+```
+ assert(execute(process("/bin/ls", {}) == 0));
+```
+
+The async version supports cancellation and will forward cancellation types as follows:
+
+- asio::cancellation_type::total    -> interrupt
+- asio::cancellation_type::partial  -> request_exit
+- asio::cancellation_type::terminal -> terminate
+
+```
+    asio::io_context ctx;
+    asio::steady_timer timeout{ctx, std::chrono::seconds(10)};
+
+    asio::cancellation_signal sig;
+    async_execute(process("/usr/bin/g++", {"hello_world.cpp"}), 
+                 asio::bind_cancellation_slot(sig.slot(), 
+                                              [&](error_code ec, int exit_code)
+                                              {
+                                                  timeout.cancel(); // we're done earlier
+                                              }));
+
+    timeout.async_wait(
+        [&](error_code ec) 
+        {
+            if (ec) // we were cancelled, do nothing
+                return ;
+            sig.emit(asio::cancellation_type::partial); 
+            // request exit first, but terminate after another 10 sec
+            timeout.expires_after(std::chrono::seconds(10));
+            timeout.async_wait(
+                [&](error_code ec)
+                {
+                    if (!ec)
+                        sig.emit(asio::cancellation_type::terminal); 
+                });
+        });
+
+```
+
+[endsect]
+
+[endsect]

doc/v2/start_dir.qbk

@@ -0,0 +1,16 @@
+[section:start_dir process_start_dir]
+
+The easier initializer to use is `process_start_dir`:
+
+```
+    asio::io_context ctx;
+    process ls(ctx, "/ls", {}, process_start_dir("/home"));
+    ls.wait();
+```
+
+This will run `ls` in the folder `/home` instead of the current folder.
+
+[warning If your path is relative, it may fail on posix, because the directory is changed before a call to execve.]
+
+
+[endsect]

doc/v2/stdio.qbk

@@ -0,0 +1,89 @@
+[section:stdio stdio]
+
+When using io with a subprocess, all three standard streams (stdin, stdout, stderr) get set for the child-process.
+The default setting is to inherit the parent process.
+
+This feature meant to be flexible, which is why there is little checking on the arguments assigned to one of those streams. 
+
+[section:pipe Pipe]
+
+asio pipes can be used for io. When using in process_stdio they will get 
+automatically connected and the other side will get assigned to the child process:
+
+```
+    asio::io_context ctx;
+    asio::readable_pipe rp;
+
+    process proc(ctx, "/usr/bin/g++", {"--version"}, process_stdio{{ /* in to default */}, rp, { /* err to default */ }});
+    std::string output;
+
+    system::error_code ec;
+    rp.read(asio::dynamic_buffer(output), ec);
+    assert(ec == asio::eof);
+    proc.wait();
+```
+
+readable pipes can be assigned to `out` an `err`, while writable_pipes can be assigned to `in`.
+
+[endsect]
+
+[section:file `FILE*`]
+
+`FILE*` can also be used for either side; this allows the `stdin`, `stderr`, `stdout` macros to be used:
+
+```
+    asio::io_context ctx;
+    // forward both stderr & stdout to stdout of the parent process
+    process proc(ctx, "/usr/bin/g++", {"--version"}, process_stdio{{ /* in to default */}, stdout, stdout});
+    proc.wait();
+```
+
+[endsect]
+
+[section:null `nullptr`]
+
+`nullptr` may be used to set a given stream to be opened on the null-device (`/dev/null` on posix, `NUL` on windows). 
+This is used to ignore output or give only EOF as input.
+
+```
+    asio::io_context ctx;
+    // ignore stderr
+    process proc(ctx, "/usr/bin/g++", {"--version"}, process_stdio{{ /* in to default */}, {}, nullptr});
+    proc.wait();
+```
+
+[endsect]
+
+
+[section:native_handle `native_handle`]
+
+A native handle can be used as well, which means an `int` on posix or a `HANDLE` on windows. 
+Furthermore, any object that has a `native_handle` returning that native handle type is valid, too.
+
+
+```
+    asio::io_context ctx;
+    // ignore stderr
+    asio::ip::tcp::socket sock{ctx};
+    connect_my_socket(sock);
+    process proc(ctx, "~/not-a-virus", {}, process_stdio{sock, sock, nullptr});
+    proc.wait();
+```
+
+[endsect]
+
+[section:popen popen]
+
+Additionally, process v2 provides a `popen` class. 
+It starts a process and connects pipes for stdin and stdout, so that the popen object can be used as a stream.
+
+```
+   popen proc(executor, "/usr/bin/addr2line, {argv[0]});
+   asio::write(proc, asio::buffer("main\n"));
+   std::string line;
+   asio::read_until(proc, asio::dynamic_buffer(line), '\n');
+```
+
+[endsect]
+
+[endsect]

doc/windows_pseudocode.xml

@@ -29,7 +29,7 @@ else
     for (auto & s : seq)
         s.<methodname alt="boost::process::extend::handler::on_error">on_success</methodname>(*this);
 
-//now we check again, because a on_success handler might've errored.
+//now we check again, because an on_success handler might've errored.
 if (<methodname alt="boost::process::extend::windows_executor::error">error</methodname>())
 {
     for (auto &amp; s : seq)

example/io.cpp

@@ -22,7 +22,7 @@ int main()
         bp::std_in < bp::null //null in
     );
 
-    boost::filesystem::path p = "input.txt";
+    boost::process::filesystem::path p = "input.txt";
 
     bp::system(
         "test.exe",

example/start_dir.cpp

@@ -8,7 +8,7 @@
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
 #include <boost/process.hpp>
-#include <boost/filesystem.hpp>
+#include <boost/process/filesystem.hpp>
 
 namespace bp = boost::process;
 
@@ -19,9 +19,9 @@ int main()
         bp::start_dir="../foo"
     );
 
-    boost::filesystem::path exe = "test.exe";
+    boost::process::filesystem::path exe = "test.exe";
     bp::system(
-        boost::filesystem::absolute(exe),
+        boost::process::filesystem::absolute(exe),
         bp::start_dir="../foo"
     );
 }

example/v2/Jamfile.jam

@@ -0,0 +1,17 @@
+# Copyright (c) 2022 Klemens Morgenstern
+#
+# Distributed under the Boost Software License, Version 1.0. (See accompanying
+# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+project : requirements
+  <include>../../..
+  <toolset>msvc:<define>_SCL_SECURE_NO_WARNINGS
+  <target-os>windows:<define>WIN32_LEAN_AND_MEAN
+;
+
+import testing ;
+
+alias filesystem   : /boost//filesystem : <link>static ;
+
+exe intro : intro.cpp filesystem ;
+exe intro_popen : intro_popen.cpp filesystem ;

example/v2/intro.cpp

@@ -0,0 +1,39 @@
+// Copyright (c) 2022 Klemens Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//[intro
+#include <boost/process/v2.hpp>
+
+#include <boost/asio/read.hpp>
+#include <boost/asio/readable_pipe.hpp>
+#include <boost/system/error_code.hpp>
+
+#include <string>
+#include <iostream>
+
+namespace proc   = boost::process::v2;
+namespace asio   = boost::asio;
+
+
+int main()
+{
+    asio::io_context ctx;
+    asio::readable_pipe p{ctx};
+
+    const auto exe = proc::environment::find_executable("gcc");
+
+    proc::process c{ctx, exe, {"--version"}, proc::process_stdio{nullptr, p}};
+
+    std::string line;
+    boost::system::error_code ec;
+
+    auto sz = asio::read(p, asio::dynamic_buffer(line), ec);
+    assert(ec == asio::error::eof);
+
+    std::cout << "Gcc version: '"  << line << "'" << std::endl;
+
+    c.wait();
+}
+//]

example/v2/intro_popen.cpp

@@ -0,0 +1,36 @@
+// Copyright (c) 2022Klemens Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//[intro
+#include <boost/process/v2.hpp>
+
+#include <boost/asio/read.hpp>
+#include <boost/asio/readable_pipe.hpp>
+#include <boost/system/error_code.hpp>
+
+#include <string>
+#include <iostream>
+
+namespace proc   = boost::process::v2;
+namespace asio   = boost::asio;
+
+
+int main()
+{
+    asio::io_context ctx;
+    const auto exe = proc::environment::find_executable("gcc");
+    proc::popen c{ctx, exe, {"--version"}};
+
+    std::string line;
+    boost::system::error_code ec;
+
+    auto sz = asio::read(c, asio::dynamic_buffer(line), ec);
+    assert(ec == asio::error::eof);
+
+    std::cout << "Gcc version: '"  << line << "'" << std::endl;
+
+    c.wait();
+}
+//]

example/windows.cpp

@@ -8,6 +8,7 @@
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
 #include <boost/process.hpp>
+#include <boost/process/extend.hpp>
 #include <boost/process/windows.hpp>
 #include <iostream>
 
@@ -22,9 +23,9 @@ int main()
 
 
     bp::system("test.exe",
-        bp::on_setup([](auto &e)
+        bp::extend::on_setup([](auto &e)
             { e.startup_info.dwFlags = STARTF_RUNFULLSCREEN; }),
-        bp::on_error([](auto&, const std::error_code & ec)
+        bp::extend::on_error([](auto&, const std::error_code & ec)
             { std::cerr << ec.message() << std::endl; })
         );
 }

include/boost/process/async.hpp

@@ -5,7 +5,7 @@
 
 /** \file boost/process/async.hpp
 
-The header which provides the basic asynchrounous features.
+The header which provides the basic asynchronous features.
 It provides the on_exit property, which allows callbacks when the process exits.
 It also implements the necessary traits for passing an boost::asio::io_context,
 which is needed for asynchronous communication.

include/boost/process/async_pipe.hpp

@@ -26,7 +26,7 @@ namespace boost { namespace process {
 #if defined(BOOST_PROCESS_DOXYGEN)
 
 
-/** Class implementing and asnychronous I/O-Object for use with boost.asio.
+/** Class implementing an asnychronous I/O-Object for use with boost.asio.
  *  It is based on the corresponding I/O Object, that is either boost::asio::windows::stream_handle or
  *  boost::asio::posix::stream_descriptor.
  *

include/boost/process/async_system.hpp

@@ -11,7 +11,7 @@
 /**
  * \file boost/process/async_system.hpp
  *
- * Defines the asynchrounous version of the system function.
+ * Defines the asynchronous version of the system function.
  */
 
 #ifndef BOOST_PROCESS_ASYNC_SYSTEM_HPP
@@ -38,12 +38,11 @@ namespace process {
 namespace detail
 {
 
-template<typename ExitHandler>
+template<typename Handler>
 struct async_system_handler : ::boost::process::detail::api::async_handler
 {
     boost::asio::io_context & ios;
-    boost::asio::async_completion<
-            ExitHandler, void(boost::system::error_code, int)> init;
+    Handler handler;
 
 #if defined(BOOST_POSIX_API)
     bool errored = false;
@@ -52,9 +51,8 @@ struct async_system_handler : ::boost::process::detail::api::async_handler
     template<typename ExitHandler_>
     async_system_handler(
             boost::asio::io_context & ios,
-            ExitHandler_ && exit_handler) : ios(ios), init(exit_handler)
+            ExitHandler_ && exit_handler) : ios(ios), handler(std::forward<ExitHandler_>(exit_handler))
     {
-
     }
 
 
@@ -64,21 +62,15 @@ struct async_system_handler : ::boost::process::detail::api::async_handler
 #if defined(BOOST_POSIX_API)
         errored = true;
 #endif
-        auto & h = init.completion_handler;
+        auto h = std::make_shared<Handler>(std::move(handler));
         boost::asio::post(
             ios.get_executor(),
             [h, ec]() mutable
             {
-                h(boost::system::error_code(ec.value(), boost::system::system_category()), -1);
+                (*h)(boost::system::error_code(ec.value(), boost::system::system_category()), -1);
             });
     }
 
-    BOOST_ASIO_INITFN_RESULT_TYPE(ExitHandler, void (boost::system::error_code, int))
-        get_result()
-    {
-        return init.result.get();
-    }
-
     template<typename Executor>
     std::function<void(int, const std::error_code&)> on_exit_handler(Executor&)
     {
@@ -86,10 +78,10 @@ struct async_system_handler : ::boost::process::detail::api::async_handler
         if (errored)
             return [](int , const std::error_code &){};
 #endif
-        auto & h = init.completion_handler;
+        auto h = std::make_shared<Handler>(std::move(handler));
         return [h](int exit_code, const std::error_code & ec) mutable
                {
-                    h(boost::system::error_code(ec.value(), boost::system::system_category()), exit_code);
+                    (*h)(boost::system::error_code(ec.value(), boost::system::system_category()), exit_code);
                };
     }
 };
@@ -120,21 +112,36 @@ inline boost::process::detail::dummy
     async_system(boost::asio::io_context & ios, ExitHandler && exit_handler, Args && ...args);
 #endif
 
+namespace detail
+{
+struct async_system_init_op
+{
+
+    template<typename Handler, typename ... Args>
+    void operator()(Handler && handler, asio::io_context & ios, Args && ... args)
+    {
+        detail::async_system_handler<typename std::decay<Handler>::type> async_h{ios, std::forward<Handler>(handler)};
+        child(ios, std::forward<Args>(args)..., async_h ).detach();
+    }
+};
+
+
+}
+
+
 template<typename ExitHandler, typename ...Args>
 inline BOOST_ASIO_INITFN_RESULT_TYPE(ExitHandler, void (boost::system::error_code, int))
     async_system(boost::asio::io_context & ios, ExitHandler && exit_handler, Args && ...args)
 {
-    detail::async_system_handler<ExitHandler> async_h{ios, std::forward<ExitHandler>(exit_handler)};
-
+    
     typedef typename ::boost::process::detail::has_error_handler<boost::fusion::tuple<Args...>>::type
             has_err_handling;
 
     static_assert(!has_err_handling::value, "async_system cannot have custom error handling");
 
-
-    child(ios, std::forward<Args>(args)..., async_h ).detach();
-
-    return async_h.get_result();
+    return boost::asio::async_initiate<ExitHandler, void (boost::system::error_code, int)>(
+        detail::async_system_init_op{}, exit_handler, ios, std::forward<Args>(args)...
+    );
 }
 
 

include/boost/process/detail/basic_cmd.hpp

@@ -168,7 +168,7 @@ struct exe_builder
     string_type exe;
     std::vector<string_type> args;
 
-    void operator()(const boost::filesystem::path & data)
+    void operator()(const boost::process::filesystem::path & data)
     {
         not_cmd = true;
         if (exe.empty())

include/boost/process/detail/child_decl.hpp

@@ -125,7 +125,10 @@ public:
         boost::process::detail::throw_error(ec, "wait error");
     }
 
+#if !defined(BOOST_PROCESS_NO_DEPRECATED)
+
     template< class Rep, class Period >
+    BOOST_DEPRECATED("wait_for is unreliable")
     bool wait_for (const std::chrono::duration<Rep, Period>& rel_time)
     {
         std::error_code ec;
@@ -135,6 +138,7 @@ public:
     }
 
     template< class Clock, class Duration >
+    BOOST_DEPRECATED("wait_until is unreliable")
     bool wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time )
     {
         std::error_code ec;
@@ -142,6 +146,7 @@ public:
         boost::process::detail::throw_error(ec, "wait_until error");
         return b;
     }
+#endif
 
     bool running(std::error_code & ec) noexcept
     {
@@ -178,13 +183,16 @@ public:
         }
     }
 
+#if !defined(BOOST_PROCESS_NO_DEPRECATED)
     template< class Rep, class Period >
+    BOOST_DEPRECATED("wait_for is unreliable")
     bool wait_for (const std::chrono::duration<Rep, Period>& rel_time, std::error_code & ec) noexcept
     {
         return wait_until(std::chrono::steady_clock::now() + rel_time, ec);
     }
 
     template< class Clock, class Duration >
+    BOOST_DEPRECATED("wait_until is unreliable")
     bool wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time, std::error_code & ec) noexcept
     {
         if (!_exited())
@@ -197,7 +205,7 @@ public:
         }
         return true;
     }
-
+#endif
 
     bool valid() const
     {

include/boost/process/detail/config.hpp

@@ -21,7 +21,9 @@
 #include <system_error>
 #include <boost/system/api_config.hpp>
 
+#include <boost/throw_exception.hpp>
 #include <boost/process/exception.hpp>
+#include <boost/assert/source_location.hpp>
 
 #if defined(BOOST_POSIX_API)
 #include <errno.h>
@@ -71,31 +73,33 @@ inline std::error_code get_last_error() noexcept
 }
 #endif
 
-inline void throw_last_error(const std::string & msg)
+inline void throw_last_error(const std::string & msg, boost::source_location const & loc = boost::source_location())
 {
-    throw process_error(get_last_error(), msg);
+    boost::throw_exception(process_error(get_last_error(), msg), loc);
 }
 
-inline void throw_last_error(const char * msg)
+inline void throw_last_error(const char * msg, boost::source_location const & loc = boost::source_location())
 {
-    throw process_error(get_last_error(), msg);
+    boost::throw_exception(process_error(get_last_error(), msg), loc);
 }
 
-inline void throw_last_error()
+inline void throw_last_error(boost::source_location const & loc = boost::source_location())
 {
-    throw process_error(get_last_error());
+    boost::throw_exception(process_error(get_last_error()), loc);
 }
 
-inline void throw_error(const std::error_code& ec)
+inline void throw_error(const std::error_code& ec,
+                        boost::source_location const & loc = boost::source_location())
 {
     if (ec)
-        throw process_error(ec);
+        boost::throw_exception(process_error(ec), loc);
 }
 
-inline void throw_error(const std::error_code& ec, const char* msg)
+inline void throw_error(const std::error_code& ec, const char* msg,
+                        boost::source_location const & loc = boost::source_location())
 {
     if (ec)
-        throw process_error(ec, msg);
+        boost::throw_exception(process_error(ec, msg), loc);
 }
 
 template<typename Char> constexpr Char null_char();
@@ -114,6 +118,8 @@ template<typename Char> constexpr Char space_sign();
 template<> constexpr char     space_sign<char>    () {return  ' '; }
 template<> constexpr wchar_t  space_sign<wchar_t> () {return L' '; }
 
+}
+}
+}
 
-}}}
 #endif

include/boost/process/detail/posix/async_out.hpp

@@ -71,7 +71,7 @@ struct async_out_buffer : ::boost::process::detail::posix::handler_base_ext,
     }
 
     template <typename Executor>
-    inline void on_success(Executor &exec)
+    inline void on_success(Executor &)
     {
         auto  pipe              = this->pipe;
         boost::asio::async_read(*pipe, buf,

include/boost/process/detail/posix/basic_cmd.hpp

@@ -39,10 +39,10 @@ inline std::string build_cmd_shell(const std::string & exe, std::vector<std::str
             //the first one is put directly onto the output,
             //because then I don't have to copy the whole string
             arg.insert(arg.begin(), '"' );
-            arg += '"'; //thats the post one.
+            arg += '"'; //that is the post one.
         }
 
-        if (!st.empty())//first one does not need a preceeding space
+        if (!st.empty())//first one does not need a preceding space
             st += ' ';
 
         st += arg;
@@ -112,7 +112,10 @@ struct exe_cmd_init<char> : boost::process::detail::api::handler_base_ext
     {
         if (exe.empty()) //cmd style
         {
-            exec.exe = args.front().c_str();
+            if (args.empty())
+                exec.exe = "";
+            else
+                exec.exe = args.front().c_str();    
             exec.cmd_style = true;
         }
         else
@@ -139,7 +142,7 @@ struct exe_cmd_init<char> : boost::process::detail::api::handler_base_ext
     }
     static exe_cmd_init cmd_shell(std::string&& cmd)
     {
-        std::vector<std::string> args = {"-c", "\"" + cmd + "\""};
+        std::vector<std::string> args = {"-c", cmd};
         std::string sh = shell().string();
 
         return exe_cmd_init(
@@ -155,13 +158,15 @@ private:
 
 std::vector<char*> exe_cmd_init<char>::make_cmd()
 {
+    // any string must be writable.
+    static char empty_string[1] = "";
     std::vector<char*> vec;
     if (!exe.empty())
-        vec.push_back(&exe.front());
+        vec.push_back(exe.empty() ? empty_string : &exe.front());
 
     if (!args.empty()) {
         for (auto & v : args)
-            vec.push_back(&v.front());
+            vec.push_back(v.empty() ? empty_string : &v.front());
     }
 
     vec.push_back(nullptr);

include/boost/process/detail/posix/basic_pipe.hpp

@@ -11,7 +11,7 @@
 #define BOOST_PROCESS_POSIX_PIPE_HPP
 
 
-#include <boost/filesystem.hpp>
+#include <boost/process/filesystem.hpp>
 #include <boost/process/detail/posix/compare_handles.hpp>
 #include <system_error>
 #include <array>
@@ -77,12 +77,9 @@ public:
     void assign_source(native_handle_type h) { _source = h;}
     void assign_sink  (native_handle_type h) { _sink = h;}
 
-
-
-
     int_type write(const char_type * data, int_type count)
     {
-        int_type write_len;
+        ssize_t write_len;
         while ((write_len = ::write(_sink, data, count * sizeof(char_type))) == -1)
         {
             //Try again if interrupted
@@ -90,11 +87,11 @@ public:
             if (err != EINTR)
                 ::boost::process::detail::throw_last_error();
         }
-        return write_len;
+        return static_cast<int_type>(write_len);
     }
     int_type read(char_type * data, int_type count)
     {
-        int_type read_len;
+        ssize_t read_len;
         while ((read_len = ::read(_source, data, count * sizeof(char_type))) == -1)
         {
             //Try again if interrupted
@@ -102,7 +99,7 @@ public:
             if (err != EINTR)
                 ::boost::process::detail::throw_last_error();
         }
-        return read_len;
+        return static_cast<int_type>(read_len);
     }
 
     bool is_open() const

include/boost/process/detail/posix/executor.hpp

@@ -26,6 +26,8 @@
 #include <boost/algorithm/string/split.hpp>
 #include <boost/algorithm/string/classification.hpp>
 
+#include <boost/core/ignore_unused.hpp>
+
 namespace boost { namespace process { namespace detail { namespace posix {
 
 template<typename Executor>
@@ -149,14 +151,15 @@ class executor
 
     int _pipe_sink = -1;
 
+
     void write_error(const std::error_code & ec, const char * msg)
     {
         //I am the child
-        const auto len = std::strlen(msg);
+        const auto len = static_cast<int>(std::strlen(msg));
         int data[2] = {ec.value(), len + 1};
 
-        ::write(_pipe_sink, &data[0], sizeof(int) * 2);
-        ::write(_pipe_sink, msg, len);
+        boost::ignore_unused(::write(_pipe_sink, &data[0], sizeof(int) * 2));
+        boost::ignore_unused(::write(_pipe_sink, msg, len));
     }
 
     void internal_error_handle(const std::error_code &ec, const char* msg, boost::mpl::true_ , boost::mpl::false_, boost::mpl::false_)
@@ -259,7 +262,10 @@ class executor
                 return;
                 //EAGAIN not yet forked, EINTR interrupted, i.e. try again
             else if ((err != EAGAIN ) && (err != EINTR))
-                set_error(std::error_code(err, std::system_category()), "Error read pipe");
+            {
+              set_error(std::error_code(err, std::system_category()), "Error read pipe");
+              return;
+            }
         }
         set_error(ec, std::move(msg));
     }
@@ -321,10 +327,20 @@ public:
 
     void set_error(const std::error_code &ec, const char* msg)
     {
+        if (pid != 0 && pid != -1) // reap-zombie
+          ::waitpid(pid, nullptr, 0);
+
         internal_error_handle(ec, msg, has_error_handler(), has_ignore_error(), shall_use_vfork());
     }
     void set_error(const std::error_code &ec, const std::string &msg) {set_error(ec, msg.c_str());};
 
+    std::vector<int> get_used_handles() const 
+    {
+        if (_pipe_sink == -1)
+            return {};
+        else
+            return {_pipe_sink};
+    };
 };
 
 template<typename Sequence>
@@ -434,6 +450,7 @@ child executor<Sequence>::invoke(boost::mpl::false_, boost::mpl::false_)
     }
     if (_ec)
     {
+        //if an error occurred we need to reap the child process
         boost::fusion::for_each(seq, call_on_error(*this, _ec));
         return child();
     }
@@ -527,6 +544,7 @@ child executor<Sequence>::invoke(boost::mpl::false_, boost::mpl::true_)
 
     if (_ec)
     {
+        ::waitpid(this->pid, nullptr, WNOHANG);
         boost::fusion::for_each(seq, call_on_error(*this, _ec));
         return child();
     }

include/boost/process/detail/posix/file_descriptor.hpp

@@ -8,7 +8,8 @@
 
 #include <fcntl.h>
 #include <string>
-#include <boost/filesystem/path.hpp>
+#include <boost/process/filesystem.hpp>
+#include <boost/core/exchange.hpp>
 
 namespace boost { namespace process { namespace detail { namespace posix {
 
@@ -23,7 +24,7 @@ struct file_descriptor
 
 
     file_descriptor() = default;
-    explicit file_descriptor(const boost::filesystem::path& p, mode_t mode = read_write)
+    explicit file_descriptor(const boost::process::filesystem::path& p, mode_t mode = read_write)
         : file_descriptor(p.native(), mode)
     {
     }
@@ -39,10 +40,22 @@ struct file_descriptor
     }
 
     file_descriptor(const file_descriptor & ) = delete;
-    file_descriptor(file_descriptor && ) = default;
+    file_descriptor(file_descriptor &&other)
+        : _handle(boost::exchange(other._handle, -1))
+    {
+    }
 
     file_descriptor& operator=(const file_descriptor & ) = delete;
-    file_descriptor& operator=(file_descriptor && ) = default;
+    file_descriptor& operator=(file_descriptor &&other)
+    {
+        if (this != &other)
+        {
+            if (_handle != -1)
+                ::close(_handle);
+            _handle = boost::exchange(other._handle, -1);
+        }
+        return *this;
+    }
 
     ~file_descriptor()
     {

include/boost/process/detail/posix/handles.hpp

@@ -11,6 +11,8 @@
 #include <dirent.h>
 #include <sys/stat.h>
 #include <algorithm>
+#include <memory>
+#include <cstdlib>
 #include <boost/process/detail/posix/handler.hpp>
 
 namespace boost { namespace process { namespace detail { namespace posix {

include/boost/process/detail/posix/io_context_ref.hpp

@@ -80,7 +80,7 @@ struct io_context_ref : handler_base_ext
     void on_success(Executor& exec)
     {
         ios.notify_fork(boost::asio::io_context::fork_parent);
-        //must be on the heap so I can move it into the lambda.
+        //must be on the heap, so I can move it into the lambda.
         auto asyncs = boost::fusion::filter_if<
                         is_async_handler<
                         typename std::remove_reference< boost::mpl::_ > ::type

include/boost/process/detail/posix/is_running.hpp

@@ -34,7 +34,7 @@ inline bool is_running(const child_handle &p, int & exit_code, std::error_code &
 
     if (ret == -1)
     {
-        if (errno != ECHILD) //because it no child is running, than this one isn't either, obviously.
+        if (errno != ECHILD) //because it no child is running, then this one isn't either, obviously.
             ec = ::boost::process::detail::get_last_error();
         return false;
     }

include/boost/process/detail/posix/search_path.hpp

@@ -11,7 +11,7 @@
 #define BOOST_PROCESS_POSIX_SEARCH_PATH_HPP
 
 #include <boost/process/detail/config.hpp>
-#include <boost/filesystem.hpp>
+#include <boost/process/filesystem.hpp>
 #include <boost/tokenizer.hpp>
 #include <string>
 #include <stdexcept>
@@ -20,15 +20,19 @@
 
 namespace boost { namespace process { namespace detail { namespace posix {
 
-inline boost::filesystem::path search_path(
-        const boost::filesystem::path &filename,
-        const std::vector<boost::filesystem::path> &path)
+inline boost::process::filesystem::path search_path(
+        const boost::process::filesystem::path &filename,
+        const std::vector<boost::process::filesystem::path> &path)
 {
-    for (const boost::filesystem::path & pp : path)
+    for (const boost::process::filesystem::path & pp : path)
     {
         auto p = pp / filename;
+#if defined(BOOST_PROCESS_USE_STD_FS)
+        std::error_code ec;
+#else
         boost::system::error_code ec;
-        bool file = boost::filesystem::is_regular_file(p, ec);
+#endif
+        bool file = boost::process::filesystem::is_regular_file(p, ec);
         if (!ec && file && ::access(p.c_str(), X_OK) == 0)
             return p;
     }

include/boost/process/detail/posix/shell_path.hpp

@@ -12,16 +12,16 @@
 
 #include <boost/process/detail/config.hpp>
 #include <boost/system/error_code.hpp>
-#include <boost/filesystem/path.hpp>
+#include <boost/process/filesystem.hpp>
 
 namespace boost { namespace process { namespace detail { namespace posix {
 
-inline boost::filesystem::path shell_path()
+inline boost::process::filesystem::path shell_path()
 {
     return "/bin/sh";
 }
 
-inline boost::filesystem::path shell_path(std::error_code &ec)
+inline boost::process::filesystem::path shell_path(std::error_code &ec)
 {
     ec.clear();
     return "/bin/sh";

include/boost/process/detail/posix/sigchld_service.hpp

@@ -7,14 +7,18 @@
 #ifndef BOOST_PROCESS_DETAIL_POSIX_SIGCHLD_SERVICE_HPP_
 #define BOOST_PROCESS_DETAIL_POSIX_SIGCHLD_SERVICE_HPP_
 
+#include <boost/asio/bind_executor.hpp>
 #include <boost/asio/dispatch.hpp>
 #include <boost/asio/post.hpp>
+#include <boost/asio/consign.hpp>
+#include <boost/asio/append.hpp>
 #include <boost/asio/signal_set.hpp>
 #include <boost/asio/strand.hpp>
 #include <boost/optional.hpp>
 #include <signal.h>
 #include <functional>
 #include <sys/wait.h>
+#include <list>
 
 namespace boost { namespace process { namespace detail { namespace posix {
 
@@ -23,8 +27,45 @@ class sigchld_service : public boost::asio::detail::service_base<sigchld_service
     boost::asio::strand<boost::asio::io_context::executor_type> _strand{get_io_context().get_executor()};
     boost::asio::signal_set _signal_set{get_io_context(), SIGCHLD};
 
-    std::vector<std::pair<::pid_t, std::function<void(int, std::error_code)>>> _receivers;
+    std::list<std::pair<::pid_t, std::function<void(int, std::error_code)>>> _receivers;
     inline void _handle_signal(const boost::system::error_code & ec);
+
+    struct initiate_async_wait_op
+    {
+        sigchld_service * self;
+        template<typename Initiation>
+        void operator()(Initiation && init, ::pid_t pid)
+        {
+            // check if the child actually is running first
+            int status;
+            auto pid_res = ::waitpid(pid, &status, WNOHANG);
+            if (pid_res < 0)
+            {
+                auto ec = get_last_error();
+                boost::asio::post(
+                        self->_strand,
+                        asio::append(std::forward<Initiation>(init), pid_res, ec));
+            }
+            else if ((pid_res == pid) && (WIFEXITED(status) || WIFSIGNALED(status)))
+                boost::asio::post(
+                        self->_strand,
+                        boost::asio::append(std::forward<Initiation>(init), status, std::error_code{}));
+            else //still running
+            {
+                sigchld_service * self_ = self;
+                if (self->_receivers.empty())
+                    self->_signal_set.async_wait(
+                        boost::asio::bind_executor(
+                            self->_strand,
+                            [self_](const boost::system::error_code &ec, int)
+                            {
+                                self_->_handle_signal(ec);
+                            }));
+                self->_receivers.emplace_back(pid, init);
+            }
+        }
+    };
+
 public:
     sigchld_service(boost::asio::io_context & io_context)
         : boost::asio::detail::service_base<sigchld_service>(io_context)
@@ -36,47 +77,10 @@ public:
         void (int, std::error_code))
     async_wait(::pid_t pid, SignalHandler && handler)
     {
-        boost::asio::async_completion<
-        SignalHandler, void(boost::system::error_code)> init{handler};
-
-        auto & h = init.completion_handler;
-        boost::asio::dispatch(
-                _strand,
-                [this, pid, h]
-                {
-                    //check if the child actually is running first
-                    int status;
-                    auto pid_res = ::waitpid(pid, &status, WNOHANG);
-                    if (pid_res < 0)
-                    {
-                        auto ec = get_last_error();
-                        boost::asio::post(
-                                _strand,
-                                [pid_res, ec, h]
-                                {
-                                    h(pid_res, ec);
-                                });
-                    }
-                    else if ((pid_res == pid) && (WIFEXITED(status) || WIFSIGNALED(status)))
-                        boost::asio::post(
-                                _strand,
-                                [status, h]
-                                {
-                                    h(status, {}); //successfully exited already
-                                });
-                    else //still running
-                    {
-                        if (_receivers.empty())
-                            _signal_set.async_wait(
-                                    [this](const boost::system::error_code &ec, int)
-                                    {
-                                        boost::asio::dispatch(_strand, [this, ec]{this->_handle_signal(ec);});
-                                    });
-                        _receivers.emplace_back(pid, h);
-                    }
-                });
-
-        return init.result.get();
+        return boost::asio::async_initiate<
+            SignalHandler,
+            void(int, std::error_code)>(
+                initiate_async_wait_op{this}, handler, pid);
     }
     void shutdown() override
     {

include/boost/process/detail/posix/start_dir.hpp

@@ -13,6 +13,7 @@
 #include <boost/process/detail/posix/handler.hpp>
 #include <string>
 #include <unistd.h>
+#include <boost/core/ignore_unused.hpp>
 
 namespace boost { namespace process { namespace detail { namespace posix {
 
@@ -26,7 +27,7 @@ struct start_dir_init : handler_base_ext
     template <class PosixExecutor>
     void on_exec_setup(PosixExecutor&) const
     {
-        ::chdir(s_.c_str());
+        boost::ignore_unused(::chdir(s_.c_str()));
     }
     const string_type & str() const {return s_;}
 private:

include/boost/process/detail/traits/cmd_or_exe.hpp

@@ -11,7 +11,7 @@
 #include <vector>
 #include <type_traits>
 #include <initializer_list>
-#include <boost/filesystem/path.hpp>
+#include <boost/process/filesystem.hpp>
 #include <boost/process/detail/traits/decl.hpp>
 namespace boost { namespace process { namespace detail {
 
@@ -53,12 +53,12 @@ template<> struct initializer_tag<std::initializer_list<const wchar_t *>> { type
 
 template<> struct initializer_tag<shell_>
 {
-    typedef cmd_or_exe_tag<typename boost::filesystem::path::value_type> type;
+    typedef cmd_or_exe_tag<typename boost::process::filesystem::path::value_type> type;
 };
 
-template<> struct initializer_tag<boost::filesystem::path>
+template<> struct initializer_tag<boost::process::filesystem::path>
 {
-    typedef cmd_or_exe_tag<typename boost::filesystem::path::value_type> type;
+    typedef cmd_or_exe_tag<typename boost::process::filesystem::path::value_type> type;
 };
 
 template <typename Char>

include/boost/process/detail/traits/wchar_t.hpp

@@ -20,7 +20,7 @@ namespace boost { namespace process { namespace detail {
 
 template<typename T> struct is_wchar_t : std::false_type {};
 
-template<> struct is_wchar_t<boost::filesystem::path> : std::is_same<typename boost::filesystem::path::value_type, wchar_t>
+template<> struct is_wchar_t<boost::process::filesystem::path> : std::is_same<typename boost::process::filesystem::path::value_type, wchar_t>
 {
 };
 

include/boost/process/detail/used_handles.hpp

@@ -69,7 +69,7 @@ template<typename Executor>
 std::vector<::boost::process::detail::api::native_handle_type>
         get_used_handles(Executor &exec)
 {
-    std::vector<::boost::process::detail::api::native_handle_type> res;
+    std::vector<::boost::process::detail::api::native_handle_type> res = exec.get_used_handles();
     foreach_used_handle(exec, [&](::boost::process::detail::api::native_handle_type handle){res.push_back(handle);});
     return res;
 }

include/boost/process/detail/windows/basic_cmd.hpp

@@ -61,8 +61,12 @@ inline std::string build_args(const std::string & exe, std::vector<std::string>
                 arg += '"';
             }
         }
+        else
+        {
+            arg = "\"\"";
+        }
 
-        if (!st.empty())//first one does not need a preceeding space
+        if (!st.empty())//first one does not need a preceding space
             st += ' ';
 
         st += arg;
@@ -105,8 +109,12 @@ inline std::wstring build_args(const std::wstring & exe, std::vector<std::wstrin
                 arg += '"';
             }
         }
+        else
+        {
+            arg = L"\"\"";
+        }
 
-        if (!st.empty())//first one does not need a preceeding space
+        if (!st.empty())//first one does not need a preceding space
             st += L' ';
 
         st += arg;
@@ -159,8 +167,13 @@ struct exe_cmd_init : handler_base_ext
         return exe_cmd_init<Char>(std::move(sh), std::move(args_));
     }
 
+#ifdef BOOST_PROCESS_USE_STD_FS
+    static std:: string get_shell(char)    {return shell(). string(); }
+    static std::wstring get_shell(wchar_t) {return shell().wstring(); }
+#else
     static std:: string get_shell(char)    {return shell(). string(codecvt()); }
     static std::wstring get_shell(wchar_t) {return shell().wstring(codecvt());}
+#endif
 
     static exe_cmd_init<Char> cmd_shell(string_type&& cmd)
     {

include/boost/process/detail/windows/basic_pipe.hpp

@@ -158,7 +158,7 @@ basic_pipe<Char, Traits>::basic_pipe(const std::string & name)
         ::boost::process::detail::throw_last_error("create_named_pipe() failed");
 
     ::boost::winapi::HANDLE_ sink = boost::winapi::create_file(
-            name.c_str(),
+            name_.c_str(),
             ::boost::winapi::GENERIC_WRITE_, 0, nullptr,
             OPEN_EXISTING_,
             FILE_FLAG_OVERLAPPED_, //to allow read

include/boost/process/detail/windows/child_handle.hpp

@@ -81,7 +81,7 @@ struct child_handle
     {
         ::boost::winapi::BOOL_ value;
         if (!::boost::winapi::IsProcessInJob(proc_info.hProcess, nullptr, &value))
-            throw_last_error("IsProcessinJob Failed");
+            throw_last_error("IsProcessInJob Failed");
         return value!=0;
     }
     bool in_group(std::error_code &ec) const noexcept

include/boost/process/detail/windows/environment.hpp

@@ -73,8 +73,8 @@ inline auto native_environment_impl<Char>::get(const pointer_type id) -> string_
 
     if (size == sizeof(buf)) //the return size gives the size without the null, so I know this went wrong
     {
-        /*limit defined here https://msdn.microsoft.com/en-us/library/windows/desktop/ms683188(v=vs.85).aspx
-         * but I used 32768 so it is a multiple of 4096.
+        /* limit defined here https://msdn.microsoft.com/en-us/library/windows/desktop/ms683188(v=vs.85).aspx
+         * but I used 32768, so it is a multiple of 4096.
          */
         constexpr static std::size_t max_size = 32768;
         //Handle variables longer then buf.
@@ -90,12 +90,12 @@ inline auto native_environment_impl<Char>::get(const pointer_type id) -> string_
                 ::boost::process::detail::throw_last_error("GetEnvironmentVariable() failed");
             else
                 return std::basic_string<Char>(
-                        buf.data(), buf.data()+ size + 1);
+                        buf.data(), buf.data()+ size);
 
         }
 
     }
-    return std::basic_string<Char>(buf, buf+size+1);
+    return std::basic_string<Char>(buf, buf+size);
 }
 
 template<typename Char>
@@ -232,6 +232,8 @@ basic_environment_impl<Char>::basic_environment_impl(const native_environment_im
 template<typename Char>
 inline auto basic_environment_impl<Char>::get(const string_type &id) -> string_type
 {
+    if (id.size() >= _data.size()) //ok, so it is impossible id is in there.
+        return string_type(_data.data());
 
     if (std::equal(id.begin(), id.end(), _data.begin()) && (_data[id.size()] == equal_sign<Char>()))
         return string_type(_data.data()); //null-char is handled by the string.
@@ -271,7 +273,7 @@ template<typename Char>
 inline void  basic_environment_impl<Char>::reset(const string_type &id)
 {
     //ok, we need to check the size of data first
-    if (id.size() >= _data.size()) //ok, so it's impossible id is in there.
+    if (id.size() >= _data.size()) //ok, so it is impossible id is in there.
         return;
 
     //check if it's the first one, spares us the search.

include/boost/process/detail/windows/file_descriptor.hpp

@@ -10,7 +10,7 @@
 #include <boost/winapi/handles.hpp>
 #include <boost/winapi/file_management.hpp>
 #include <string>
-#include <boost/filesystem/path.hpp>
+#include <boost/process/filesystem.hpp>
 #include <boost/core/exchange.hpp>
 
 namespace boost { namespace process { namespace detail { namespace windows {
@@ -40,7 +40,7 @@ struct file_descriptor
     }
 
     file_descriptor() = default;
-    file_descriptor(const boost::filesystem::path& p, mode_t mode = read_write)
+    file_descriptor(const boost::process::filesystem::path& p, mode_t mode = read_write)
         : file_descriptor(p.native(), mode)
     {
     }

include/boost/process/detail/windows/handles.hpp

@@ -11,6 +11,8 @@
 #include <boost/process/detail/windows/handle_workaround.hpp>
 #include <boost/process/detail/windows/handler.hpp>
 #include <boost/winapi/get_current_process_id.hpp>
+#include <boost/winapi/handles.hpp>
+#include <boost/winapi/handle_info.hpp>
 
 namespace boost { namespace process { namespace detail {
 
@@ -162,7 +164,7 @@ struct limit_handles_ : handler_base_ext
     }
 
     template<typename Executor>
-    void on_sucess(Executor & exec) const
+    void on_success(Executor & exec) const
     {
         for (auto handle : handles_with_inherit_flag)
             ::boost::winapi::SetHandleInformation(handle, ::boost::winapi::HANDLE_FLAG_INHERIT_, ::boost::winapi::HANDLE_FLAG_INHERIT_);

include/boost/process/detail/windows/pipe_in.hpp

@@ -14,6 +14,8 @@
 #include <boost/winapi/handles.hpp>
 #include <boost/process/detail/used_handles.hpp>
 #include <boost/process/detail/handler_base.hpp>
+#include <boost/system/error_code.hpp>
+
 
 namespace boost { namespace process { namespace detail { namespace windows {
 

include/boost/process/detail/windows/pipe_out.hpp

@@ -15,11 +15,11 @@
 #include <boost/winapi/handles.hpp>
 #include <boost/process/detail/used_handles.hpp>
 #include <boost/process/detail/handler_base.hpp>
+#include <boost/system/error_code.hpp>
+
 
 namespace boost { namespace process { namespace detail { namespace windows {
 
-
-
 template<int p1, int p2>
 struct pipe_out : public ::boost::process::detail::handler_base, ::boost::process::detail::uses_handles
 {

include/boost/process/detail/windows/search_path.hpp

@@ -11,8 +11,7 @@
 #define BOOST_PROCESS_WINDOWS_SEARCH_PATH_HPP
 
 #include <boost/process/detail/config.hpp>
-#include <boost/filesystem/path.hpp>
-#include <boost/filesystem/operations.hpp>
+#include <boost/process/filesystem.hpp>
 #include <boost/system/error_code.hpp>
 #include <string>
 #include <stdexcept>
@@ -24,9 +23,9 @@
 
 namespace boost { namespace process { namespace detail { namespace windows {
 
-inline boost::filesystem::path search_path(
-        const boost::filesystem::path &filename,
-        const std::vector<boost::filesystem::path> &path)
+inline boost::process::filesystem::path search_path(
+        const boost::process::filesystem::path &filename,
+        const std::vector<boost::process::filesystem::path> &path)
 {
     const ::boost::process::wnative_environment ne{};
     typedef typename ::boost::process::wnative_environment::const_entry_type value_type;
@@ -36,7 +35,9 @@ inline boost::filesystem::path search_path(
             [&](const value_type & e)
              {return id == ::boost::to_upper_copy(e.get_name(), ::boost::process::detail::process_locale());});
 
-    auto extensions_in = itr->to_vector();
+    std::vector<std::wstring> extensions_in;
+    if (itr != ne.cend())
+        extensions_in = itr->to_vector();
 
     std::vector<std::wstring> extensions((extensions_in.size() * 2) + 1);
 
@@ -55,15 +56,19 @@ inline boost::filesystem::path search_path(
     for (auto & ext : extensions)
         boost::to_lower(ext);
 
-    for (const boost::filesystem::path & pp_ : path)
+    for (const boost::process::filesystem::path & pp_ : path)
     {
         auto p = pp_ / filename;
-        for (boost::filesystem::path ext : extensions)
+        for (boost::process::filesystem::path ext : extensions)
         {
-            boost::filesystem::path pp_ext = p;
+            boost::process::filesystem::path pp_ext = p;
             pp_ext += ext;
+#if defined(BOOST_PROCESS_USE_STD_FS)
+            std::error_code ec;
+#else
             boost::system::error_code ec;
-            bool file = boost::filesystem::is_regular_file(pp_ext, ec);
+#endif
+            bool file = boost::process::filesystem::is_regular_file(pp_ext, ec);
             if (!ec && file &&
                 ::boost::winapi::sh_get_file_info(pp_ext.native().c_str(), 0, 0, 0, ::boost::winapi::SHGFI_EXETYPE_))
             {

include/boost/process/detail/windows/shell_path.hpp

@@ -12,29 +12,29 @@
 
 #include <boost/process/detail/config.hpp>
 #include <system_error>
-#include <boost/filesystem/path.hpp>
+#include <boost/process/filesystem.hpp>
 #include <boost/winapi/basic_types.hpp>
 #include <boost/winapi/get_system_directory.hpp>
 
 namespace boost { namespace process { namespace detail { namespace windows {
 
-inline boost::filesystem::path shell_path()
+inline boost::process::filesystem::path shell_path()
 {
     ::boost::winapi::WCHAR_ sysdir[260];
     unsigned int size = ::boost::winapi::get_system_directory(sysdir, sizeof(sysdir));
     if (!size)
         throw_last_error("GetSystemDirectory() failed");
 
-    boost::filesystem::path p = sysdir;
+    boost::process::filesystem::path p = sysdir;
     return p / "cmd.exe";
 }
 
-inline boost::filesystem::path shell_path(std::error_code &ec) noexcept
+inline boost::process::filesystem::path shell_path(std::error_code &ec) noexcept
 {
 
     ::boost::winapi::WCHAR_ sysdir[260];
     unsigned int size = ::boost::winapi::get_system_directory(sysdir, sizeof(sysdir));
-    boost::filesystem::path p;
+    boost::process::filesystem::path p;
     if (!size)
         ec = std::error_code(
                 ::boost::winapi::GetLastError(),

include/boost/process/env.hpp

@@ -6,6 +6,7 @@
 #ifndef BOOST_PROCESS_DETAIL_ENV_HPP_
 #define BOOST_PROCESS_DETAIL_ENV_HPP_
 
+#include <boost/process/detail/traits/wchar_t.hpp>
 #include <boost/process/environment.hpp>
 #include <boost/none.hpp>
 
@@ -436,7 +437,7 @@ for both `id` and `value`.
 
 \subsubsection env_reset Reset variables
 
-Reseting signle variables can be done in the following way:
+Resetting single variables can be done in the following way:
 
 \code{.cpp}
 env[id] = boost::none;

include/boost/process/environment.hpp

@@ -11,7 +11,7 @@
 #include <boost/algorithm/string/split.hpp>
 #include <boost/algorithm/string/case_conv.hpp>
 #include <boost/iterator/transform_iterator.hpp>
-#include <boost/filesystem/path.hpp>
+#include <boost/process/filesystem.hpp>
 
 #if defined(BOOST_POSIX_API)
 #include <boost/process/detail/posix/environment.hpp>
@@ -263,7 +263,9 @@ public:
         auto st1 = key + ::boost::process::detail::equal_sign<Char>();
         while (*p != nullptr)
         {
-            if (std::equal(st1.begin(), st1.end(), *p))
+            const std::size_t len = std::char_traits<Char>::length(*p);
+            if ((std::distance(st1.begin(), st1.end()) < len)
+                 && std::equal(st1.begin(), st1.end(), *p))
                 break;
             p++;
         }
@@ -275,7 +277,9 @@ public:
         auto st1 = key + ::boost::process::detail::equal_sign<Char>();
         while (*p != nullptr)
         {
-            if (std::equal(st1.begin(), st1.end(), *p))
+            const std::size_t len = std::char_traits<Char>::length(*p);
+            if ((std::distance(st1.begin(), st1.end()) < len)
+                && std::equal(st1.begin(), st1.end(), *p))
                 break;
             p++;
         }
@@ -288,7 +292,10 @@ public:
         auto st1 = st + ::boost::process::detail::equal_sign<Char>();
         while (*p != nullptr)
         {
-            if (std::equal(st1.begin(), st1.end(), *p))
+            const std::size_t len = std::char_traits<Char>::length(*p);
+            if ((std::distance(st1.begin(), st1.end()) <
+                 static_cast<typename string_type::iterator::difference_type>(len))
+                && std::equal(st1.begin(), st1.end(), *p))
                 return 1u;
             p++;
         }
@@ -672,7 +679,7 @@ inline native_environment   environment() { return ::boost::process:: native_env
 ///Get the enviroment of the current process.
 inline wnative_environment wenvironment() { return ::boost::process::wnative_environment(); }
 ///Get the path environment variable of the current process runs.
-inline std::vector<boost::filesystem::path> path()
+inline std::vector<boost::process::filesystem::path> path()
 {
 #if defined(BOOST_WINDOWS_API)
     const ::boost::process::wnative_environment ne{};
@@ -693,7 +700,7 @@ inline std::vector<boost::filesystem::path> path()
 
     auto vec = itr->to_vector();
 
-    std::vector<boost::filesystem::path> val;
+    std::vector<boost::process::filesystem::path> val;
     val.resize(vec.size());
 
     std::copy(vec.begin(), vec.end(), val.begin());

include/boost/process/exe.hpp

@@ -36,15 +36,15 @@ namespace detail {
 struct exe_
 {
     template<typename = void>
-    inline exe_setter_<typename boost::filesystem::path::value_type> operator()(const boost::filesystem::path & pth) const
+    inline exe_setter_<typename boost::process::filesystem::path::value_type> operator()(const boost::process::filesystem::path & pth) const
     {
-        return exe_setter_<typename boost::filesystem::path::value_type>(pth.native());
+        return exe_setter_<typename boost::process::filesystem::path::value_type>(pth.native());
     }
 
     template<typename = void>
-    inline exe_setter_<typename boost::filesystem::path::value_type> operator=(const boost::filesystem::path & pth) const
+    inline exe_setter_<typename boost::process::filesystem::path::value_type> operator=(const boost::process::filesystem::path & pth) const
     {
-        return exe_setter_<typename boost::filesystem::path::value_type>(pth.native());
+        return exe_setter_<typename boost::process::filesystem::path::value_type>(pth.native());
     }
 
 
@@ -79,7 +79,7 @@ The overload form applies when to the first, when several strings are passed to
 function.
 
 The following expressions are valid, with `value` being either a C-String or
-a `std::basic_string` with `char` or `wchar_t` or a `boost::filesystem::path`.
+a `std::basic_string` with `char` or `wchar_t` or a `boost::process::filesystem::path`.
 
 \code{.cpp}
 exe="value";

include/boost/process/extend.hpp

@@ -70,7 +70,7 @@ using ::boost::process::detail::get_used_handles;
 
 ///This handler is invoked before the process in launched, to setup parameters. The required signature is `void(Exec &)`, where `Exec` is a template parameter.
 constexpr boost::process::detail::make_handler_t<boost::process::detail::on_setup_>   on_setup;
-///This handler is invoked if an error occured. The required signature is `void(auto & exec, const std::error_code&)`, where `Exec` is a template parameter.
+///This handler is invoked if an error occurred. The required signature is `void(auto & exec, const std::error_code&)`, where `Exec` is a template parameter.
 constexpr boost::process::detail::make_handler_t<boost::process::detail::on_error_>   on_error;
 ///This handler is invoked if launching the process has succeeded. The required signature is `void(auto & exec)`, where `Exec` is a template parameter.
 constexpr boost::process::detail::make_handler_t<boost::process::detail::on_success_> on_success;

include/boost/process/filesystem.hpp

@@ -0,0 +1,28 @@
+// Copyright (c) 2021 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_FILESYSTEM_HPP
+#define BOOST_PROCESS_FILESYSTEM_HPP
+
+#ifdef BOOST_PROCESS_USE_STD_FS
+#include <filesystem>
+#else
+#include <boost/filesystem/path.hpp>
+#include <boost/filesystem/operations.hpp>
+#endif
+
+namespace boost
+{
+namespace process
+{
+#ifdef BOOST_PROCESS_USE_STD_FS
+namespace filesystem = std::filesystem;
+#else
+namespace filesystem = boost::filesystem;
+#endif
+
+}
+}
+
+#endif //BOOST_PROCESS_FILESYSTEM_HPP

include/boost/process/group.hpp

@@ -122,9 +122,11 @@ public:
     {
         boost::process::detail::api::wait(_group_handle, ec);
     }
+#if !defined(BOOST_PROCESS_NO_DEPRECATED)
     /** Wait for the process group to exit for period of time.
       *  \return True if all child processes exited while waiting.*/
     template< class Rep, class Period >
+    BOOST_DEPRECATED("wait_for is unreliable")
     bool wait_for  (const std::chrono::duration<Rep, Period>& rel_time)
     {
         return boost::process::detail::api::wait_for(_group_handle, rel_time);
@@ -132,6 +134,7 @@ public:
 
     /** \overload bool wait_for(const std::chrono::duration<Rep, Period>& timeout_time ) */
     template< class Rep, class Period >
+    BOOST_DEPRECATED("wait_for is unreliable")
     bool wait_for  (const std::chrono::duration<Rep, Period>& rel_time, std::error_code & ec) noexcept
     {
         return boost::process::detail::api::wait_for(_group_handle, rel_time, ec);
@@ -140,17 +143,19 @@ public:
     /** Wait for the process group to exit until a point in time.
       *  \return True if all child processes exited while waiting.*/
     template< class Clock, class Duration >
+    BOOST_DEPRECATED("wait_until is unreliable")
     bool wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time )
     {
         return boost::process::detail::api::wait_until(_group_handle, timeout_time);
     }
     /** \overload bool wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time ) */
     template< class Clock, class Duration >
+    BOOST_DEPRECATED("wait_until is unreliable")
     bool wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time, std::error_code & ec) noexcept
     {
         return boost::process::detail::api::wait_until(_group_handle, timeout_time, ec);
     }
-
+#endif
     ///Check if the group has a valid handle.
     bool valid() const
     {

include/boost/process/handles.hpp

@@ -82,7 +82,7 @@ using limit_handles_ = ::boost::process::detail::api::limit_handles_;
 }
 
 /**
- * The limit_handles property sets all properties to be inherited only expcitly. It closes all unused file-descriptors on posix after the fork and
+ * The limit_handles property sets all properties to be inherited only explicitly. It closes all unused file-descriptors on posix after the fork and
  * removes the inherit flags on windows.
  *
  * \note This is executed after the fork on posix.

include/boost/process/io.hpp

@@ -60,9 +60,9 @@ namespace boost {
 The library allows full redirection of streams to files as shown below.
 
 \code{.cpp}
-boost::filesystem::path log    = "my_log_file.txt";
-boost::filesystem::path input  = "input.txt";
-boost::filesystem::path output = "output.txt";
+boost::process::filesystem::path log    = "my_log_file.txt";
+boost::process::filesystem::path input  = "input.txt";
+boost::process::filesystem::path output = "output.txt";
 system("my_prog", std_out>output, std_in<input, std_err>log);
 \endcode
 
@@ -152,13 +152,13 @@ struct std_in_
     api::null_in operator=(const null_t &) const {return api::null_in();}
     api::null_in operator<(const null_t &) const {return api::null_in();}
 
-    api::file_in operator=(const boost::filesystem::path &p) const {return p;}
+    api::file_in operator=(const boost::process::filesystem::path &p) const {return p;}
     api::file_in operator=(const std::string & p)            const {return p;}
     api::file_in operator=(const std::wstring &p)            const {return p;}
     api::file_in operator=(const char * p)                   const {return p;}
     api::file_in operator=(const wchar_t * p)                const {return p;}
 
-    api::file_in operator<(const boost::filesystem::path &p) const {return p;}
+    api::file_in operator<(const boost::process::filesystem::path &p) const {return p;}
     api::file_in operator<(const std::string &p)             const {return p;}
     api::file_in operator<(const std::wstring &p)            const {return p;}
     api::file_in operator<(const char*p)                     const {return p;}
@@ -209,13 +209,13 @@ struct std_out_
     api::null_out<p1,p2> operator=(const null_t &) const {return api::null_out<p1,p2>();}
     api::null_out<p1,p2> operator>(const null_t &) const {return api::null_out<p1,p2>();}
 
-    api::file_out<p1,p2> operator=(const boost::filesystem::path &p) const {return api::file_out<p1,p2>(p);}
+    api::file_out<p1,p2> operator=(const boost::process::filesystem::path &p) const {return api::file_out<p1,p2>(p);}
     api::file_out<p1,p2> operator=(const std::string &p)             const {return api::file_out<p1,p2>(p);}
     api::file_out<p1,p2> operator=(const std::wstring &p)            const {return api::file_out<p1,p2>(p);}
     api::file_out<p1,p2> operator=(const char * p)                   const {return api::file_out<p1,p2>(p);}
     api::file_out<p1,p2> operator=(const wchar_t * p)                const {return api::file_out<p1,p2>(p);}
 
-    api::file_out<p1,p2> operator>(const boost::filesystem::path &p) const {return api::file_out<p1,p2>(p);}
+    api::file_out<p1,p2> operator>(const boost::process::filesystem::path &p) const {return api::file_out<p1,p2>(p);}
     api::file_out<p1,p2> operator>(const std::string &p)             const {return api::file_out<p1,p2>(p);}
     api::file_out<p1,p2> operator>(const std::wstring &p)            const {return api::file_out<p1,p2>(p);}
     api::file_out<p1,p2> operator>(const char * p)                   const {return api::file_out<p1,p2>(p);}
@@ -282,7 +282,7 @@ This property allows to set the input stream for the child process.
 
 The file I/O simple redirects the stream to a file, for which the possible types are
 
- - `boost::filesystem::path`
+ - `boost::process::filesystem::path`
  - `std::basic_string<char_type>`
  - `const char_type*`
  - `FILE*`
@@ -424,7 +424,7 @@ This property allows to set the output stream for the child process.
 
 The file I/O simple redirects the stream to a file, for which the possible types are
 
- - `boost::filesystem::path`
+ - `boost::process::filesystem::path`
  - `std::basic_string<char_type>`
  - `const char_type*`
  - `FILE*`

include/boost/process/pipe.hpp

@@ -123,8 +123,14 @@ struct basic_pipebuf : std::basic_streambuf<CharT, Traits>
     ///Destructor -> writes the frest of the data
     ~basic_pipebuf()
     {
-        if (basic_pipebuf::is_open())
-            basic_pipebuf::overflow(Traits::eof());
+        try 
+        {
+            if (basic_pipebuf::is_open())
+                basic_pipebuf::overflow(Traits::eof());
+        }
+        catch (process_error & )
+        {
+        }
     }
 
     ///Move construct from a pipe.

include/boost/process/posix.hpp

@@ -35,7 +35,7 @@ namespace boost {
 
 namespace boost { namespace process {
 
-///Namespace containing the posix exensions.
+///Namespace containing the posix extensions.
 namespace posix {
 
 /** This property lets you modify file-descriptors other than the standard ones (0,1,2).

include/boost/process/search_path.hpp

@@ -44,8 +44,8 @@ namespace boost { namespace process {
  * \returns the absolute path to the executable filename or an
  *          empty string if filename isn't found
  */
-inline boost::filesystem::path search_path(const boost::filesystem::path &filename,
-                                    const std::vector<boost::filesystem::path> path = ::boost::this_process::path())
+inline boost::process::filesystem::path search_path(const boost::process::filesystem::path &filename,
+                                    const std::vector<boost::process::filesystem::path> path = ::boost::this_process::path())
 {
     return ::boost::process::detail::api::search_path(filename, path);
 }

include/boost/process/shell.hpp

@@ -44,18 +44,18 @@ struct shell_
 {
     constexpr shell_() {}
 
-    boost::filesystem::path operator()() const
+    boost::process::filesystem::path operator()() const
     {
         return boost::process::detail::api::shell_path();
     }
-    boost::filesystem::path operator()(std::error_code & ec) const noexcept
+    boost::process::filesystem::path operator()(std::error_code & ec) const noexcept
     {
         return boost::process::detail::api::shell_path(ec);
     }
 };
 
 template<>
-struct is_wchar_t<shell_> : is_wchar_t<boost::filesystem::path>
+struct is_wchar_t<shell_> : is_wchar_t<boost::process::filesystem::path>
 {
 };
 

include/boost/process/start_dir.hpp

@@ -23,7 +23,7 @@
 
 #include <boost/process/detail/config.hpp>
 #include <string>
-#include <boost/filesystem/path.hpp>
+#include <boost/process/filesystem.hpp>
 
 /** \file boost/process/start_dir.hpp
  *
@@ -53,8 +53,8 @@ struct start_dir_
     api::start_dir_init<Char> operator()(std::basic_string<Char> && s) const {return {std::move(s)}; }
     template<typename Char>
     api::start_dir_init<Char> operator()(const Char* s)                const {return {s}; }
-    api::start_dir_init<typename boost::filesystem::path::value_type>
-                              operator()(const boost::filesystem::path & st) const {return {st.native()}; }
+    api::start_dir_init<typename boost::process::filesystem::path::value_type>
+                              operator()(const boost::process::filesystem::path & st) const {return {st.native()}; }
 
     template<typename Char>
     api::start_dir_init<Char> operator= (const std::basic_string<Char> & st) const {return {st}; }
@@ -62,8 +62,8 @@ struct start_dir_
     api::start_dir_init<Char> operator= (std::basic_string<Char> && s) const {return {std::move(s)}; }
     template<typename Char>
     api::start_dir_init<Char> operator= (const Char* s)                const {return {s}; }
-    api::start_dir_init<typename boost::filesystem::path::value_type>
-                              operator= (const boost::filesystem::path & st) const {return {st.native()}; }
+    api::start_dir_init<typename boost::process::filesystem::path::value_type>
+                              operator= (const boost::process::filesystem::path & st) const {return {st.native()}; }
 
 };
 
@@ -100,7 +100,7 @@ start_dir=path
 start_dir(path)
 \endcode
 
-It can be used with `std::string`, `std::wstring` and `boost::filesystem::path`.
+It can be used with `std::string`, `std::wstring` and `boost::process::filesystem::path`.
 
 
  */

include/boost/process/v2.hpp

@@ -0,0 +1,19 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_HPP
+#define BOOST_PROCESS_V2_HPP
+
+#include <boost/process/v2/error.hpp>
+#include <boost/process/v2/environment.hpp>
+#include <boost/process/v2/execute.hpp>
+#include <boost/process/v2/exit_code.hpp>
+#include <boost/process/v2/pid.hpp>
+#include <boost/process/v2/popen.hpp>
+#include <boost/process/v2/process_handle.hpp>
+#include <boost/process/v2/process.hpp>
+#include <boost/process/v2/start_dir.hpp>
+#include <boost/process/v2/stdio.hpp>
+
+#endif //BOOST_PROCESS_V2_HPP

include/boost/process/v2/bind_launcher.hpp

@@ -0,0 +1,240 @@
+//
+// boost/process/v2/bind_launcher.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2022 Klemens D. Morgenstern (klemens dot morgenstern at gmx dot net)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_PROCESS_V2_BIND_LAUNCHER_HPP
+#define BOOST_PROCESS_V2_BIND_LAUNCHER_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/default_launcher.hpp>
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace detail
+{
+
+template<std::size_t ... Idx>
+struct index_sequence { };
+
+template<std::size_t Size, typename T> 
+struct make_index_sequence_impl;
+
+template<std::size_t Size, std::size_t ... Idx> 
+struct make_index_sequence_impl<Size, index_sequence<Idx...>>
+{
+    constexpr make_index_sequence_impl() {}
+    using type = typename make_index_sequence_impl<Size - 1u, index_sequence<Size - 1u, Idx...>>::type;
+};
+
+template<std::size_t ... Idx> 
+struct make_index_sequence_impl<0u, index_sequence<Idx...>>
+{
+    constexpr make_index_sequence_impl() {}
+    using type = index_sequence<Idx...>;
+};
+
+
+template<std::size_t Cnt>
+struct make_index_sequence
+{
+    using type = typename make_index_sequence_impl<Cnt, index_sequence<>>::type;
+};
+
+template<std::size_t Cnt>
+using make_index_sequence_t = typename make_index_sequence<Cnt>::type;
+
+}
+
+/** @brief  Utility class to bind initializers to a launcher
+ * @tparam Launcher The inner launcher to be used
+ * @tparam ...Init The initializers to be prepended.
+ * 
+ * This can be used when multiple processes shared some settings, 
+ * e.g. 
+ * 
+ */
+template<typename Launcher, typename ... Init>
+struct bound_launcher
+{
+    template<typename Launcher_, typename ... Init_>
+    bound_launcher(Launcher_ && l, Init_ && ... init) : 
+        launcher_(std::forward<Launcher_>(l)), init_(std::forward<Init_>(init)...) 
+    {
+    }
+
+    template<typename ExecutionContext, typename Args, typename ... Inits>
+    auto operator()(ExecutionContext & context,
+                    const typename std::enable_if<std::is_convertible<
+                            ExecutionContext&, BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context&>::value,
+                            filesystem::path >::type & executable,
+                    Args && args,
+                    Inits && ... inits) -> basic_process<typename ExecutionContext::executor_type>
+    {
+        return invoke(detail::make_index_sequence_t<sizeof...(Init)>{},
+                      context, 
+                      executable,  
+                      std::forward<Args>(args), 
+                      std::forward<Inits>(inits)...);
+    }
+
+
+    template<typename ExecutionContext, typename Args, typename ... Inits>
+    auto operator()(ExecutionContext & context,
+                    error_code & ec,
+                    const typename std::enable_if<std::is_convertible<
+                            ExecutionContext&, BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context&>::value,
+                            filesystem::path >::type & executable,
+                    Args && args,
+                    Inits && ... inits ) -> basic_process<typename ExecutionContext::executor_type>
+    {
+        return invoke(detail::make_index_sequence_t<sizeof...(Init)>{},
+                      context, ec,
+                      executable,  
+                      std::forward<Args>(args), 
+                      std::forward<Inits>(inits)...);
+    }
+
+    template<typename Executor, typename Args, typename ... Inits>
+    auto operator()(Executor exec,
+                    const typename std::enable_if<
+                            BOOST_PROCESS_V2_ASIO_NAMESPACE::execution::is_executor<Executor>::value ||
+                            BOOST_PROCESS_V2_ASIO_NAMESPACE::is_executor<Executor>::value,
+                            filesystem::path >::type & executable,
+                    Args && args,
+                    Inits && ... inits ) -> basic_process<Executor>
+    {
+        return invoke(detail::make_index_sequence_t<sizeof...(Init)>{},
+                      std::move(exec), 
+                      executable,  
+                      std::forward<Args>(args), 
+                      std::forward<Inits>(inits)...);
+    }
+
+    template<typename Executor, typename Args, typename ... Inits>
+    auto operator()(Executor exec,
+                    error_code & ec,
+                    const typename std::enable_if<
+                            BOOST_PROCESS_V2_ASIO_NAMESPACE::execution::is_executor<Executor>::value ||
+                            BOOST_PROCESS_V2_ASIO_NAMESPACE::is_executor<Executor>::value,
+                            filesystem::path >::type & executable,
+                    Args && args,
+                    Inits && ... inits ) -> basic_process<Executor>
+    {
+        return invoke(detail::make_index_sequence_t<sizeof...(Init)>{},
+                      std::move(exec), ec,
+                      executable,  
+                      std::forward<Args>(args), 
+                      std::forward<Inits>(inits)...);
+    }
+
+  private:
+    template<std::size_t ... Idx, typename ExecutionContext, typename Args, typename ... Inits>
+    auto invoke(detail::index_sequence<Idx...>, 
+                ExecutionContext & context,
+                const typename std::enable_if<std::is_convertible<
+                        ExecutionContext&, BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context&>::value,
+                        filesystem::path >::type & executable,
+                Args && args,
+                Inits && ... inits) -> basic_process<typename ExecutionContext::executor_type>
+    {
+        return launcher_(context, 
+                         executable,  
+                         std::forward<Args>(args), 
+                         std::get<Idx>(init_)...,
+                         std::forward<Inits>(inits)...);
+    }
+
+
+    template<std::size_t ... Idx, typename ExecutionContext, typename Args, typename ... Inits>
+    auto invoke(detail::index_sequence<Idx...>,
+                ExecutionContext & context,
+                error_code & ec,
+                const typename std::enable_if<std::is_convertible<
+                        ExecutionContext&, BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context&>::value,
+                        filesystem::path >::type & executable,
+                Args && args,
+                Inits && ... inits ) -> basic_process<typename ExecutionContext::executor_type>
+    {
+        return launcher_(context, ec,
+                         executable,  
+                         std::forward<Args>(args), 
+                         std::get<Idx>(init_)...,
+                         std::forward<Inits>(inits)...);
+    }
+
+    template<std::size_t ... Idx, typename Executor, typename Args, typename ... Inits>
+    auto invoke(detail::index_sequence<Idx...>,
+                Executor exec,
+                const typename std::enable_if<
+                        BOOST_PROCESS_V2_ASIO_NAMESPACE::execution::is_executor<Executor>::value ||
+                        BOOST_PROCESS_V2_ASIO_NAMESPACE::is_executor<Executor>::value,
+                        filesystem::path >::type & executable,
+                Args && args,
+                Inits && ... inits ) -> basic_process<Executor>
+    {
+        return launcher_(std::move(exec), 
+                         executable,  
+                         std::forward<Args>(args), 
+                         std::get<Idx>(init_)...,
+                         std::forward<Inits>(inits)...);
+    }
+
+    template<std::size_t ... Idx, typename Executor, typename Args, typename ... Inits>
+    auto invoke(detail::index_sequence<Idx...>,
+                Executor exec,
+                error_code & ec,
+                const typename std::enable_if<
+                        BOOST_PROCESS_V2_ASIO_NAMESPACE::execution::is_executor<Executor>::value ||
+                        BOOST_PROCESS_V2_ASIO_NAMESPACE::is_executor<Executor>::value,
+                        filesystem::path >::type & executable,
+                Args && args,
+                Inits && ... inits ) -> basic_process<Executor>
+    {
+        return launcher_(std::move(exec), ec,
+                         executable,  
+                         std::forward<Args>(args), 
+                         std::get<Idx>(init_)...,
+                         std::forward<Inits>(inits)...);
+    }
+
+    Launcher launcher_;
+    std::tuple<Init...> init_;
+};
+
+
+template<typename Launcher, typename ... Init>
+auto bind_launcher(Launcher && launcher, Init && ... init)
+    -> bound_launcher<typename std::decay<Launcher>::type,
+                      typename std::decay<Init>::type...>
+{
+    return bound_launcher<typename std::decay<Launcher>::type,
+                          typename std::decay<Init>::type...>(
+                            std::forward<Launcher>(launcher), 
+                            std::forward<Init>(init)...);
+}
+
+/// @brief  @overload bind_launcher(Launcher && launcher, Init && init)
+/// @tparam ...Init The initializer types to bind to the default_launcher.
+/// @param ...init The initializers types to bind to the default_launcher.
+/// @return The new default_launcher.
+template<typename ... Init>
+auto bind_default_launcher(Init && ... init)
+    -> bound_launcher<default_process_launcher,
+                      typename std::decay<Init>::type...>
+{
+    return bound_launcher<default_process_launcher,
+                          typename std::decay<Init>::type...>(
+                            default_process_launcher(), 
+                            std::forward<Init>(init)...);
+}
+
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif // BOOST_PROCESS_V2_BIND_LAUNCHER_HPP

include/boost/process/v2/cstring_ref.hpp

@@ -0,0 +1,232 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_CSTRING_REF_HPP
+#define BOOST_PROCESS_V2_CSTRING_REF_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+
+#if defined(BOOST_PROCESS_V2_STANDALONE)
+#include <string_view>
+#else
+#include <boost/utility/string_view.hpp>
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace detail
+{
+
+BOOST_CONSTEXPR static const char*     null_char_(char)     {return "";}
+BOOST_CONSTEXPR static const wchar_t*  null_char_(wchar_t)  {return L"";}
+BOOST_CONSTEXPR static const char16_t* null_char_(char16_t) {return u"";}
+BOOST_CONSTEXPR static const char32_t* null_char_(char32_t) {return U"";}
+
+#if defined(BOOST_PROCESS_V2_HAS_CHAR8_T)
+BOOST_CONSTEXPR static const char8_t* null_char_(char8_t) {return u8"";}
+#endif
+
+}
+
+#if defined(BOOST_PROCESS_V2_STANDALONE)
+using std::basic_string_view;
+using std::   string_view;
+using std::  wstring_view;
+#else
+using boost::basic_string_view;
+using boost::   string_view;
+using boost::  wstring_view;
+#endif
+
+
+/// Small wrapper for a null-terminated string that can be directly passed to C APIS
+/** This ref can only be modified by moving the front pointer. It does not store the 
+ * size, but can detect values that can directly be passed to system APIs.
+ * 
+ * It can be constructed from a `char*` pointer or any class that has a `c_str()` 
+ * member function, e.g. std::string or boost::static_string.
+ * 
+ */
+template<typename CharT, typename Traits = std::char_traits<CharT>>
+struct basic_cstring_ref
+{
+    using value_type             = CharT;
+    using traits_type            = Traits;
+
+    BOOST_CONSTEXPR basic_cstring_ref() noexcept : view_(detail::null_char_(value_type{})) {}
+    BOOST_CONSTEXPR basic_cstring_ref(std::nullptr_t) = delete;
+
+    BOOST_CONSTEXPR basic_cstring_ref( const value_type* s ) : view_(s) {}
+
+    template<typename Source,
+            typename =
+            typename std::enable_if<
+                    std::is_same<const value_type,
+                            typename std::remove_pointer<decltype(std::declval<Source>().c_str())>::type
+                    >::value>::type>
+    BOOST_CONSTEXPR basic_cstring_ref(Source && src) : view_(src.c_str()) {}
+
+    BOOST_CONSTEXPR typename basic_string_view<value_type, Traits>::const_pointer c_str() const BOOST_NOEXCEPT
+    {
+        return this->data();
+    }
+
+    using string_view_type = basic_string_view<value_type, Traits>;
+    constexpr operator string_view_type() const {return view_;}
+
+    using pointer                =       CharT *;
+    using const_pointer          = const CharT *;
+    using reference              =       CharT &;
+    using const_reference        = const CharT &;
+    using const_iterator         = const_pointer;
+    using iterator               = const_iterator;
+    using const_reverse_iterator = typename std::reverse_iterator<const_iterator>;
+    using reverse_iterator       = typename std::reverse_iterator<iterator>;
+    using size_type              = std::size_t;
+    using difference_type        = std::ptrdiff_t;
+
+    static BOOST_CONSTEXPR size_type npos = -1;
+
+    BOOST_CONSTEXPR const_iterator begin()  const BOOST_NOEXCEPT {return view_;};
+    BOOST_CONSTEXPR const_iterator end()    const BOOST_NOEXCEPT {return view_ + length();};
+    BOOST_CONSTEXPR const_iterator cbegin() const BOOST_NOEXCEPT {return view_;};
+    BOOST_CONSTEXPR const_iterator cend()   const BOOST_NOEXCEPT {return view_ + length();};
+    BOOST_CONSTEXPR const_reverse_iterator rbegin()  const BOOST_NOEXCEPT {return reverse_iterator(view_ + length());};
+    BOOST_CONSTEXPR const_reverse_iterator rend()    const BOOST_NOEXCEPT {return reverse_iterator(view_);};
+    BOOST_CONSTEXPR const_reverse_iterator crbegin() const BOOST_NOEXCEPT {return reverse_iterator(view_ + length());};
+    BOOST_CONSTEXPR const_reverse_iterator crend()   const BOOST_NOEXCEPT {return reverse_iterator(view_);};
+
+    BOOST_CONSTEXPR size_type size() const BOOST_NOEXCEPT {return length(); }
+    BOOST_CONSTEXPR size_type length() const BOOST_NOEXCEPT {return traits_type::length(view_); }
+    BOOST_CONSTEXPR size_type max_size() const BOOST_NOEXCEPT {return (std::numeric_limits<std::size_t>::max)() / sizeof(CharT); }
+    BOOST_ATTRIBUTE_NODISCARD BOOST_CONSTEXPR bool empty() const BOOST_NOEXCEPT {return *view_ == *detail::null_char_(CharT{}); }
+
+    BOOST_CONSTEXPR const_reference operator[](size_type pos) const  {return view_[pos] ;}
+    BOOST_CXX14_CONSTEXPR const_reference at(size_type pos) const
+    {
+        if (pos >= size())
+            throw_exception(std::out_of_range("cstring-view out of range"));
+        return view_[pos];
+    }
+    BOOST_CONSTEXPR const_reference front() const  {return *view_;}
+    BOOST_CONSTEXPR const_reference back()  const  {return view_[length() - 1];}
+    BOOST_CONSTEXPR const_pointer data()    const BOOST_NOEXCEPT  {return view_;}
+    BOOST_CXX14_CONSTEXPR void remove_prefix(size_type n)  {view_ = view_ + n;}
+    void swap(basic_cstring_ref& s) BOOST_NOEXCEPT {std::swap(view_, s.view_);}
+
+    size_type copy(value_type* s, size_type n, size_type pos = 0) const
+    {
+        return traits_type::copy(s, view_ + pos, n) - view_;
+    }
+    BOOST_CONSTEXPR basic_cstring_ref substr(size_type pos = 0) const
+    {
+        return basic_cstring_ref(view_ + pos);
+    }
+
+    BOOST_CONSTEXPR string_view_type substr(size_type pos, size_type length) const
+    {
+        return string_view_type(view_).substr(pos, length);
+    }
+
+    BOOST_CXX14_CONSTEXPR int compare(basic_cstring_ref x) const BOOST_NOEXCEPT
+    {
+        auto idx = 0u;
+        for (; view_[idx] != null_char_()[0] && x[idx] != null_char_()[0]; idx++)
+            if (!traits_type::eq(view_[idx], x[idx]))
+                return traits_type::lt(view_[idx], x[idx]) ? -1 : 1;
+
+        return traits_type::to_int_type(view_[idx]) -
+               traits_type::to_int_type(x[idx]); // will compare to null char of either.
+    }
+
+    BOOST_CXX14_CONSTEXPR bool starts_with(string_view_type x) const BOOST_NOEXCEPT
+    {
+        if (x.empty())
+            return true;
+
+        auto idx = 0u;
+        for (; view_[idx] != null_char_()[0] && idx < x.size(); idx++)
+            if (!traits_type::eq(view_[idx], x[idx]))
+                return false;
+
+        return idx == x.size() || view_[idx] != null_char_()[0];
+    }
+    BOOST_CONSTEXPR bool starts_with(value_type x)       const BOOST_NOEXCEPT
+    {
+        return traits_type::eq(view_[0], x);
+    }
+
+    BOOST_CXX14_CONSTEXPR size_type find( CharT ch, size_type pos = 0 ) const BOOST_NOEXCEPT
+    {
+        for (auto p = view_ + pos; *p != *null_char_(); p++)
+            if (traits_type::eq(*p, ch))
+                return p - view_;
+        return npos;
+    }
+
+
+    friend BOOST_CXX14_CONSTEXPR bool operator==(basic_cstring_ref x, basic_cstring_ref y) BOOST_NOEXCEPT
+    {
+        std::size_t idx = 0u;
+        for (idx = 0u; x[idx] != null_char_()[0] && y[idx] != null_char_()[0]; idx++)
+            if (!traits_type::eq(x[idx], y[idx]))
+                return false;
+        return x[idx] == y[idx];
+    }
+    friend BOOST_CXX14_CONSTEXPR bool operator!=(basic_cstring_ref x, basic_cstring_ref y) BOOST_NOEXCEPT
+    {
+        std::size_t idx = 0u;
+        for (idx = 0u; x[idx] != null_char_()[0] &&
+                       y[idx] != null_char_()[0]; idx++)
+            if (!traits_type::eq(x[idx], y[idx]))
+                return true;
+        return x[idx] != y[idx];
+    }
+    friend BOOST_CXX14_CONSTEXPR bool operator< (basic_cstring_ref x, basic_cstring_ref y) BOOST_NOEXCEPT {return x.compare(y) <  0;}
+    friend BOOST_CXX14_CONSTEXPR bool operator> (basic_cstring_ref x, basic_cstring_ref y) BOOST_NOEXCEPT {return x.compare(y) >  0;}
+    friend BOOST_CXX14_CONSTEXPR bool operator<=(basic_cstring_ref x, basic_cstring_ref y) BOOST_NOEXCEPT {return x.compare(y) <= 0;}
+    friend BOOST_CXX14_CONSTEXPR bool operator>=(basic_cstring_ref x, basic_cstring_ref y) BOOST_NOEXCEPT {return x.compare(y) >= 0;}
+
+    // modifiers
+    void clear() BOOST_NOEXCEPT { view_ =  null_char_(); }          // Boost extension
+
+    std::basic_string<value_type, traits_type> to_string() const {
+        return std::basic_string<CharT, Traits>(begin(), end());
+    }
+
+    template<typename Allocator>
+    std::basic_string<value_type, traits_type, Allocator> to_string(const Allocator& a) const {
+        return std::basic_string<value_type, traits_type, Allocator>(begin(), end(), a);
+    }
+
+  private:
+    BOOST_CONSTEXPR static const_pointer   null_char_()         {return detail::null_char_(CharT{});}
+    const_pointer view_;
+};
+
+template<class charT, class traits>
+inline std::basic_ostream<charT, traits>&
+operator<<(std::basic_ostream<charT, traits>& os,
+           const basic_cstring_ref<charT,traits>& str)
+{
+    return os << static_cast<basic_string_view<charT, traits>>(str);
+}
+
+template <class charT, class traits>
+std::size_t hash_value(basic_string_view<charT, traits> s) {
+    return boost::hash_range(s.begin(), s.end());
+}
+
+using cstring_ref    = basic_cstring_ref<char>;
+using wcstring_ref   = basic_cstring_ref<wchar_t>;
+using u16cstring_ref = basic_cstring_ref<char16_t>;
+using u32cstring_ref = basic_cstring_ref<char32_t>;
+
+#if defined(BOOST_PROCESS_V2_HAS_CHAR8_T)
+using u8cstring_ref  = basic_cstring_ref<char8_t>;
+#endif
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //BOOST_PROCESS_V2_CSTRING_REF_HPP

include/boost/process/v2/default_launcher.hpp

@@ -0,0 +1,66 @@
+//
+// boost/process/v2/default_launcher.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2022 Klemens D. Morgenstern (klemens dot morgenstern at gmx dot net)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_PROCESS_V2_DEFAULT_LAUNCHER_HPP
+#define BOOST_PROCESS_V2_DEFAULT_LAUNCHER_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+#include <boost/process/v2/windows/default_launcher.hpp>
+#else
+#if defined(BOOST_PROCESS_V2_PDFORK)
+#include <boost/process/v2/posix/pdfork_launcher.hpp>
+#else
+#include <boost/process/v2/posix/default_launcher.hpp>
+#endif
+
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+#if defined(GENERATING_DOCUMENTATION)
+
+/// The default launcher for processes.
+/** This launcher will be used by process if a 
+ * process is launched through the constructor:
+ * 
+ * @code {.cpp}
+ * process proc("test", {});
+ * // equivalent to
+ * process prod = default_launcher()("test", {});
+ * @endcode
+ * 
+ */
+
+typedef implementation_defined default_process_launcher;
+
+#else
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+typedef windows::default_launcher default_process_launcher;
+#else
+#if defined(BOOST_PROCESS_V2_PDFORK)
+typedef posix::pdfork_launcher default_process_launcher;
+#else
+typedef posix::default_launcher default_process_launcher;
+#endif
+#endif
+
+
+#endif
+
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#if defined(BOOST_PROCESS_V2_HEADER_ONLY)
+#include <boost/process/v2/impl/default_launcher.ipp>
+#endif
+
+#endif //BOOST_PROCESS_V2_DEFAULT_LAUNCHER_HPP

include/boost/process/v2/detail/config.hpp

@@ -0,0 +1,180 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_CONFIG_HPP
+#define BOOST_PROCESS_V2_DETAIL_CONFIG_HPP
+
+#if defined(BOOST_PROCESS_V2_STANDALONE)
+
+#define BOOST_PROCESS_V2_ASIO_NAMESPACE asio
+#define BOOST_PROCESS_V2_COMPLETION_TOKEN_FOR(Sig) ASIO_COMPLETION_TOKEN_FOR(Sig)
+#define BOOST_PROCESS_V2_DEFAULT_COMPLETION_TOKEN_TYPE(Executor) ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(Executor)
+#define BOOST_PROCESS_V2_INITFN_AUTO_RESULT_TYPE(Token, Signature) ASIO_INITFN_AUTO_RESULT_TYPE(Token, Signature)
+#define BOOST_PROCESS_V2_DEFAULT_COMPLETION_TOKEN(Executor) ASIO_DEFAULT_COMPLETION_TOKEN(Executor)
+#define BOOST_PROCESS_V2_INITFN_DEDUCED_RESULT_TYPE(x,y,z) ASIO_INITFN_DEDUCED_RESULT_TYPE(x,y,z)
+
+#include <asio/detail/config.hpp>
+#include <system_error>
+#include <filesystem>
+#include <string_view>
+#include <iomanip>
+#include <optional>
+
+#if defined(ASIO_WINDOWS)
+#define BOOST_PROCESS_V2_WINDOWS 1
+
+// Windows: suppress definition of "min" and "max" macros.
+#if !defined(NOMINMAX)
+# define NOMINMAX 1
+#endif
+#endif
+
+#if defined(ASIO_HAS_UNISTD_H)
+#define BOOST_PROCESS_V2_POSIX 1
+#endif
+
+#define BOOST_PROCESS_V2_BEGIN_NAMESPACE namespace process_v2 {
+#define BOOST_PROCESS_V2_END_NAMESPACE   }
+#define BOOST_PROCESS_V2_NAMESPACE process_v2
+
+#else
+
+#define BOOST_PROCESS_V2_ASIO_NAMESPACE boost::asio
+#define BOOST_PROCESS_V2_COMPLETION_TOKEN_FOR(Sig) BOOST_ASIO_COMPLETION_TOKEN_FOR(Sig)
+#define BOOST_PROCESS_V2_DEFAULT_COMPLETION_TOKEN_TYPE(Executor) BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(Executor)
+#define BOOST_PROCESS_V2_INITFN_AUTO_RESULT_TYPE(Token, Signature) BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(Token, Signature)
+#define BOOST_PROCESS_V2_DEFAULT_COMPLETION_TOKEN(Executor) BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(Executor)
+#define BOOST_PROCESS_V2_INITFN_DEDUCED_RESULT_TYPE(x,y,z) BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(x,y,z)
+
+#include <boost/config.hpp>
+#include <boost/io/quoted.hpp>
+#include <boost/system/error_code.hpp>
+#include <boost/system/system_category.hpp>
+#include <boost/system/system_error.hpp>
+#include <boost/optional.hpp>
+
+#if defined(BOOST_WINDOWS_API)
+#define BOOST_PROCESS_V2_WINDOWS 1
+
+// Windows: suppress definition of "min" and "max" macros.
+#if !defined(NOMINMAX)
+# define NOMINMAX 1
+#endif
+
+#endif
+
+#if defined(BOOST_POSIX_API)
+#define BOOST_PROCESS_V2_POSIX 1
+#endif
+
+#if !defined(BOOST_PROCESS_V2_WINDOWS) && !defined(BOOST_POSIX_API)
+#error Unsupported operating system
+#endif
+
+#if defined(BOOST_PROCESS_USE_STD_FS)
+#include <filesystem>
+#else
+#include <boost/filesystem/path.hpp>
+#include <boost/filesystem/operations.hpp>
+#endif
+
+#define BOOST_PROCESS_V2_BEGIN_NAMESPACE namespace boost { namespace process { namespace v2 {
+#define BOOST_PROCESS_V2_END_NAMESPACE  } } }
+#define BOOST_PROCESS_V2_NAMESPACE boost::process::v2
+
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+#if defined(BOOST_PROCESS_STANDALONE)
+
+using std::error_code ;
+using std::error_category ;
+using std::system_category ;
+using std::system_error ;
+namespace filesystem = std::filesystem;
+using std::quoted;
+using std::optional;
+
+#define BOOST_PROCESS_V2_RETURN_EC(ev)                                                                  \
+  return ::BOOST_PROCESS_V2_NAMESPACE::error_code(ev, ::BOOST_PROCESS_V2_NAMESPACE::system_category()); \
+
+#define BOOST_PROCESS_V2_ASSIGN_EC(ec, ...) ec.assign(__VA_ARGS__);
+#define BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)                         \
+  ec.assign(::BOOST_PROCESS_V2_NAMESPACE::detail::get_last_error());   \
+
+
+#else
+
+using boost::system::error_code ;
+using boost::system::error_category ;
+using boost::system::system_category ;
+using boost::system::system_error ;
+using boost::io::quoted;
+using boost::optional;
+
+#ifdef BOOST_PROCESS_USE_STD_FS
+namespace filesystem = std::filesystem;
+#else
+namespace filesystem = boost::filesystem;
+#endif
+
+#define BOOST_PROCESS_V2_RETURN_EC(ev)                                                                     \
+{                                                                                                          \
+  static constexpr auto loc##__LINE__((BOOST_CURRENT_LOCATION));                                           \
+  return ::BOOST_PROCESS_V2_NAMESPACE::error_code(ev, ::BOOST_PROCESS_V2_NAMESPACE::system_category(), &loc##__LINE__);   \
+}
+
+#define BOOST_PROCESS_V2_ASSIGN_EC(ec, ...)                       \
+{                                                                 \
+  static constexpr auto loc##__LINE__((BOOST_CURRENT_LOCATION));  \
+  ec.assign(__VA_ARGS__,  &loc##__LINE__);                        \
+}
+
+#define BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)                                         \
+{                                                                                      \
+  static constexpr auto loc##__LINE__((BOOST_CURRENT_LOCATION));                       \
+  ec.assign(::BOOST_PROCESS_V2_NAMESPACE::detail::get_last_error(), &loc##__LINE__);   \
+}
+
+
+#endif
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#ifndef BOOST_PROCESS_V2_HEADER_ONLY
+# ifndef BOOST_PROCESS_V2_SEPARATE_COMPILATION
+#   define BOOST_PROCESS_V2_HEADER_ONLY 1
+# endif
+#endif
+
+#if BOOST_PROCESS_V2_DOXYGEN
+# define BOOST_PROCESS_V2_DECL
+#elif defined(BOOST_PROCESS_V2_HEADER_ONLY)
+# define BOOST_PROCESS_V2_DECL inline
+#else
+# define BOOST_PROCESS_V2_DECL
+#endif
+
+#if defined(BOOST_PROCESS_V2_POSIX)
+
+#if defined(__linux__) && !defined(BOOST_PROCESS_V2_DISABLE_PIDFD_OPEN)
+
+#include <sys/syscall.h>
+
+#if defined(SYS_pidfd_open)
+#define BOOST_PROCESS_V2_PIDFD_OPEN 1
+#define BOOST_PROCESS_V2_HAS_PROCESS_HANDLE 1
+#endif
+#endif
+
+#if defined(__FreeBSD__) && defined(BOOST_PROCESS_V2_ENABLE_PDFORK)
+#define BOOST_PROCESS_V2_PDFORK 1
+#define BOOST_PROCESS_V2_HAS_PROCESS_HANDLE 1
+#endif
+#else
+#define BOOST_PROCESS_V2_HAS_PROCESS_HANDLE 1
+#endif
+
+#endif //BOOST_PROCESS_V2_DETAIL_CONFIG_HPP

include/boost/process/v2/detail/environment_posix.hpp

@@ -0,0 +1,80 @@
+//
+// process/environment/detail/environment_posix.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2021 Klemens D. Morgenstern (klemens dot morgenstern at gmx dot net)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_PROCESS_V2_DETAIL_ENVIRONMENT_POSIX_HPP
+#define BOOST_PROCESS_V2_DETAIL_ENVIRONMENT_POSIX_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/cstring_ref.hpp>
+
+#if defined(__APPLE__) || defined(__MACH__) || defined(__FreeBSD__) || defined(__DragonFly__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__sun)
+extern "C" { extern char **environ; }
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace environment
+{
+
+using char_type = char;
+
+template<typename Char>
+using key_char_traits = std::char_traits<Char>;
+
+template<typename Char>
+using value_char_traits = std::char_traits<Char>;
+
+
+constexpr char_type equality_sign = '=';
+constexpr char_type delimiter = ':';
+
+namespace detail
+{
+
+BOOST_PROCESS_V2_DECL
+basic_cstring_ref<char_type, value_char_traits<char>>
+get(basic_cstring_ref<char_type, key_char_traits<char_type>> key, error_code & ec);
+
+BOOST_PROCESS_V2_DECL
+void set(basic_cstring_ref<char_type, key_char_traits<char_type>> key,
+         basic_cstring_ref<char_type, value_char_traits<char_type>> value,
+         error_code & ec);
+
+BOOST_PROCESS_V2_DECL
+void unset(basic_cstring_ref<char_type, key_char_traits<char_type>> key,
+           error_code & ec);
+}
+
+
+using native_handle_type   = const char * const *;
+using native_iterator = native_handle_type;
+
+namespace detail
+{
+
+BOOST_PROCESS_V2_DECL native_handle_type load_native_handle();
+struct native_handle_deleter
+{
+    void operator()(native_handle_type) const {}
+};
+
+BOOST_PROCESS_V2_DECL native_iterator next(native_handle_type nh);
+BOOST_PROCESS_V2_DECL native_iterator find_end(native_handle_type nh);
+inline const char_type * dereference(native_iterator iterator) {return *iterator;}
+
+BOOST_PROCESS_V2_DECL bool is_executable(const filesystem::path & pth, error_code & ec);
+
+}
+
+}
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif

include/boost/process/v2/detail/environment_win.hpp

@@ -0,0 +1,212 @@
+//
+// process/environment/detail/environment_win.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2021 Klemens D. Morgenstern (klemens dot morgenstern at gmx dot net)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_PROCESS_V2_DETAIL_ENVIRONMENT_WIN_HPP
+#define BOOST_PROCESS_V2_DETAIL_ENVIRONMENT_WIN_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/cstring_ref.hpp>
+
+#include <cwctype>
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace environment
+{
+
+using char_type = wchar_t;
+
+template<typename Char>
+struct key_char_traits
+{
+  typedef Char      char_type;
+  typedef typename std::char_traits<char_type>::int_type  int_type;
+  typedef typename std::char_traits<char_type>::off_type   off_type;
+  typedef typename std::char_traits<char_type>::pos_type   pos_type;
+  typedef typename std::char_traits<char_type>::state_type state_type;
+
+  BOOST_CONSTEXPR static char    to_lower(char c)    {return std::tolower(to_int_type(c));}
+  BOOST_CONSTEXPR static wchar_t to_lower(wchar_t c) {return std::towlower(to_int_type(c));}
+
+  BOOST_CONSTEXPR static int_type to_lower(int_type i, char )   {return std::tolower(i);}
+  BOOST_CONSTEXPR static int_type to_lower(int_type i, wchar_t) {return std::towlower(i);}
+
+
+  BOOST_CONSTEXPR static
+  void assign(char_type& c1, const char_type& c2) BOOST_NOEXCEPT
+  {
+    c1 = c2;
+  }
+
+  BOOST_CONSTEXPR static
+  bool eq(char_type c1, char_type c2) BOOST_NOEXCEPT
+  {
+    return to_lower(c1) == to_lower(c2);
+  }
+
+  BOOST_CONSTEXPR static
+  bool lt(char_type c1, char_type c2) BOOST_NOEXCEPT
+  {
+    return to_lower(c1) < to_lower(c2);
+  }
+
+  BOOST_CONSTEXPR static
+  int compare(const char_type* s1, const char_type* s2, size_t n) BOOST_NOEXCEPT
+  {
+    auto itrs = std::mismatch(s1, s1 + n, s2, &eq);
+    if (itrs.first == (s1 + n))
+      return 0;
+    auto c1 = to_lower(*itrs.first);
+    auto c2 = to_lower(*itrs.second);
+
+    return (c1 < c2 ) ? -1 : 1;
+  }
+
+  BOOST_CONSTEXPR static size_t length(const char* s)    BOOST_NOEXCEPT  { return std::strlen(s); }
+  BOOST_CONSTEXPR static size_t length(const wchar_t* s) BOOST_NOEXCEPT  { return std::wcslen(s); }
+
+  BOOST_CONSTEXPR static
+  const char_type* find(const char_type* s, size_t n, const char_type& a) BOOST_NOEXCEPT
+  {
+    const char_type u = to_lower(a);
+    return std::find_if(s, s + n, [u](char_type c){return to_lower(c) == u;});
+  }
+
+  BOOST_CONSTEXPR static
+  char_type* move(char_type* s1, const char_type* s2, size_t n) BOOST_NOEXCEPT
+  {
+    if (s1 < s2)
+      return std::move(s2, s2 + n, s1);
+    else
+      return std::move_backward(s2, s2 + n, s1);
+  }
+
+  BOOST_CONSTEXPR static
+  char_type* copy(char_type* s1, const char_type* s2, size_t n) BOOST_NOEXCEPT
+  {
+    return std::copy(s2, s2 + n, s1);
+  }
+
+  BOOST_CONSTEXPR static
+  char_type* assign(char_type* s, size_t n, char_type a) BOOST_NOEXCEPT
+  {
+    std::fill(s, s + n, a);
+    return s +n;
+  }
+
+  BOOST_CONSTEXPR static
+  int_type not_eof(int_type c) BOOST_NOEXCEPT
+  {
+    return eq_int_type(c, eof()) ? ~eof() : c;
+  }
+
+  BOOST_CONSTEXPR static
+  char_type to_char_type(int_type c) BOOST_NOEXCEPT
+  {
+    return char_type(c);
+  }
+
+  BOOST_CONSTEXPR static
+  int_type to_int_type(char c) BOOST_NOEXCEPT
+  {
+    return int_type((unsigned char)c);
+  }
+
+  BOOST_CONSTEXPR static
+  int_type to_int_type(wchar_t c) BOOST_NOEXCEPT
+  {
+    return int_type((wchar_t)c);
+  }
+
+  BOOST_CONSTEXPR static
+  bool eq_int_type(int_type c1, int_type c2) BOOST_NOEXCEPT
+  {
+    return to_lower(c1, char_type()) == to_lower(c2, char_type());
+  }
+
+  BOOST_CONSTEXPR static inline int_type eof() BOOST_NOEXCEPT
+  {
+    return int_type(EOF);
+  }
+};
+
+namespace detail
+{
+
+
+template<typename Char>
+std::size_t hash_step(std::size_t prev, Char c, key_char_traits<Char>)
+{
+    return prev ^ (key_char_traits<Char>::to_lower(c) << 1);
+}
+
+
+}
+
+template<typename Char>
+using value_char_traits = std::char_traits<Char>;
+
+BOOST_CONSTEXPR static char_type equality_sign = L'=';
+BOOST_CONSTEXPR static char_type delimiter = L';';
+
+using native_handle_type   = wchar_t*;
+using native_iterator = const wchar_t*;
+
+namespace detail
+{
+
+BOOST_PROCESS_V2_DECL
+std::basic_string<wchar_t, value_char_traits<wchar_t>> get(
+        basic_cstring_ref<wchar_t, key_char_traits<wchar_t>> key,
+        error_code & ec);
+
+BOOST_PROCESS_V2_DECL
+void set(basic_cstring_ref<wchar_t,   key_char_traits<wchar_t>> key,
+         basic_cstring_ref<wchar_t, value_char_traits<wchar_t>> value,
+         error_code & ec);
+
+BOOST_PROCESS_V2_DECL
+void unset(basic_cstring_ref<wchar_t, key_char_traits<wchar_t>> key,
+           error_code & ec);
+
+
+BOOST_PROCESS_V2_DECL
+std::basic_string<char, value_char_traits<char>> get(
+        basic_cstring_ref<char, key_char_traits<char>> key,
+        error_code & ec);
+
+BOOST_PROCESS_V2_DECL
+void set(basic_cstring_ref<char,   key_char_traits<char>> key,
+         basic_cstring_ref<char, value_char_traits<char>> value,
+         error_code & ec);
+
+BOOST_PROCESS_V2_DECL
+void unset(basic_cstring_ref<char, key_char_traits<char>> key,
+           error_code & ec);
+
+BOOST_PROCESS_V2_DECL native_handle_type load_native_handle();
+struct native_handle_deleter
+{
+  native_handle_deleter() = default;
+  native_handle_deleter(const native_handle_deleter& ) = default;
+  BOOST_PROCESS_V2_DECL void operator()(native_handle_type nh) const;
+
+};
+
+inline const char_type * dereference(native_iterator iterator) {return iterator;}
+BOOST_PROCESS_V2_DECL native_iterator next(native_iterator nh);
+BOOST_PROCESS_V2_DECL native_iterator find_end(native_handle_type nh);
+BOOST_PROCESS_V2_DECL bool is_executable(const filesystem::path & pth, error_code & ec);
+}
+
+}
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //BOOST_PROCESS_V2_DETAIL_ENVIRONMENT_WIN_HPP

include/boost/process/v2/detail/impl/environment.ipp

@@ -0,0 +1,18 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_IMPL_ENVIRONMENT_IPP
+#define BOOST_PROCESS_V2_DETAIL_IMPL_ENVIRONMENT_IPP
+
+#include <boost/process/v2/detail/config.hpp>
+
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+#include <boost/process/v2/detail/impl/environment_win.ipp>
+#elif defined(BOOST_PROCESS_V2_POSIX)
+#include <boost/process/v2/detail/impl/environment_posix.ipp>
+#else
+#error Operating System not supported.
+#endif
+
+#endif //BOOST_PROCESS_V2_DETAIL_IMPL_ENVIRONMENT_IPP

include/boost/process/v2/detail/impl/environment_posix.ipp

@@ -0,0 +1,81 @@
+//
+// process/this_process/detail/environment_posix.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2021 Klemens D. Morgenstern (klemens dot morgenstern at gmx dot net)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_PROCESS_V2_DETAIL_ENVIRONMENT_WIN_HPP
+#define BOOST_PROCESS_V2_DETAIL_ENVIRONMENT_WIN_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/detail/last_error.hpp>
+#include <boost/process/v2/environment.hpp>
+#include <boost/process/v2/cstring_ref.hpp>
+
+#include <unistd.h>
+#include <cstring>
+
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace environment
+{
+namespace detail
+{
+
+basic_cstring_ref<char_type, value_char_traits<char>> get(
+        basic_cstring_ref<char_type, key_char_traits<char_type>> key,
+        error_code & ec)
+{
+    auto res = ::getenv(key.c_str());
+    if (res == nullptr)
+    {
+        BOOST_PROCESS_V2_ASSIGN_EC(ec, ENOENT, system_category())
+        return {};
+    }
+    return res;
+}
+
+void set(basic_cstring_ref<char_type,   key_char_traits<char_type>>   key,
+         basic_cstring_ref<char_type, value_char_traits<char_type>> value,
+                error_code & ec)
+{
+    if (::setenv(key.c_str(), value.c_str(), true))
+        BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+}
+
+void unset(basic_cstring_ref<char_type, key_char_traits<char_type>> key, error_code & ec)
+{
+    if (::unsetenv(key.c_str()))
+        BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+}
+
+
+native_handle_type load_native_handle() { return ::environ; }
+
+
+native_iterator next(native_iterator nh)
+{
+    return nh + 1;
+}
+
+native_iterator find_end(native_handle_type nh)
+{
+    while (*nh != nullptr)
+        nh++;
+    return nh;
+}
+bool is_executable(const filesystem::path & p, error_code & ec)
+{
+    return filesystem::is_regular_file(p, ec) && (::access(p.c_str(), X_OK) == 0);
+}
+
+}
+}
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //BOOST_PROCESS_V2_DETAIL_ENVIRONMENT_WIN_HPP

include/boost/process/v2/detail/impl/environment_win.ipp

@@ -0,0 +1,142 @@
+//
+// process/this_process/detail/environment_win.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2021 Klemens D. Morgenstern (klemens dot morgenstern at gmx dot net)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_PROCESS_V2_DETAIL_IMPL_ENVIRONMENT_WIN_IPP
+#define BOOST_PROCESS_V2_DETAIL_IMPL_ENVIRONMENT_WIN_IPP
+
+
+#include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/detail/environment_win.hpp>
+#include <boost/process/v2/detail/impl/environment.ipp>
+#include <boost/process/v2/detail/last_error.hpp>
+
+#include <algorithm>
+#include <cwctype>
+#include <cstring>
+
+#include <shellapi.h>
+
+#include <boost/process/v2/cstring_ref.hpp>
+#include <boost/process/v2/error.hpp>
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace environment
+{
+namespace detail
+{
+
+std::basic_string<char_type, value_char_traits<char_type>> get(
+        basic_cstring_ref<char_type, key_char_traits<char_type>> key,
+        error_code & ec)
+{
+  std::basic_string<char_type, value_char_traits<char_type>> buf;
+
+  std::size_t size = 0u;
+  do
+  {
+    buf.resize(buf.size() + 4096);
+    size = ::GetEnvironmentVariableW(key.c_str(), &buf.front(), static_cast<DWORD>(buf.size()));
+  }
+  while (size == buf.size());
+
+  buf.resize(size);
+
+  if (buf.size() == 0)
+    BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+
+  return buf;
+}
+
+void set(basic_cstring_ref<char_type,   key_char_traits<char_type>>   key,
+         basic_cstring_ref<char_type, value_char_traits<char_type>> value,
+         error_code & ec)
+{
+  if (!::SetEnvironmentVariableW(key.c_str(), value.c_str()))
+    BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+}
+
+void unset(basic_cstring_ref<char_type, key_char_traits<char_type>> key,
+           error_code & ec)
+{
+  if (!::SetEnvironmentVariableW(key.c_str(), nullptr))
+    BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+}
+
+
+std::basic_string<char, value_char_traits<char>> get(
+        basic_cstring_ref<char, key_char_traits<char>> key,
+        error_code & ec)
+{
+  std::basic_string<char, value_char_traits<char>> buf;
+
+  std::size_t size = 0u;
+  do
+  {
+    buf.resize(buf.size() + 4096);
+    size = ::GetEnvironmentVariableA(key.c_str(), &buf.front(), static_cast<DWORD>(buf.size()));
+  }
+  while (size == buf.size());
+
+  buf.resize(size);
+
+  if (buf.size() == 0)
+    BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+
+  return buf;
+}
+
+void set(basic_cstring_ref<char,   key_char_traits<char>>   key,
+         basic_cstring_ref<char, value_char_traits<char>> value,
+         error_code & ec)
+{
+  if (!::SetEnvironmentVariableA(key.c_str(), value.c_str()))
+    BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+}
+
+void unset(basic_cstring_ref<char, key_char_traits<char>> key,
+           error_code & ec)
+{
+  if (!::SetEnvironmentVariableA(key.c_str(), nullptr))
+    BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+}
+
+
+native_handle_type load_native_handle() { return ::GetEnvironmentStringsW(); }
+void native_handle_deleter::operator()(native_handle_type nh) const
+{
+    ::FreeEnvironmentStringsW(nh);
+}
+
+native_iterator next(native_iterator nh)
+{
+    while (*nh != L'\0')
+        nh++;
+    return ++nh;
+}
+
+
+native_iterator find_end(native_handle_type nh)
+{
+  while ((*nh != L'\0') || (*std::next(nh) != L'\0'))
+    nh++;
+  return ++nh;
+}
+
+bool is_executable(const filesystem::path & pth, error_code & ec)
+{
+    return filesystem::is_regular_file(pth, ec) && SHGetFileInfoW(pth.native().c_str(), 0,0,0, SHGFI_EXETYPE);
+}
+
+}
+}
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //BOOST_PROCESS_V2_DETAIL_IMPL_ENVIRONMENT_WIN_IPP

include/boost/process/v2/detail/impl/last_error.ipp

@@ -0,0 +1,34 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_IMPL_LAST_ERROR_IPP
+#define BOOST_PROCESS_V2_DETAIL_IMPL_LAST_ERROR_IPP
+
+#include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/detail/last_error.hpp>
+
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+#include <windows.h>
+#else
+#include <cerrno>
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+namespace detail
+{
+
+error_code get_last_error()
+{
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+    return error_code(::GetLastError(), system_category());
+#else
+    return error_code(errno, system_category());
+#endif
+
+}
+
+}
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //BOOST_PROCESS_V2_DETAIL_IMPL_LAST_ERROR_IPP

include/boost/process/v2/detail/impl/process_handle_windows.ipp

@@ -0,0 +1,169 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_IMPL_PROCESS_HANDLE_WINDOWS_IPP
+#define BOOST_PROCESS_V2_DETAIL_IMPL_PROCESS_HANDLE_WINDOWS_IPP
+
+#include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/detail/last_error.hpp>
+#include <boost/process/v2/detail/throw_error.hpp>
+#include <boost/process/v2/detail/process_handle_windows.hpp>
+#include <boost/process/v2/ext/detail/proc_info.hpp>
+
+#include <windows.h>
+
+#if !defined(BOOST_PROCESS_V2_DISABLE_UNDOCUMENTED_API)
+extern "C" 
+{
+
+LONG WINAPI NtResumeProcess(HANDLE ProcessHandle);
+LONG WINAPI NtSuspendProcess(HANDLE ProcessHandle);
+
+}
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace detail
+{
+
+void get_exit_code_(
+    HANDLE handle,
+    native_exit_code_type & exit_code, 
+    error_code & ec)
+{
+    if (!::GetExitCodeProcess(handle, &exit_code))
+        BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+}
+
+
+HANDLE open_process_(DWORD pid)
+{
+    auto proc = OpenProcess(PROCESS_TERMINATE | SYNCHRONIZE, FALSE, pid);
+    if (proc == nullptr)
+    {
+        error_code ec;
+        BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+        throw system_error(ec, "open_process()");
+    }
+
+    return proc;
+}
+
+
+void terminate_if_running_(HANDLE handle)
+{
+    DWORD exit_code = 0u;
+    if (handle == INVALID_HANDLE_VALUE)
+        return ;
+    if (::GetExitCodeProcess(handle, &exit_code))
+        if (exit_code == STILL_ACTIVE)
+            ::TerminateProcess(handle, 260);
+}
+
+bool check_handle_(HANDLE handle, error_code & ec)
+{
+    if (handle == INVALID_HANDLE_VALUE)
+    {
+        BOOST_PROCESS_V2_ASSIGN_EC(ec, ERROR_INVALID_HANDLE_STATE, system_category())
+        return false;
+    }
+    return true;
+}
+
+bool check_pid_(pid_type pid_, error_code & ec)
+{
+    if (pid_ == 0)
+    {
+        BOOST_PROCESS_V2_ASSIGN_EC(ec, ERROR_INVALID_HANDLE_STATE, system_category())
+        return false;
+    }
+    return true;
+}
+
+struct enum_windows_data_t
+{
+    error_code &ec;
+    pid_type pid;
+};
+
+static BOOL CALLBACK enum_window(HWND hwnd, LPARAM param)
+{
+    auto data = reinterpret_cast<enum_windows_data_t*>(param);
+    DWORD pid{0u};
+    GetWindowThreadProcessId(hwnd, &pid);
+    if (pid != data->pid)
+        return TRUE;
+    
+    LRESULT res = ::SendMessageW(hwnd, WM_CLOSE, 0, 0);
+
+    if (res)
+      BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(data->ec)
+    return res == 0;
+}
+
+void request_exit_(pid_type pid_, error_code & ec)
+{
+    enum_windows_data_t data{ec, pid_};
+
+    if (!::EnumWindows(enum_window, reinterpret_cast<LONG_PTR>(&data)))
+        BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+}
+
+void interrupt_(pid_type pid_, error_code & ec)
+{
+    if (!::GenerateConsoleCtrlEvent(CTRL_C_EVENT, pid_))
+        BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+}
+
+void terminate_(HANDLE handle, error_code & ec, DWORD & exit_status)
+{
+    if (!::TerminateProcess(handle, 260))
+        BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+}
+
+void check_running_(HANDLE handle, error_code & ec, DWORD & exit_status)
+{
+    if (!::GetExitCodeProcess(handle, &exit_status))
+        BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+}
+
+#if !defined(BOOST_PROCESS_V2_DISABLE_UNDOCUMENTED_API)
+void suspend_(HANDLE handle, error_code & ec)
+{
+    auto nt_err = NtSuspendProcess(handle);
+    ULONG dos_err = RtlNtStatusToDosError(nt_err);
+    if (dos_err)
+       BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+}
+
+void resume_(HANDLE handle, error_code & ec)
+{
+    auto nt_err = NtResumeProcess(handle);
+    ULONG dos_err = RtlNtStatusToDosError(nt_err);
+    if (dos_err)
+        BOOST_PROCESS_V2_ASSIGN_LAST_ERROR(ec)
+}
+#else
+void suspend_(HANDLE, error_code & ec)
+{
+    BOOST_PROCESS_V2_ASSIGN_EC(ec, ERROR_CALL_NOT_IMPLEMENTED, system_category())
+}
+
+void resume_(HANDLE handle, error_code & ec)
+{
+    BOOST_PROCESS_V2_ASSIGN_EC(ec, ERROR_CALL_NOT_IMPLEMENTED, system_category())
+}
+#endif
+
+#if !defined(BOOST_PROCESS_V2_HEADER_ONLY)
+template struct basic_process_handle_win<>;
+#endif
+
+}
+
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //BOOST_PROCESS_V2_DETAIL_IMPL_PROCESS_HANDLE_WINDOWS_IPP

include/boost/process/v2/detail/impl/throw_error.ipp

@@ -0,0 +1,31 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_IMPL_THROW_ERROR_IPP
+#define BOOST_PROCESS_V2_DETAIL_IMPL_THROW_ERROR_IPP
+
+#include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/detail/throw_error.hpp>
+#include <boost/process/v2/detail/throw_exception.hpp>
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+namespace detail
+{
+
+void do_throw_error(const error_code& err)
+{
+    system_error e(err);
+    throw_exception(e);
+}
+
+void do_throw_error(const error_code& err, const char* location)
+{
+    system_error e(err, location);
+    throw_exception(e);
+}
+
+}
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //BOOST_PROCESS_V2_DETAIL_IMPL_THROW_ERROR_IPP

include/boost/process/v2/detail/impl/utf8.ipp

@@ -0,0 +1,379 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_IMPL_UTF8_HPP
+#define BOOST_PROCESS_V2_DETAIL_IMPL_UTF8_HPP
+
+#include <boost/process/v2/detail/utf8.hpp>
+#include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/detail/last_error.hpp>
+#include <boost/process/v2/error.hpp>
+
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+#include <Windows.h>
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace detail
+{
+
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+
+inline void handle_error(error_code & ec)
+{
+    const auto err = ::GetLastError();
+    switch (err)
+    {
+    case ERROR_INSUFFICIENT_BUFFER:
+        BOOST_PROCESS_V2_ASSIGN_EC(ec, error::insufficient_buffer, error::utf8_category)
+        break;
+    case ERROR_NO_UNICODE_TRANSLATION:
+        BOOST_PROCESS_V2_ASSIGN_EC(ec, error::invalid_character, error::utf8_category)
+        break;
+    default:
+        BOOST_PROCESS_V2_ASSIGN_EC(ec, err, system_category())
+    }
+}
+
+std::size_t size_as_utf8(const wchar_t * in, std::size_t size, error_code & ec)
+{
+    auto res = WideCharToMultiByte(
+                          CP_UTF8,                // CodePage,
+                          0,                      // dwFlags,
+                          in,                     // lpWideCharStr,
+                          static_cast<int>(size), // cchWideChar,
+                          nullptr,                // lpMultiByteStr,
+                          0,                      // cbMultiByte,
+                          nullptr,                // lpDefaultChar,
+                          FALSE);                 // lpUsedDefaultChar
+    
+    if (res == 0u)
+        handle_error(ec);
+    return static_cast<std::size_t>(res);
+}
+
+std::size_t size_as_wide(const char * in, std::size_t size, error_code & ec)
+{
+    auto res = ::MultiByteToWideChar(
+                          CP_UTF8,                // CodePage
+                          0,                      // dwFlags
+                          in,                     // lpMultiByteStr
+                          static_cast<int>(size), // cbMultiByte
+                          nullptr,                // lpWideCharStr
+                          0);                     // cchWideChar
+    if (res == 0u)
+        handle_error(ec);
+
+    return static_cast<std::size_t>(res);
+}
+
+std::size_t convert_to_utf8(const wchar_t *in, std::size_t size,  char * out, 
+                            std::size_t max_size, error_code & ec)
+{
+    auto res = ::WideCharToMultiByte(
+                    CP_UTF8,                    // CodePage
+                    0,                          // dwFlags
+                    in,                         // lpWideCharStr
+                    static_cast<int>(size),     // cchWideChar
+                    out,                        // lpMultiByteStr
+                    static_cast<int>(max_size), // cbMultiByte
+                    nullptr,                    // lpDefaultChar
+                    FALSE);                     // lpUsedDefaultChar
+    if (res == 0u)
+        handle_error(ec);
+
+    return static_cast<std::size_t>(res);
+}
+
+std::size_t convert_to_wide(const char *in, std::size_t size,  wchar_t * out, 
+                            std::size_t max_size, error_code & ec)
+{
+    auto res = ::MultiByteToWideChar(
+                          CP_UTF8,                     // CodePage
+                          0,                           // dwFlags
+                          in,                          // lpMultiByteStr
+                          static_cast<int>(size),      // cbMultiByte
+                          out,                         // lpWideCharStr
+                          static_cast<int>(max_size)); // cchWideChar
+    if (res == 0u)
+        handle_error(ec);
+
+    return static_cast<std::size_t>(res);
+}
+
+#else
+
+
+template<std::size_t s>
+inline int get_cont_octet_out_count_impl(wchar_t word) {
+    if (word < 0x80) {
+        return 0;
+    }
+    if (word < 0x800) {
+        return 1;
+    }
+    return 2;
+}
+
+template<>
+inline int get_cont_octet_out_count_impl<4>(wchar_t word) {
+    if (word < 0x80) {
+        return 0;
+    }
+    if (word < 0x800) {
+        return 1;
+    }
+
+    // Note that the following code will generate warnings on some platforms
+    // where wchar_t is defined as UCS2.  The warnings are superfluous as the
+    // specialization is never instantiated with such compilers, but this
+    // can cause problems if warnings are being treated as errors, so we guard
+    // against that. Including <boost/detail/utf8_codecvt_facet.hpp> as we do
+    // should be enough to get WCHAR_MAX defined.
+#if !defined(WCHAR_MAX)
+#   error WCHAR_MAX not defined!
+#endif
+    // cope with VC++ 7.1 or earlier having invalid WCHAR_MAX
+#if defined(_MSC_VER) && _MSC_VER <= 1310 // 7.1 or earlier
+    return 2;
+#elif WCHAR_MAX > 0x10000
+
+    if (word < 0x10000) {
+        return 2;
+    }
+    if (word < 0x200000) {
+        return 3;
+    }
+    if (word < 0x4000000) {
+        return 4;
+    }
+    return 5;
+
+#else
+    return 2;
+#endif
+}
+
+inline int get_cont_octet_out_count(wchar_t word)
+{
+    return detail::get_cont_octet_out_count_impl<sizeof(wchar_t)>(word);
+}
+
+// copied from boost/detail/utf8_codecvt_facet.ipp
+// Copyright (c) 2001 Ronald Garcia, Indiana University (garcia@osl.iu.edu)
+// Andrew Lumsdaine, Indiana University (lums@osl.iu.edu).
+
+inline unsigned int get_octet_count(unsigned char lead_octet)
+{
+    // if the 0-bit (MSB) is 0, then 1 character
+    if (lead_octet <= 0x7f) return 1;
+
+    // Otherwise the count number of consecutive 1 bits starting at MSB
+//    assert(0xc0 <= lead_octet && lead_octet <= 0xfd);
+
+    if (0xc0 <= lead_octet && lead_octet <= 0xdf) return 2;
+    else if (0xe0 <= lead_octet && lead_octet <= 0xef) return 3;
+    else if (0xf0 <= lead_octet && lead_octet <= 0xf7) return 4;
+    else if (0xf8 <= lead_octet && lead_octet <= 0xfb) return 5;
+    else return 6;
+}
+
+inline bool invalid_continuing_octet(unsigned char octet_1) {
+    return (octet_1 < 0x80|| 0xbf< octet_1);
+}
+
+inline unsigned int get_cont_octet_count(unsigned char lead_octet)
+{
+    return get_octet_count(lead_octet) - 1;
+}
+
+inline const wchar_t * get_octet1_modifier_table() noexcept
+{
+    static const wchar_t octet1_modifier_table[] = {
+        0x00, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc
+    };
+    return octet1_modifier_table;
+}
+
+
+std::size_t size_as_utf8(const wchar_t * in, std::size_t size, error_code & ec)
+{
+    std::size_t res = 0u;
+    const auto from_end = in + size;
+    for (auto from = in; from != from_end; from++)
+        res += get_cont_octet_out_count(*from) + 1;
+    return res;
+}
+
+std::size_t size_as_wide(const  char   * in, std::size_t size, error_code & ec)
+{
+    const auto from = in;
+    const auto from_end = from + size;
+    const char * from_next = from;
+    for (std::size_t char_count = 0u; from_next < from_end; ++char_count) {
+        unsigned int octet_count = get_octet_count(*from_next);
+        // The buffer may represent incomplete characters, so terminate early if one is found
+        if (octet_count > static_cast<std::size_t>(from_end - from_next))
+            break;
+        from_next += octet_count;
+    }
+
+    return from_next - from;
+}
+
+std::size_t convert_to_utf8(const wchar_t * in, std::size_t size,
+                            char   * out, std::size_t max_size, error_code & ec)
+{
+
+    const wchar_t * from = in;
+    const wchar_t * from_end = from + size;
+    const wchar_t * & from_next = from;
+    char * to = out;
+    char * to_end = out + max_size;
+    char * & to_next = to;
+
+    const wchar_t * const octet1_modifier_table = get_octet1_modifier_table();
+    wchar_t max_wchar = (std::numeric_limits<wchar_t>::max)();
+    while (from != from_end && to != to_end) {
+
+        // Check for invalid UCS-4 character
+        if (*from  > max_wchar) {
+            from_next = from;
+            to_next = to;
+            BOOST_PROCESS_V2_ASSIGN_EC(ec, error::invalid_character, error::get_utf8_category())
+            return 0u;
+        }
+
+        int cont_octet_count = get_cont_octet_out_count(*from);
+
+        // RG - comment this formula better
+        int shift_exponent = cont_octet_count * 6;
+
+        // Process the first character
+        *to++ = static_cast<char>(octet1_modifier_table[cont_octet_count] +
+                                  (unsigned char)(*from / (1 << shift_exponent)));
+
+        // Process the continuation characters
+        // Invariants: At the start of the loop:
+        //   1) 'i' continuing octets have been generated
+        //   2) '*to' points to the next location to place an octet
+        //   3) shift_exponent is 6 more than needed for the next octet
+        int i = 0;
+        while (i != cont_octet_count && to != to_end) {
+            shift_exponent -= 6;
+            *to++ = static_cast<char>(0x80 + ((*from / (1 << shift_exponent)) % (1 << 6)));
+            ++i;
+        }
+        // If we filled up the out buffer before encoding the character
+        if (to == to_end && i != cont_octet_count) {
+            from_next = from;
+            to_next = to - (i + 1);
+            BOOST_PROCESS_V2_ASSIGN_EC(ec, error::insufficient_buffer, error::get_utf8_category())
+            return 0u;
+        }
+        ++from;
+    }
+    from_next = from;
+    to_next = to;
+
+    // Were we done or did we run out of destination space
+    if (from != from_end)
+        BOOST_PROCESS_V2_ASSIGN_EC(ec, error::insufficient_buffer, error::get_utf8_category())
+
+    return to_next - out;
+}
+
+inline bool invalid_leading_octet(unsigned char octet_1) {
+    return (0x7f < octet_1 && octet_1 < 0xc0) ||
+           (octet_1 > 0xfd);
+}
+
+std::size_t convert_to_wide(const  char   * in, std::size_t size,
+                            wchar_t * out, std::size_t max_size, error_code & ec)
+{
+    const char * from = in;
+    const char * from_end = from + size;
+    const char * & from_next = from;
+    wchar_t * to = out;
+    wchar_t * to_end = out + max_size;
+    wchar_t * & to_next = to;
+
+    // Basic algorithm: The first octet determines how many
+    // octets total make up the UCS-4 character. The remaining
+    // "continuing octets" all begin with "10". To convert, subtract
+    // the amount that specifies the number of octets from the first
+    // octet. Subtract 0x80 (1000 0000) from each continuing octet,
+    // then mash the whole lot together. Note that each continuing
+    // octet only uses 6 bits as unique values, so only shift by
+    // multiples of 6 to combine.
+    const wchar_t * const octet1_modifier_table = detail::get_octet1_modifier_table();
+    while (from != from_end && to != to_end) {
+
+        // Error checking on the first octet
+        if (invalid_leading_octet(*from)) {
+            from_next = from;
+            to_next = to;
+            BOOST_PROCESS_V2_ASSIGN_EC(ec, error::invalid_character, error::get_utf8_category())
+            return 0u;
+        }
+
+        // The first octet is adjusted by a value dependent upon
+        // the number of "continuing octets" encoding the character
+        const int cont_octet_count = get_cont_octet_count(*from);
+
+        // The unsigned char conversion is necessary in case char is
+        // signed (I learned this the hard way)
+        wchar_t ucs_result =
+                (unsigned char)(*from++) - octet1_modifier_table[cont_octet_count];
+
+        // Invariants:
+        //   1) At the start of the loop, 'i' continuing characters have been
+        //      processed
+        //   2) *from points to the next continuing character to be processed.
+        int i = 0;
+        while (i != cont_octet_count && from != from_end) {
+
+            // Error checking on continuing characters
+            if (invalid_continuing_octet(*from)) {
+                from_next = from;
+                to_next = to;
+                BOOST_PROCESS_V2_ASSIGN_EC(ec, error::invalid_character, error::get_utf8_category())
+                return 0u;
+            }
+
+            ucs_result *= (1 << 6);
+
+            // each continuing character has an extra (10xxxxxx)b attached to
+            // it that must be removed.
+            ucs_result += (unsigned char)(*from++) - 0x80;
+            ++i;
+        }
+
+        // If the buffer ends with an incomplete unicode character...
+        if (from == from_end && i != cont_octet_count) {
+            // rewind "from" to before the current character translation
+            from_next = from - (i + 1);
+            to_next = to;
+            BOOST_PROCESS_V2_ASSIGN_EC(ec, error::insufficient_buffer, error::get_utf8_category())
+            return 0u;
+        }
+        *to++ = ucs_result;
+    }
+    from_next = from;
+    to_next = to;
+
+    if (from != from_end)
+        BOOST_PROCESS_V2_ASSIGN_EC(ec, error::insufficient_buffer, error::get_utf8_category())
+
+    return to_next - out;
+}
+
+#endif
+
+}
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //BOOST_PROCESS_V2_DETAIL_IMPL_UTF8_HPP

include/boost/process/v2/detail/last_error.hpp

@@ -0,0 +1,28 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_LAST_ERROR_HPP
+#define BOOST_PROCESS_V2_DETAIL_LAST_ERROR_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace detail
+{
+
+BOOST_PROCESS_V2_DECL error_code get_last_error();
+
+}
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#if defined(BOOST_PROCESS_V2_HEADER_ONLY)
+
+#include <boost/process/v2/detail/impl/last_error.ipp>
+
+#endif
+
+
+#endif //BOOST_PROCESS_V2_DETAIL_LAST_ERROR_HPP

include/boost/process/v2/detail/process_handle_fd.hpp

@@ -0,0 +1,355 @@
+
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_PROCESS_HANDLE_FD_HPP
+#define BOOST_PROCESS_V2_DETAIL_PROCESS_HANDLE_FD_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/syscall.h>
+
+#include <boost/process/v2/detail/last_error.hpp>
+#include <boost/process/v2/detail/throw_error.hpp>
+#include <boost/process/v2/exit_code.hpp>
+#include <boost/process/v2/pid.hpp>
+
+#if defined(BOOST_PROCESS_V2_STANDALONE)
+#include <asio/any_io_executor.hpp>
+#include <asio/compose.hpp>
+#include <asio/posix/basic_stream_descriptor.hpp>
+#include <asio/post.hpp>
+#else
+#include <boost/asio/any_io_executor.hpp>
+#include <boost/asio/compose.hpp>
+#include <boost/asio/posix/basic_stream_descriptor.hpp>
+#include <boost/asio/post.hpp>
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace detail
+{
+
+template<typename Executor = BOOST_PROCESS_V2_ASIO_NAMESPACE::any_io_executor>
+struct basic_process_handle_fd
+{
+    using native_handle_type = int;
+    
+    typedef Executor executor_type;
+
+    executor_type get_executor()
+    { return descriptor_.get_executor(); }
+
+    /// Rebinds the process_handle to another executor.
+    template<typename Executor1>
+    struct rebind_executor
+    {
+        /// The socket type when rebound to the specified executor.
+        typedef basic_process_handle_fd<Executor1> other;
+    };
+
+    template<typename ExecutionContext>
+    basic_process_handle_fd(ExecutionContext &context,
+                            typename std::enable_if<
+                                std::is_convertible<ExecutionContext &,
+                                    BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context &>::value>::type * = nullptr)
+            : pid_(-1), descriptor_(context)
+    {
+    }
+
+    basic_process_handle_fd(executor_type executor)
+            : pid_(-1), descriptor_(executor)
+    {
+    }
+
+    basic_process_handle_fd(executor_type executor, pid_type pid)
+            : pid_(pid), descriptor_(executor, syscall(SYS_pidfd_open, pid, 0))
+    {
+    }
+
+    basic_process_handle_fd(executor_type executor, pid_type pid, native_handle_type process_handle)
+            : pid_(pid), descriptor_(executor, process_handle)
+    {
+    }
+
+    basic_process_handle_fd(basic_process_handle_fd &&handle)
+            : pid_(handle.pid_), descriptor_(std::move(handle.descriptor_))
+    {
+        handle.pid_ = -1;
+    }
+
+    template<typename Executor1>
+    basic_process_handle_fd(basic_process_handle_fd<Executor1> &&handle)
+            : pid_(handle.pid_), descriptor_(std::move(handle.descriptor_))
+    {
+        handle.pid_ = -1;
+    }
+
+
+    basic_process_handle_fd& operator=(basic_process_handle_fd &&handle)
+    {
+        pid_ = handle.pid_;
+        descriptor_ = std::move(handle.descriptor_);
+        handle.pid_ = -1;
+        return *this;
+    }
+
+    pid_type id() const
+    { return pid_; }
+
+    native_handle_type native_handle() {return pid_;}
+
+    void terminate_if_running(error_code &)
+    {
+        if (pid_ <= 0)
+            return;
+        if (::waitpid(pid_, nullptr, WNOHANG) == 0)
+        {
+            ::kill(pid_, SIGKILL);
+            ::waitpid(pid_, nullptr, 0);
+        }
+    }
+
+    void terminate_if_running()
+    {
+        if (pid_ <= 0)
+            return;
+        if (::waitpid(pid_, nullptr, WNOHANG) == 0)
+        {
+            ::kill(pid_, SIGKILL);
+            ::waitpid(pid_, nullptr, 0);
+        }
+    }
+
+    void wait(native_exit_code_type &exit_status, error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        while (::waitpid(pid_, &exit_status, 0) < 0)
+        {
+            if (errno != EINTR)
+            {
+                ec = get_last_error();
+                break;
+            }   
+        }
+    }
+
+    void wait(native_exit_code_type &exit_status)
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        wait(exit_status, ec);
+        if (ec)
+            detail::throw_error(ec, "wait(pid)");
+    }
+
+    void interrupt(error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        if (::kill(pid_, SIGINT) == -1)
+            ec = get_last_error();
+    }
+
+    void interrupt()
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        interrupt(ec);
+        if (ec)
+            detail::throw_error(ec, "interrupt");
+    }
+
+    void request_exit(error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        if (::kill(pid_, SIGTERM) == -1)
+            ec = get_last_error();
+    }
+
+    void request_exit()
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        request_exit(ec);
+        if (ec)
+            detail::throw_error(ec, "request_exit");
+    }
+    
+    void suspend()
+    {
+        if (pid_ <= 0)
+            return ;
+        error_code ec;
+        suspend(ec);
+        if (ec)
+            detail::throw_error(ec, "suspend");
+    }
+
+    void suspend(error_code &ec)
+    {
+        if (pid_ <= 0)
+            return ;
+        if (::kill(pid_, SIGSTOP) == -1)
+            ec = get_last_error();
+    }
+
+    void resume()
+    {
+        if (pid_ <= 0)
+            return ;
+        error_code ec;
+        resume(ec);
+        if (ec)
+            detail::throw_error(ec, "resume");
+    }
+
+    void resume(error_code &ec)
+    {
+        if (pid_ <= 0)
+            return ;
+        if (::kill(pid_, SIGCONT) == -1)
+            ec = get_last_error();
+    }
+    void terminate(native_exit_code_type &exit_status, error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        if (::kill(pid_, SIGKILL) == -1)
+            ec = get_last_error();
+    }
+
+    void terminate(native_exit_code_type &exit_status)
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        terminate(exit_status, ec);
+        if (ec)
+            detail::throw_error(ec, "terminate");
+    }
+
+    bool running(native_exit_code_type &exit_code, error_code & ec)
+    {
+        if (pid_ <= 0)
+            return false;
+        int code = 0;
+        int res = ::waitpid(pid_, &code, WNOHANG);
+        if (res == -1)
+            ec = get_last_error();
+        else if (res == 0)
+            return true;
+        else
+            ec.clear();
+
+        if (res == 0)
+            return true;
+        else
+        {
+            exit_code = code;
+            return false;
+        }
+    }
+
+    bool running(native_exit_code_type &exit_code)
+    {
+        if (pid_ <= 0)
+            return false;
+
+        error_code ec;
+        bool res = running(exit_code, ec);
+        if (ec)
+            detail::throw_error(ec, "is_running");
+        return res;
+    }
+
+    bool is_open() const
+    {
+        return pid_ != -1;
+    }
+
+    template<BOOST_PROCESS_V2_COMPLETION_TOKEN_FOR(void(error_code, native_exit_code_type))
+    WaitHandler BOOST_PROCESS_V2_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+    BOOST_PROCESS_V2_INITFN_AUTO_RESULT_TYPE(WaitHandler, void (error_code, native_exit_code_type))
+    async_wait(WaitHandler &&handler BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+    {
+        return BOOST_PROCESS_V2_ASIO_NAMESPACE::async_compose<WaitHandler, void(error_code, native_exit_code_type)>(
+                async_wait_op_{descriptor_, pid_}, handler, descriptor_);
+    }
+
+  private:
+    template<typename>
+    friend
+    struct basic_process_handle_fd;
+    pid_type pid_ = -1;
+    BOOST_PROCESS_V2_ASIO_NAMESPACE::posix::basic_stream_descriptor<Executor> descriptor_;
+
+    struct async_wait_op_
+    {
+        BOOST_PROCESS_V2_ASIO_NAMESPACE::posix::basic_descriptor<Executor> &descriptor;
+        pid_type pid_;
+
+        template<typename Self>
+        void operator()(Self &&self)
+        {
+            error_code ec;
+            native_exit_code_type exit_code{};
+            int wait_res = -1;
+            if (pid_ <= 0) // error, complete early
+                ec = BOOST_PROCESS_V2_ASIO_NAMESPACE::error::bad_descriptor;
+            else 
+            {
+                wait_res = ::waitpid(pid_, &exit_code, WNOHANG);
+                if (wait_res == -1)
+                    ec = get_last_error();
+            }
+            
+
+            if (!ec && (wait_res == 0))
+            {
+                descriptor.async_wait(
+                        BOOST_PROCESS_V2_ASIO_NAMESPACE::posix::descriptor_base::wait_read, std::move(self));
+                return;
+            }
+
+            struct completer
+            {
+                error_code ec;
+                native_exit_code_type code;
+                typename std::decay<Self>::type self;
+
+                void operator()()
+                {
+                    self.complete(ec, code);
+                }
+            };
+            BOOST_PROCESS_V2_ASIO_NAMESPACE::post(descriptor.get_executor(),
+                                                  completer{ec, exit_code, std::move(self)});
+
+        }
+
+        template<typename Self>
+        void operator()(Self &&self, error_code ec, int = 0)
+        {
+            native_exit_code_type exit_code{};
+            if (!ec)
+                if (::waitpid(pid_, &exit_code, 0) == -1)
+                    ec = get_last_error();
+            std::move(self).complete(ec, exit_code);
+        }
+    };
+};
+}
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //BOOST_PROCESS_HANDLE_FD_OR_SIGNAL_HPP

include/boost/process/v2/detail/process_handle_fd_or_signal.hpp

@@ -0,0 +1,383 @@
+
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_PROCESS_HANDLE_FD_OR_SIGNAL_HPP
+#define BOOST_PROCESS_V2_DETAIL_PROCESS_HANDLE_FD_OR_SIGNAL_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <boost/process/v2/detail/last_error.hpp>
+#include <boost/process/v2/detail/throw_error.hpp>
+#include <boost/process/v2/exit_code.hpp>
+#include <boost/process/v2/pid.hpp>
+
+#if defined(BOOST_PROCESS_V2_STANDALONE)
+#include <asio/any_io_executor.hpp>
+#include <asio/compose.hpp>
+#include <asio/dispatch.hpp>
+#include <asio/posix/basic_stream_descriptor.hpp>
+#include <asio/post.hpp>
+#include <asio/windows/signal_set.hpp>
+#else
+#include <boost/asio/any_io_executor.hpp>
+#include <boost/asio/compose.hpp>
+#include <boost/asio/dispatch.hpp>
+#include <boost/asio/posix/basic_stream_descriptor.hpp>
+#include <boost/asio/post.hpp>
+#include <boost/asio/signal_set.hpp>
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace detail
+{
+
+template<typename Executor = BOOST_PROCESS_V2_ASIO_NAMESPACE::any_io_executor>
+struct basic_process_handle_fd_or_signal
+{
+    using native_handle_type = int;
+    
+    typedef Executor executor_type;
+
+    executor_type get_executor()
+    { return signal_set_.get_executor(); }
+
+    /// Rebinds the process_handle to another executor.
+    template<typename Executor1>
+    struct rebind_executor
+    {
+        /// The socket type when rebound to the specified executor.
+        typedef basic_process_handle_fd_or_signal<Executor1> other;
+    };
+
+    template<typename ExecutionContext>
+    basic_process_handle_fd_or_signal(ExecutionContext &context,
+                                typename std::enable_if<
+                                        std::is_convertible<ExecutionContext &,
+                                                BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context &>::value
+                                >::type * = nullptr)
+            : pid_(-1), descriptor_(context)
+    {
+    }
+
+    template<typename ExecutionContext>
+    basic_process_handle_fd_or_signal(ExecutionContext &context,
+                                      pid_type pid,
+                                      typename std::enable_if<
+                                          std::is_convertible<ExecutionContext &,
+                                              BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context &>::value
+                                          >::type * = nullptr)
+            : pid_(pid), descriptor_(context)
+    {
+    }
+    
+    template<typename ExecutionContext>
+    basic_process_handle_fd_or_signal(ExecutionContext &context,
+                                      pid_type pid, native_handle_type process_handle,
+                                      typename std::enable_if<
+                                          std::is_convertible<ExecutionContext &,
+                                              BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context &>::value
+                                          >::type * = nullptr)
+            : pid_(pid), descriptor_(context, process_handle)
+    {
+    }
+    
+
+    basic_process_handle_fd_or_signal(Executor executor)
+            : pid_(-1), descriptor_(executor)
+    {
+    }
+
+    basic_process_handle_fd_or_signal(Executor executor, pid_type pid)
+            : pid_(pid), descriptor_(executor)
+    {
+    }
+
+    basic_process_handle_fd_or_signal(Executor executor, pid_type pid, native_handle_type process_handle)
+            : pid_(pid), descriptor_(executor, process_handle)
+    {
+    }
+
+
+    basic_process_handle_fd_or_signal(basic_process_handle_fd_or_signal &&handle)
+            : pid_(handle.pid_), descriptor_(std::move(handle.descriptor_))
+    {
+        handle.pid_ = -1;
+    }
+    // Warn: does not change the executor of the signal-set.
+    basic_process_handle_fd_or_signal& operator=(basic_process_handle_fd_or_signal &&handle)
+    {
+        pid_ = handle.pid_;
+        descriptor_ = std::move(handle.descriptor_);
+        handle.pid_ = -1;
+        return *this;
+    }
+
+
+    template<typename Executor1>
+    basic_process_handle_fd_or_signal(basic_process_handle_fd_or_signal<Executor1> &&handle)
+            : pid_(handle.pid_), descriptor_(std::move(handle.descriptor_))
+    {
+        handle.pid_ = -1;
+    }
+
+    pid_type id() const
+    { return pid_; }
+    native_handle_type native_handle() {return pid_;}
+
+    void terminate_if_running(error_code &)
+    {
+        if (pid_ <= 0)
+            return;
+        if (::waitpid(pid_, nullptr, WNOHANG) == 0)
+        {
+            ::kill(pid_, SIGKILL);
+            ::waitpid(pid_, nullptr, 0);
+        }
+    }
+
+    void terminate_if_running()
+    {
+        if (pid_ <= 0)
+            return;
+        if (::waitpid(pid_, nullptr, WNOHANG) == 0)
+        {
+            ::kill(pid_, SIGKILL);
+            ::waitpid(pid_, nullptr, 0);
+        }
+    }
+
+    void wait(native_exit_code_type &exit_status, error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        while (::waitpid(pid_, &exit_status, 0) < 0)
+        {
+            if (errno != EINTR)
+            {
+                ec = get_last_error();
+                break;
+            }               
+        }
+            
+    }
+
+    void wait(native_exit_code_type &exit_status)
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        wait(exit_status, ec);
+        if (ec)
+            detail::throw_error(ec, "wait(pid)");
+    }
+
+    void interrupt(error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        if (::kill(pid_, SIGINT) == -1)
+            ec = get_last_error();
+    }
+
+    void interrupt()
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        interrupt(ec);
+        if (ec)
+            detail::throw_error(ec, "interrupt");
+    }
+
+    void request_exit(error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        if (::kill(pid_, SIGTERM) == -1)
+            ec = get_last_error();
+    }
+
+    void request_exit()
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        request_exit(ec);
+        if (ec)
+            detail::throw_error(ec, "request_exit");
+    }
+    
+    void suspend()
+    {
+        if (pid_ <= 0)
+            return ;
+        error_code ec;
+        suspend(ec);
+        if (ec)
+            detail::throw_error(ec, "suspend");
+    }
+
+    void suspend(error_code &ec)
+    {
+        if (pid_ <= 0)
+            return ;
+        if (::kill(pid_, SIGSTOP) == -1)
+            ec = get_last_error();
+    }
+
+    void resume()
+    {
+        if (pid_ <= 0)
+            return ;
+        error_code ec;
+        resume(ec);
+        if (ec)
+            detail::throw_error(ec, "resume");
+    }
+
+    void resume(error_code &ec)
+    {
+        if (pid_ <= 0)
+            return ;
+        if (::kill(pid_, SIGCONT) == -1)
+            ec = get_last_error();
+    }
+
+    void terminate(native_exit_code_type &exit_status, error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        if (::kill(pid_, SIGKILL) == -1)
+            ec = get_last_error();
+    }
+
+    void terminate(native_exit_code_type &exit_status)
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        terminate(exit_status, ec);
+        if (ec)
+            detail::throw_error(ec, "terminate");
+    }
+
+    bool running(native_exit_code_type &exit_code, error_code & ec)
+    {
+        if (pid_ <= 0)
+            return false;
+        int code = 0;
+        int res = ::waitpid(pid_, &code, WNOHANG);
+        if (res == -1)
+            ec = get_last_error();
+        else
+            ec.clear();
+
+        if (process_is_running(res))
+            return true;
+        else
+        {
+            exit_code = code;
+            return false;
+        }
+    }
+
+    bool running(native_exit_code_type &exit_code)
+    {
+        if (pid_ <= 0)
+            return false;
+
+        error_code ec;
+        bool res = running(exit_code, ec);
+        if (ec)
+            detail::throw_error(ec, "is_running");
+        return res;
+    }
+
+    bool is_open() const
+    {
+        return pid_ != -1;
+    }
+
+    template<BOOST_PROCESS_V2_COMPLETION_TOKEN_FOR(void(error_code, int))
+    WaitHandler BOOST_PROCESS_V2_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+    BOOST_PROCESS_V2_INITFN_AUTO_RESULT_TYPE(WaitHandler, void (error_code, native_exit_code_type))
+    async_wait(WaitHandler &&handler BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+    {
+        return BOOST_PROCESS_V2_ASIO_NAMESPACE::async_compose<WaitHandler, void(error_code, native_exit_code_type)>(
+                async_wait_op_{descriptor_, signal_set_, pid_}, handler, descriptor_);
+    }
+
+  private:
+    template<typename>
+    friend
+    struct basic_process_handle_fd_or_signal;
+    pid_type pid_ = -1;
+    BOOST_PROCESS_V2_ASIO_NAMESPACE::posix::basic_stream_descriptor<Executor> descriptor_;
+    BOOST_PROCESS_V2_ASIO_NAMESPACE::basic_signal_set<Executor> signal_set_{descriptor_.get_executor(), SIGCHLD};
+
+    struct async_wait_op_
+    {
+        BOOST_PROCESS_V2_ASIO_NAMESPACE::posix::basic_descriptor<Executor> &descriptor;
+        BOOST_PROCESS_V2_ASIO_NAMESPACE::basic_signal_set<Executor> &handle;
+        pid_type pid_;
+        bool needs_post = true;
+
+        template<typename Self>
+        void operator()(Self &&self, error_code ec = {}, int = 0)
+        {
+            native_exit_code_type exit_code{};
+            int wait_res = -1;
+            if (pid_ <= 0) // error, complete early
+                ec = BOOST_PROCESS_V2_ASIO_NAMESPACE::error::bad_descriptor;
+            else 
+            {
+                wait_res = ::waitpid(pid_, &exit_code, WNOHANG);
+                if (wait_res == -1)
+                    ec = get_last_error();
+            }
+
+            if (!ec && (wait_res == 0))
+            {
+                needs_post = false;
+                if (descriptor.is_open())
+                    descriptor.async_wait(
+                            BOOST_PROCESS_V2_ASIO_NAMESPACE::posix::descriptor_base::wait_read, 
+                            std::move(self));
+                else
+                    handle.async_wait(std::move(self));
+                return;
+            }
+
+            struct completer
+            {
+                error_code ec;
+                native_exit_code_type code;
+                typename std::decay<Self>::type self;
+
+                void operator()()
+                {
+                    self.complete(ec, code);
+                }
+            };
+
+            const auto exec = self.get_executor();
+            completer cpl{ec, exit_code, std::move(self)};
+            if (needs_post)
+                BOOST_PROCESS_V2_ASIO_NAMESPACE::post(exec, std::move(cpl));
+            else
+                BOOST_PROCESS_V2_ASIO_NAMESPACE::dispatch(exec, std::move(cpl));
+
+        }
+    };
+};
+}
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //BOOST_PROCESS_HANDLE_FD_OR_SIGNAL_HPP

include/boost/process/v2/detail/process_handle_signal.hpp

@@ -0,0 +1,350 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_PROCESS_HANDLE_SIGNAL_HPP
+#define BOOST_PROCESS_V2_DETAIL_PROCESS_HANDLE_SIGNAL_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <boost/process/v2/detail/last_error.hpp>
+#include <boost/process/v2/detail/throw_error.hpp>
+#include <boost/process/v2/exit_code.hpp>
+#include <boost/process/v2/pid.hpp>
+
+#if defined(BOOST_PROCESS_V2_STANDALONE)
+#include <asio/any_io_executor.hpp>
+#include <asio/compose.hpp>
+#include <asio/dispatch.hpp>
+#include <asio/post.hpp>
+#include <asio/signal_set.hpp>
+#else
+#include <boost/asio/any_io_executor.hpp>
+#include <boost/asio/compose.hpp>
+#include <boost/asio/dispatch.hpp>
+#include <boost/asio/post.hpp>
+#include <boost/asio/signal_set.hpp>
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace detail
+{
+
+template<typename Executor = BOOST_PROCESS_V2_ASIO_NAMESPACE::any_io_executor>
+struct basic_process_handle_signal
+{
+    struct native_handle_type
+    {
+         native_handle_type() = delete;
+         native_handle_type(const native_handle_type & ) = delete;
+        ~native_handle_type() = default;
+    };
+
+    typedef Executor executor_type;
+
+    executor_type get_executor()
+    { return signal_set_.get_executor(); }
+
+    /// Rebinds the process_handle to another executor.
+    template<typename Executor1>
+    struct rebind_executor
+    {
+        /// The socket type when rebound to the specified executor.
+        typedef basic_process_handle_signal<Executor1> other;
+    };
+
+    template<typename ExecutionContext>
+    basic_process_handle_signal(ExecutionContext &context,
+                         typename std::enable_if<
+                                 std::is_convertible<ExecutionContext &,
+                                         BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context &>::value
+                         >::type * = nullptr)
+            : pid_(-1), signal_set_(context, SIGCHLD)
+    {
+    }
+
+    basic_process_handle_signal(Executor executor)
+            : pid_(-1), signal_set_(executor, SIGCHLD)
+    {
+    }
+
+    basic_process_handle_signal(Executor executor, pid_type pid)
+            : pid_(pid), signal_set_(executor, SIGCHLD)
+    {
+    }
+
+    basic_process_handle_signal(basic_process_handle_signal && handle)
+    : pid_(handle.pid_), signal_set_(handle.signal_set_.get_executor(), SIGCHLD)
+    {
+        handle.pid_ = -1;
+    }
+
+    basic_process_handle_signal& operator=(basic_process_handle_signal && handle)
+    {
+        pid_ = handle.id();
+        signal_set_.~basic_signal_set();
+        using ss = BOOST_PROCESS_V2_ASIO_NAMESPACE::basic_signal_set<Executor>;
+        new (&signal_set_) ss(handle.get_executor(), SIGCHLD);
+        handle.pid_ = -1;
+        return *this;
+    }
+
+
+    template<typename Executor1>
+    basic_process_handle_signal(basic_process_handle_signal<Executor1> && handle)
+    : pid_(handle.pid_), signal_set_(Executor1(handle.signal_set_.get_executor()), SIGCHLD)
+    {
+        handle.pid_ = -1;
+    }
+
+    pid_type id() const { return pid_; }
+    native_handle_type native_handle() {return {};}
+
+    void terminate_if_running(error_code &)
+    {
+         terminate_if_running();
+    }
+
+    void terminate_if_running()
+    {
+        if (pid_ <= 0)
+            return;
+        if (::waitpid(pid_, nullptr, WNOHANG) == 0)
+        {
+            ::kill(pid_, SIGKILL);
+            ::waitpid(pid_, nullptr, 0);
+        }
+    }
+
+    void wait(native_exit_code_type &exit_status, error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        while (::waitpid(pid_, &exit_status, 0) < 0)
+        {
+            if (errno != EINTR)
+            {
+                ec = get_last_error();
+                break;
+            }      
+        }
+    }
+
+    void wait(native_exit_code_type &exit_status)
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        wait(exit_status, ec);
+        if (ec)
+            detail::throw_error(ec, "wait(pid)");
+    }
+
+    void interrupt(error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        if (::kill(pid_, SIGTERM) == -1)
+            ec = get_last_error();
+    }
+
+    void interrupt()
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        interrupt(ec);
+        if (ec)
+            detail::throw_error(ec, "interrupt");
+    }
+
+    void request_exit(error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        if (::kill(pid_, SIGTERM) == -1)
+            ec = get_last_error();
+    }
+
+    void request_exit()
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        request_exit(ec);
+        if (ec)
+            detail::throw_error(ec, "request_exit");
+    }
+
+    void suspend()
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        suspend(ec);
+        if (ec)
+            detail::throw_error(ec, "suspend");
+    }
+
+    void suspend(error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        if (::kill(pid_, SIGCONT) == -1)
+            ec = get_last_error();
+    }
+
+    void resume()
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        resume(ec);
+        if (ec)
+            detail::throw_error(ec, "resume");
+    }
+
+    void resume(error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        if (::kill(pid_, SIGTERM) == -1)
+            ec = get_last_error();
+    }
+
+    void terminate(native_exit_code_type &exit_status, error_code &ec)
+    {
+        if (pid_ <= 0)
+            return;
+        if (::kill(pid_, SIGKILL) == -1)
+            ec = get_last_error();
+    }
+
+    void terminate(native_exit_code_type &exit_status)
+    {
+        if (pid_ <= 0)
+            return;
+        error_code ec;
+        terminate(exit_status, ec);
+        if (ec)
+            detail::throw_error(ec, "terminate");
+    }
+
+    bool running(native_exit_code_type &exit_code, error_code & ec)
+    {
+        if (pid_ <= 0)
+            return false;
+        int code = 0;
+        int res = ::waitpid(pid_, &code, WNOHANG);
+        if (res == -1)
+            ec = get_last_error();
+        
+        if (res == 0)
+            return true;
+        else
+        {
+            exit_code = code;
+            return false;
+        }
+    }
+
+    bool running(native_exit_code_type &exit_code)
+    {
+        if (pid_ <= 0)
+            return false;
+
+        error_code ec;
+        bool res = running(exit_code, ec);
+        if (ec)
+            detail::throw_error(ec, "is_running");
+        return res;
+    }
+
+    bool is_open() const
+    {
+        return pid_ != -1;
+    }
+
+    template<BOOST_PROCESS_V2_COMPLETION_TOKEN_FOR(void(error_code, int))
+    WaitHandler BOOST_PROCESS_V2_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+    BOOST_PROCESS_V2_INITFN_AUTO_RESULT_TYPE(WaitHandler, void (error_code, native_exit_code_type))
+    async_wait(WaitHandler &&handler BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+    {
+        return BOOST_PROCESS_V2_ASIO_NAMESPACE::async_compose<WaitHandler, void(error_code, native_exit_code_type)>(
+                async_wait_op_{signal_set_, pid_}, handler, signal_set_);
+    }
+
+  private:
+    template<typename>
+    friend struct basic_process_handle_signal;
+    pid_type pid_ = -1;
+    BOOST_PROCESS_V2_ASIO_NAMESPACE::basic_signal_set<Executor> signal_set_;
+
+    struct async_wait_op_
+    {
+        BOOST_PROCESS_V2_ASIO_NAMESPACE::basic_signal_set<Executor> &handle;
+        pid_type pid_;
+        
+        template<typename Self>
+        void operator()(Self &&self)
+        {
+            handle.async_wait(std::move(self));
+            handle.cancel();
+            // we cancel so we end up on the signal-sets executor 
+        }
+
+        template<typename Self>
+        void operator()(Self &&self, error_code ec, int sig)
+        {
+            if (ec == BOOST_PROCESS_V2_ASIO_NAMESPACE::error::operation_aborted && 
+                self.get_cancellation_state().cancelled() 
+                    == BOOST_PROCESS_V2_ASIO_NAMESPACE::cancellation_type::none)
+                ec.clear();
+
+            native_exit_code_type exit_code = -1;
+            int wait_res = -1;
+
+            if (pid_ <= 0) // error, complete early
+                ec = BOOST_PROCESS_V2_ASIO_NAMESPACE::error::bad_descriptor;
+            else if (!ec)
+            {
+                wait_res = ::waitpid(pid_, &exit_code, WNOHANG);
+                if (wait_res == -1)
+                    ec = get_last_error();
+            }
+
+            if (!ec && (wait_res == 0))
+            {
+                handle.async_wait(std::move(self));
+                return;
+            }
+
+            struct completer
+            {
+                error_code ec;
+                native_exit_code_type code;
+                typename std::decay<Self>::type self;
+
+                void operator()()
+                {
+                    self.complete(ec, code);
+                }
+            };
+
+            const auto exec = self.get_executor();
+            BOOST_PROCESS_V2_ASIO_NAMESPACE::dispatch(exec, completer{ec, exit_code, std::move(self)});
+        }
+    };
+};
+
+}
+
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+
+#endif //BOOST_PROCESS_V2_DETAIL_PROCESS_HANDLE_SIGNAL_HPP

include/boost/process/v2/detail/process_handle_windows.hpp

@@ -0,0 +1,305 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_PROCESS_HANDLE_WINDOWS_HPP
+#define BOOST_PROCESS_V2_DETAIL_PROCESS_HANDLE_WINDOWS_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+
+#include <boost/process/v2/exit_code.hpp>
+#include <boost/process/v2/pid.hpp>
+#include <boost/process/v2/detail/throw_error.hpp>
+
+#if defined(BOOST_PROCESS_V2_STANDALONE)
+#include <asio/any_io_executor.hpp>
+#include <asio/compose.hpp>
+#include <asio/windows/basic_object_handle.hpp>
+#else
+#include <boost/asio/any_io_executor.hpp>
+#include <boost/asio/compose.hpp>
+#include <boost/asio/windows/basic_object_handle.hpp>
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace detail
+{
+  
+BOOST_PROCESS_V2_DECL void get_exit_code_( void * handle, native_exit_code_type & exit_code, error_code & ec);
+BOOST_PROCESS_V2_DECL void * open_process_(pid_type pid);
+BOOST_PROCESS_V2_DECL void terminate_if_running_(void * handle);
+BOOST_PROCESS_V2_DECL bool check_handle_(void* handle, error_code & ec);
+BOOST_PROCESS_V2_DECL bool check_pid_(pid_type pid_, error_code & ec);
+BOOST_PROCESS_V2_DECL void interrupt_(pid_type pid_, error_code & ec);
+BOOST_PROCESS_V2_DECL void suspend_(void * handle, error_code & ec);
+BOOST_PROCESS_V2_DECL void resume_(void * handle, error_code & ec);
+BOOST_PROCESS_V2_DECL void terminate_(void * handle, error_code & ec, native_exit_code_type & exit_code);
+BOOST_PROCESS_V2_DECL void request_exit_(pid_type pid_, error_code & ec);
+BOOST_PROCESS_V2_DECL void check_running_(void* handle, error_code & ec, native_exit_code_type & exit_status);
+
+template<typename Executor = BOOST_PROCESS_V2_ASIO_NAMESPACE::any_io_executor>
+struct basic_process_handle_win
+{
+    typedef BOOST_PROCESS_V2_ASIO_NAMESPACE::windows::basic_object_handle<Executor> handle_type;
+    typedef typename handle_type::native_handle_type native_handle_type;
+
+    typedef Executor executor_type;
+
+    executor_type get_executor()
+    { return handle_.get_executor(); }
+
+    /// Rebinds the process_handle to another executor.
+    template<typename Executor1>
+    struct rebind_executor
+    {
+        /// The socket type when rebound to the specified executor.
+        typedef basic_process_handle_win<Executor1> other;
+    };
+
+    template<typename ExecutionContext>
+    basic_process_handle_win(ExecutionContext &context,
+                         typename std::enable_if<
+                                 std::is_convertible<ExecutionContext &,
+                                         BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context &>::value
+                         >::type = 0)
+            : pid_(0), handle_(context)
+    {
+    }
+
+    basic_process_handle_win(Executor executor)
+            : pid_(0), handle_(executor)
+    {
+    }
+
+    basic_process_handle_win(Executor executor, pid_type pid)
+            : pid_(pid), handle_(executor, detail::open_process_(pid))
+    {
+    }
+
+    basic_process_handle_win(Executor executor, pid_type pid, native_handle_type process_handle)
+            : pid_(pid), handle_(executor, process_handle)
+    {
+    }
+
+
+    template<typename Executor1>
+    basic_process_handle_win(basic_process_handle_win<Executor1> && handle)
+            : pid_(handle.pid_), handle_(std::move(handle.handle_))
+    {
+    }
+
+    basic_process_handle_win(basic_process_handle_win && handle) 
+        :  pid_(handle.id()), handle_(std::move(handle.handle_))
+    {
+        handle.pid_ = static_cast<DWORD>(-1);
+    }
+
+    basic_process_handle_win& operator=(basic_process_handle_win && handle)
+    {
+        pid_ = handle.pid_;
+        handle_ = std::move(handle.handle_);
+        handle.pid_ = static_cast<DWORD>(-1);
+        return *this;
+    }
+
+    ~basic_process_handle_win()
+    {
+        if (handle_.is_open())
+        {
+            error_code ec;
+            handle_.close(ec);
+        }
+    }
+
+    native_handle_type native_handle()
+    { return handle_.native_handle(); }
+
+    pid_type id() const
+    { return pid_; }
+
+    void terminate_if_running(error_code &)
+    {
+        detail::terminate_if_running_(handle_.native_handle());
+    }
+
+    void terminate_if_running()
+    {
+        detail::terminate_if_running_(handle_.native_handle());
+    }
+
+    void wait(native_exit_code_type &exit_status, error_code &ec)
+    {
+        if (!detail::check_handle_(handle_.native_handle(), ec))
+            return;
+
+        handle_.wait(ec);
+        if (!ec)
+            detail::get_exit_code_(handle_.native_handle(), exit_status, ec);
+    }
+
+
+    void wait(native_exit_code_type &exit_status)
+    {
+        error_code ec;
+        wait(exit_status, ec);
+        if (ec)
+            detail::throw_error(ec, "wait(pid)");
+    }
+
+    void interrupt(error_code &ec)
+    {
+        if (!detail::check_pid_(pid_, ec))
+            return;
+
+        detail::interrupt_(pid_, ec);
+    }
+
+    void interrupt()
+    {
+        error_code ec;
+        interrupt(ec);
+        if (ec)
+            detail::throw_error(ec, "interrupt");
+    }
+
+    void request_exit(error_code &ec)
+    {
+        if (!detail::check_pid_(pid_, ec))
+            return;
+        detail::request_exit_(pid_, ec);
+    }
+
+    void request_exit()
+    {
+        error_code ec;
+        request_exit(ec);
+        if (ec)
+            detail::throw_error(ec, "request_exit");
+    }
+
+    void suspend(error_code &ec)
+    {
+        detail::suspend_(handle_.native_handle(), ec);
+    }
+
+    void suspend()
+    {
+        error_code ec;
+        suspend(ec);
+        if (ec)
+            detail::throw_error(ec, "suspend");
+    }
+
+    void resume(error_code &ec)
+    {
+        detail::resume_(handle_.native_handle(), ec);
+    }
+
+    void resume()
+    {
+        error_code ec;
+        suspend(ec);
+        if (ec)
+            detail::throw_error(ec, "resume");
+    }
+
+    void terminate(native_exit_code_type &exit_status, error_code &ec)
+    {
+        if (!detail::check_handle_(handle_.native_handle(), ec))
+            return;
+
+        detail::terminate_(handle_.native_handle(), ec, exit_status);
+        if (!ec)
+            wait(exit_status, ec);
+
+    }
+
+    void terminate(native_exit_code_type &exit_status)
+    {
+        error_code ec;
+        terminate(exit_status, ec);
+        if (ec)
+            detail::throw_error(ec, "terminate");
+    }
+
+    bool running(native_exit_code_type &exit_code, error_code & ec)
+    {
+        if (!detail::check_handle_(handle_.native_handle(), ec))
+            return false;
+
+        native_exit_code_type code;
+        //single value, not needed in the winapi.
+        detail::check_running_(handle_.native_handle(), ec, code);
+        if (ec)
+            return false;
+
+        if (process_is_running(code))
+            return true;
+        else
+        {
+            exit_code = code;
+            return false;
+        }
+    }
+
+    bool running(native_exit_code_type &exit_code)
+    {
+        error_code ec;
+        bool res = running(exit_code, ec);
+        if (ec)
+            detail::throw_error(ec, "is_running");
+        return res;
+    }
+
+    bool is_open() const
+    {
+        return handle_.is_open();
+    }
+
+    template<BOOST_PROCESS_V2_COMPLETION_TOKEN_FOR(void(error_code, native_exit_code_type))
+    WaitHandler BOOST_PROCESS_V2_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
+    BOOST_PROCESS_V2_INITFN_AUTO_RESULT_TYPE(WaitHandler, void (error_code, native_exit_code_type))
+    async_wait(WaitHandler &&handler BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
+    {
+        return BOOST_PROCESS_V2_ASIO_NAMESPACE::async_compose<WaitHandler, void(error_code, native_exit_code_type)>(
+                async_wait_op_{handle_}, handler, handle_
+        );
+    }
+    template<typename>
+    friend struct basic_process_handle_win;
+  private:
+    pid_type pid_;
+    handle_type handle_;
+
+    struct async_wait_op_
+    {
+        handle_type &handle;
+
+        template<typename Self>
+        void operator()(Self &&self)
+        {
+            handle.async_wait(std::move(self));
+        }
+
+        template<typename Self>
+        void operator()(Self &&self, error_code ec)
+        {
+            native_exit_code_type exit_code{};
+            if (!ec)
+                detail::get_exit_code_(handle.native_handle(), exit_code, ec);
+            std::move(self).complete(ec, exit_code);
+        }
+    };
+};
+
+#if !defined(BOOST_PROCESS_V2_HEADER_ONLY)
+extern template struct basic_process_handle_win<>;
+#endif
+
+}
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+
+#endif //BOOST_PROCESS_V2_DETAIL_PROCESS_HANDLE_WINDOWS_HPP

include/boost/process/v2/detail/throw_error.hpp

@@ -0,0 +1,38 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_THROW_ERROR_HPP
+#define BOOST_PROCESS_V2_DETAIL_THROW_ERROR_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+namespace detail
+{
+
+BOOST_PROCESS_V2_DECL void do_throw_error(const error_code& err);
+BOOST_PROCESS_V2_DECL void do_throw_error(const error_code& err, const char* location);
+
+inline void throw_error(const error_code& err)
+{
+    if (err)
+        do_throw_error(err);
+}
+
+inline void throw_error(const error_code& err, const char* location)
+{
+    if (err)
+        do_throw_error(err, location);
+}
+
+}
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#if defined(BOOST_PROCESS_V2_HEADER_ONLY)
+
+#include <boost/process/v2/detail/impl/throw_error.ipp>
+
+#endif
+
+#endif //BOOST_PROCESS_V2_DETAIL_THROW_ERROR_HPP

include/boost/process/v2/detail/throw_exception.hpp

@@ -0,0 +1,39 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_THROW_EXCEPTION_HPP
+#define BOOST_PROCESS_V2_DETAIL_THROW_EXCEPTION_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+
+#if !defined(BOOST_PROCESS_V2_STANDALONE)
+
+#include <boost/throw_exception.hpp>
+
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace detail
+{
+
+#if defined(BOOST_PROCESS_V2_STANDALONE)
+
+template <typename Exception>
+inline void throw_exception(const Exception& e)
+{
+    throw e;
+}
+
+#else
+
+using boost::throw_exception;
+
+#endif
+
+}
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //BOOST_PROCESS_V2_DETAIL_THROW_EXCEPTION_HPP

include/boost/process/v2/detail/utf8.hpp

@@ -0,0 +1,95 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_DETAIL_UTF8_HPP
+#define BOOST_PROCESS_V2_DETAIL_UTF8_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/detail/throw_error.hpp>
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace detail
+{
+
+BOOST_PROCESS_V2_DECL std::size_t size_as_utf8(const wchar_t * in, std::size_t size, error_code & ec);
+BOOST_PROCESS_V2_DECL std::size_t size_as_wide(const  char   * in, std::size_t size, error_code & ec);
+
+BOOST_PROCESS_V2_DECL std::size_t convert_to_utf8(const wchar_t * in, std::size_t size, 
+                                                   char   * out, std::size_t max_size, error_code & ec);
+BOOST_PROCESS_V2_DECL std::size_t convert_to_wide(const  char   * in, std::size_t size,  
+                                                  wchar_t * out, std::size_t max_size, error_code & ec);
+
+template<typename CharOut, typename Traits = std::char_traits<CharOut>, 
+         typename Allocator = std::allocator<CharOut>, typename CharIn,
+         typename = typename std::enable_if<std::is_same<CharOut, CharIn>::value>::type>
+BOOST_PROCESS_V2_DECL 
+std::basic_string<CharOut, Traits, Allocator> conv_string(
+    const CharIn * data, std::size_t size, 
+    const Allocator allocator = Allocator{})
+{
+    return std::basic_string<CharOut, Traits, Allocator>(data, size, allocator);
+}
+
+
+template<typename CharOut, typename Traits = std::char_traits<CharOut>, 
+         typename Allocator = std::allocator<CharOut>,
+         typename = typename std::enable_if<std::is_same<CharOut, char>::value>::type>
+BOOST_PROCESS_V2_DECL 
+std::basic_string<CharOut, Traits, Allocator> conv_string(
+    const wchar_t * data, std::size_t size, 
+    const Allocator allocator = Allocator{})
+{
+    error_code ec;
+    const auto req_size = size_as_utf8(data, size, ec);
+    if (ec)
+        detail::throw_error(ec, "size_as_utf8");
+
+    std::basic_string<CharOut, Traits, Allocator> res(allocator);
+    res.resize(req_size);
+
+    auto res_size = convert_to_utf8(data, size, &res.front(), req_size,  ec);
+    if (ec)
+        detail::throw_error(ec, "convert_to_utf8");
+
+    res.resize(res_size);
+    return res;
+}
+
+template<typename CharOut, typename Traits = std::char_traits<CharOut>, 
+         typename Allocator = std::allocator<CharOut>,
+         typename = typename std::enable_if<std::is_same<CharOut, wchar_t>::value>::type>
+BOOST_PROCESS_V2_DECL 
+std::basic_string<CharOut, Traits, Allocator> conv_string(
+    const char * data, std::size_t size, 
+    const Allocator allocator = Allocator{})
+{
+    error_code ec;
+    const auto req_size = size_as_wide(data, size, ec);
+    if (ec)
+        detail::throw_error(ec, "size_as_wide");
+
+    std::basic_string<CharOut, Traits, Allocator> res(allocator);
+    res.resize(req_size);
+
+    auto res_size = convert_to_wide(data, size, &res.front(), req_size,  ec);
+    if (ec)
+        detail::throw_error(ec, "convert_to_wide");
+
+    res.resize(res_size);
+    return res;
+}
+
+}
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#if defined(BOOST_PROCESS_V2_HEADER_ONLY)
+
+#include <boost/process/v2/detail/impl/utf8.ipp>
+
+#endif
+
+
+#endif //BOOST_PROCESS_V2_DETAIL_UTF8_HPP

include/boost/process/v2/error.hpp

@@ -0,0 +1,50 @@
+// Copyright (c) 2021 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_ERROR_HPP
+#define BOOST_PROCESS_V2_ERROR_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace error
+{
+
+/// Errors used for utf8 <-> UCS-2 conversions.
+enum utf8_conv_error
+{
+    insufficient_buffer = 1,
+    invalid_character,
+};
+
+extern BOOST_PROCESS_V2_DECL const error_category& get_utf8_category();
+static const error_category& utf8_category = get_utf8_category();
+
+extern BOOST_PROCESS_V2_DECL const error_category& get_exit_code_category();
+
+/// An error category that can be used to interpret exit codes of subprocesses.
+/** Currently not used by boost.process, but it might be in the future.
+ * 
+ * void run_my_process(filesystem::path pt, error_code & ec)
+ * {
+ *     process proc(pt, {});
+ *     proc.wait();
+ *     ec.assign(proc.native_exit_code(), error::get_exit_code_category());
+ * }
+ * 
+ * */
+static const error_category& exit_code_category = get_exit_code_category();
+
+}
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#if defined(BOOST_PROCESS_V2_HEADER_ONLY)
+
+#include <boost/process/v2/impl/error.ipp>
+
+#endif
+
+#endif //BOOST_PROCESS_V2_ERROR_HPP

include/boost/process/v2/execute.hpp

@@ -0,0 +1,120 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_EXECUTE_HPP
+#define BOOST_PROCESS_V2_EXECUTE_HPP
+
+#include <boost/process/v2/process.hpp>
+
+#if defined(BOOST_PROCESS_V2_STANDALONE)
+#include <asio/bind_cancellation_slot.hpp>
+#else
+#include <boost/asio/bind_cancellation_slot.hpp>
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+
+/**
+ * @brief Run a process and wait for it to complete.
+ * 
+ * @tparam Executor The asio executor of the process handle
+ * @param proc The process to be run.
+ * @return int The exit code of the process
+ * @exception system_error An error that might have occurred during the wait.
+ */
+template<typename Executor>
+inline int execute(basic_process<Executor> proc)
+{
+    return proc.wait();
+}
+
+/** \overload int execute(const basic_process<Executor> proc) */
+template<typename Executor>
+inline int execute(basic_process<Executor> proc, error_code & ec)
+{
+    return proc.wait(ec);
+}
+
+namespace detail
+{
+
+template<typename Executor>
+struct execute_op
+{
+    std::unique_ptr<basic_process<Executor>> proc;
+
+    struct cancel
+    {
+        using cancellation_type = BOOST_PROCESS_V2_ASIO_NAMESPACE::cancellation_type;
+        basic_process<Executor> * proc;
+        cancel(basic_process<Executor> * proc) : proc(proc) {}
+
+        void operator()(cancellation_type tp)
+        {
+            error_code ign;
+            if ((tp & cancellation_type::total) != cancellation_type::none)
+                proc->interrupt(ign);
+            else if ((tp & cancellation_type::partial) != cancellation_type::none)
+                proc->request_exit(ign);
+            else if ((tp & cancellation_type::terminal) != cancellation_type::none)
+                proc->terminate(ign);
+        }
+    };
+
+    template<typename Self>
+    void operator()(Self && self)
+    {
+        self.reset_cancellation_state(BOOST_PROCESS_V2_ASIO_NAMESPACE::enable_total_cancellation());
+        BOOST_PROCESS_V2_ASIO_NAMESPACE::cancellation_slot s = self.get_cancellation_state().slot();
+        if (s.is_connected())
+            s.emplace<cancel>(proc.get());
+
+        auto pro_ = proc.get();
+        pro_->async_wait(
+                BOOST_PROCESS_V2_ASIO_NAMESPACE::bind_cancellation_slot(
+                    BOOST_PROCESS_V2_ASIO_NAMESPACE::cancellation_slot(),
+                    std::move(self)));
+    }
+
+    template<typename Self>
+    void operator()(Self && self, error_code ec, int res)
+    { 
+        self.get_cancellation_state().slot().clear();
+        self.complete(ec, res);
+    }
+};
+
+}
+
+/// Execute a process asynchronously
+/** This function asynchronously for a process to complete.
+ * 
+ * Cancelling the execution will signal the child process to exit
+ * with the following interpretations:
+ * 
+ *  - cancellation_type::total    -> interrupt
+ *  - cancellation_type::partial  -> request_exit
+ *  - cancellation_type::terminal -> terminate
+ * 
+ * It is to note that `async_execute` will us the lowest selected cancellation
+ * type. A subprocess might ignore anything not terminal.
+ */
+template<typename Executor = BOOST_PROCESS_V2_ASIO_NAMESPACE::any_io_executor,
+        BOOST_PROCESS_V2_COMPLETION_TOKEN_FOR(void (error_code, int))
+            WaitHandler BOOST_PROCESS_V2_DEFAULT_COMPLETION_TOKEN_TYPE(Executor)>
+inline
+BOOST_PROCESS_V2_INITFN_AUTO_RESULT_TYPE(WaitHandler, void (error_code, int))
+async_execute(basic_process<Executor> proc,
+                         WaitHandler && handler BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(Executor))
+{
+    std::unique_ptr<basic_process<Executor>> pro_(new basic_process<Executor>(std::move(proc)));
+    auto exec = proc.get_executor();
+    return BOOST_PROCESS_V2_ASIO_NAMESPACE::async_compose<WaitHandler, void(error_code, int)>(
+            detail::execute_op<Executor>{std::move(pro_)}, handler, exec);
+}
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //BOOST_PROCESS_V2_EXECUTE_HPP

include/boost/process/v2/exit_code.hpp

@@ -0,0 +1,132 @@
+//
+// process/exit_code.hpp
+// ~~~~~~~~~~~~~~
+//
+// Copyright (c) 2022 Klemens D. Morgenstern (klemens dot morgenstern at gmx dot net)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_PROCESS_V2_EXIT_CODE_HPP
+#define BOOST_PROCESS_V2_EXIT_CODE_HPP
+
+#include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/error.hpp>
+
+#if defined(BOOST_PROCESS_V2_STANDALONE)
+#include <asio/associator.hpp>
+#include <asio/async_result.hpp>
+#else
+#include <boost/asio/associator.hpp>
+#include <boost/asio/async_result.hpp>
+#endif 
+
+#if defined(BOOST_PROCESS_V2_POSIX)
+#include <sys/wait.h>
+#endif
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+#if defined(GENERATING_DOCUMENTATION)
+
+/// The native exit-code type, usually an integral value
+/** The OS may have a value different from `int` to represent 
+ * the exit codes of subprocesses. It might also 
+ * contain additional information.
+ */ 
+typedef implementation_defined native_exit_code_type;
+
+
+/// Check if the native exit code indicates the process is still running
+bool process_is_running(native_exit_code_type code);
+
+/// Obtain the portable part of the exit code, i.e. what the subprocess has returned from main.
+int evaluate_exit_code(native_exit_code_type code);
+
+
+#else
+
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+
+typedef unsigned long native_exit_code_type;
+
+namespace detail
+{
+constexpr native_exit_code_type still_active = 259u;
+}
+
+inline bool process_is_running(native_exit_code_type code)
+{
+  return code == detail::still_active;
+}
+
+inline int evaluate_exit_code(native_exit_code_type code)
+{
+  return static_cast<int>(code);
+}
+
+#else
+
+typedef int native_exit_code_type;
+
+namespace detail
+{
+constexpr native_exit_code_type still_active = 0x7f;
+}
+
+inline bool process_is_running(int code)
+{
+    return !WIFEXITED(code) && !WIFSIGNALED(code);
+}
+
+inline int evaluate_exit_code(int code)
+{
+  if (WIFEXITED(code))
+    return WEXITSTATUS(code);
+  else if (WIFSIGNALED(code))
+    return WTERMSIG(code);
+  else
+    return code;
+}
+
+#endif
+
+#endif
+
+/// @{
+/** Helper to subsume an exit-code into an error_code if there's no actual error isn't set.
+ * @code {.cpp}
+ * process proc{ctx, "exit", {"1"}};
+ * 
+ * proc.async_wait(
+ *     asio::deferred(
+ *      [&proc](error_code ec, int)
+ *      {
+ *        return asio::deferred.values(
+ *                  check_exit_code(ec, proc.native_exit_code())
+ *              );
+ *
+ *    [](error_code ec)
+ *    {
+ *      assert(ec.value() == 10);
+ *      assert(ec.category() == error::get_exit_code_category());
+ *    }));
+ * 
+ * @endcode
+ */
+
+inline error_code check_exit_code(
+    error_code &ec, native_exit_code_type native_code,
+    const error_category & category = error::get_exit_code_category())
+{
+  if (!ec)
+    BOOST_PROCESS_V2_ASSIGN_EC(ec, native_code, category);
+  return ec;
+}
+
+/// @}
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#endif //BOOST_PROCESS_V2_EXIT_CODE_HPP

include/boost/process/v2/ext.hpp

@@ -0,0 +1,16 @@
+//
+// Copyright (c) 2023 Klemens Morgenstern (klemens.morgenstern@gmx.net)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_PROCESS_V2_EXT_HPP
+#define BOOST_PROCESS_V2_EXT_HPP
+
+#include <boost/process/v2/ext/cmd.hpp>
+#include <boost/process/v2/ext/cwd.hpp>
+#include <boost/process/v2/ext/env.hpp>
+#include <boost/process/v2/ext/exe.hpp>
+
+#endif //BOOST_PROCESS_V2_EXT_HPP

include/boost/process/v2/ext/cmd.hpp

@@ -0,0 +1,71 @@
+// Copyright (c) 2022 Klemens D. Morgenstern
+// Copyright (c) 2022 Samuel Venable
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#ifndef BOOST_PROCESS_V2_CMD_HPP
+#define BOOST_PROCESS_V2_CMD_HPP
+
+#include <string>
+#include <vector>
+
+#include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/detail/throw_error.hpp>
+#include <boost/process/v2/process_handle.hpp>
+#include <boost/process/v2/pid.hpp>
+
+#include <boost/process/v2/shell.hpp>
+
+BOOST_PROCESS_V2_BEGIN_NAMESPACE
+
+namespace ext {
+
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+BOOST_PROCESS_V2_DECL shell cmd(HANDLE handle, error_code & ec);
+BOOST_PROCESS_V2_DECL shell cmd(HANDLE handle);
+#endif
+
+/// @{
+/// Get the argument vector of another process
+BOOST_PROCESS_V2_DECL shell cmd(pid_type pid, error_code & ec);
+BOOST_PROCESS_V2_DECL shell cmd(pid_type pid);
+
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+BOOST_PROCESS_V2_DECL shell cmd(HANDLE handle, error_code & ec);
+BOOST_PROCESS_V2_DECL shell cmd(HANDLE handle);
+#endif
+
+template<typename Executor>
+BOOST_PROCESS_V2_DECL shell cmd(basic_process_handle<Executor> & handle, error_code & ec)
+{
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+    return cmd(handle.native_handle(), ec);
+#else
+    return cmd(handle.id(), ec);
+#endif
+}
+
+template<typename Executor>
+BOOST_PROCESS_V2_DECL shell cmd(basic_process_handle<Executor> & handle)
+{
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+    return cmd(handle.native_handle());
+#else
+    return cmd(handle.id());
+#endif
+}
+
+/// @}
+
+} // namespace ext
+
+BOOST_PROCESS_V2_END_NAMESPACE
+
+#if defined(BOOST_PROCESS_V2_HEADER_ONLY)
+
+#include <boost/process/v2/ext/impl/cmd.ipp>
+
+#endif
+
+
+#endif // BOOST_PROCESS_V2_CMD_HPP