ec fix for search_path with std::filesystem.

closes #287.

.drone.star

@@ -14,7 +14,8 @@ windowsglobalimage="cppalliance/dronevs2019"
 
 def main(ctx):
   return [
-    #freebsd_cxx("FreeBSD", "g++10",  packages="g++10",  buildtype="boost", buildscript="drone",                                                environment={ "VARIANT": "release", "TOOLSET": "gcc", "COMPILER": "g++", "CXXSTD": "11" }, globalenv=globalenv),
+  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 mlocate", 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),

doc/v2/quickstart.qbk

@@ -1,4 +1,4 @@
-[section:quickstart Quickstrat]
+[section:quickstart Quickstart]
 
 A process needs four things to be launched:
 

include/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/posix/basic_cmd.hpp

@@ -139,7 +139,7 @@ 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(

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

@@ -155,8 +155,8 @@ class executor
     void write_error(const std::error_code & ec, const char * msg)
     {
         //I am the child
-        const auto len = std::strlen(msg);
-        int data[2] = {ec.value(), static_cast<int>(len + 1)};
+        const auto len = static_cast<int>(std::strlen(msg));
+        int data[2] = {ec.value(), len + 1};
 
         boost::ignore_unused(::write(_pipe_sink, &data[0], sizeof(int) * 2));
         boost::ignore_unused(::write(_pipe_sink, msg, len));

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

@@ -27,7 +27,11 @@ inline boost::process::filesystem::path search_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;
+#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/windows/search_path.hpp

@@ -61,7 +61,11 @@ inline boost::process::filesystem::path search_path(
         {
             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;
+#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/environment.hpp

@@ -263,7 +263,7 @@ public:
         auto st1 = key + ::boost::process::detail::equal_sign<Char>();
         while (*p != nullptr)
         {
-            const int len = std::char_traits<Char>::length(*p);
+            const auto len = std::char_traits<Char>::length(*p);
             if ((std::distance(st1.begin(), st1.end()) < len)
                  && std::equal(st1.begin(), st1.end(), *p))
                 break;

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/detail/config.hpp

@@ -7,18 +7,19 @@
 
 #if defined(BOOST_PROCESS_V2_STANDALONE)
 
-#define BOOST_PROCESS_V2_ASIO_NAMESPACE ::asio
+#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
@@ -39,18 +40,19 @@
 
 #else
 
-#define BOOST_PROCESS_V2_ASIO_NAMESPACE ::boost::asio
+#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
@@ -72,11 +74,9 @@
 
 #if defined(BOOST_PROCESS_USE_STD_FS)
 #include <filesystem>
-#include <optional>
 #else
 #include <boost/filesystem/path.hpp>
 #include <boost/filesystem/operations.hpp>
-#include <boost/optional.hpp>
 #endif
 
 #define BOOST_PROCESS_V2_BEGIN_NAMESPACE namespace boost { namespace process { namespace v2 {
@@ -142,7 +142,7 @@ BOOST_PROCESS_V2_END_NAMESPACE
 #endif
 #endif
 
-#if defined(__FreeBSD__) && !defined(BOOST_PROCESS_V2_DISABLE_PDFORK)
+#if defined(__FreeBSD__) && defined(BOOST_PROCESS_V2_ENABLE_PDFORK)
 #define BOOST_PROCESS_V2_PDFORK 1
 #define BOOST_PROCESS_V2_HAS_PROCESS_HANDLE 1
 #endif

include/boost/process/v2/exit_code.hpp

@@ -12,6 +12,15 @@
 #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>
@@ -85,6 +94,157 @@ inline int evaluate_exit_code(int code)
 
 #endif
 
+
+/** Convert the exit-code in a completion into an error if the actual error isn't set.
+ * @code {.cpp}
+ * process proc{ctx, "exit", {"1"}};
+ * 
+ * proc.async_wait(code_as_error(
+ *    [](error_code ec)
+ *    {
+ *      assert(ec.value() == 10);
+ *      assert(ec.category() == error::get_exit_code_category());
+ *    }));
+ * 
+ * @endcode
+ */ 
+template<typename CompletionToken>
+struct code_as_error_t
+{
+    CompletionToken token_;
+    const error_category & category;
+
+    template<typename Token_>
+    code_as_error_t(Token_ && token, const error_category & category)
+        : token_(std::forward<Token_>(token)), category(category)
+    {
+    }
+};
+
+/// Deduction function for code_as_error_t.
+template<typename CompletionToken>
+code_as_error_t<CompletionToken> code_as_error(
+        CompletionToken && token, 
+        const error_category & category = error::get_exit_code_category())
+{
+  return code_as_error_t<typename std::decay<CompletionToken>::type>(
+      std::forward<CompletionToken>(token), category);
+};
+
+namespace detail
+{
+
+template<typename Handler>
+struct code_as_error_handler
+{
+  typedef void result_type;
+
+  template<typename H>
+  code_as_error_handler(H && h, const error_category & category) 
+      : handler_(std::forward<H>(h)), category(category) 
+  {
+  }
+
+  void operator()(error_code ec, native_exit_code_type code)
+  {
+    if (!ec)
+      ec.assign(code, category);
+    std::move(handler_)(ec);
+  }
+
+
+  Handler handler_;
+  const error_category & category;
+};
+
+}
+
+
 BOOST_PROCESS_V2_END_NAMESPACE
 
+
+#if !defined(BOOST_PROCESS_V2_STANDALONE)
+namespace boost
+{
+#endif
+namespace asio
+{
+
+template <typename CompletionToken>
+struct async_result<
+    BOOST_PROCESS_V2_NAMESPACE::code_as_error_t<CompletionToken>,
+      void(BOOST_PROCESS_V2_NAMESPACE::error_code,
+           BOOST_PROCESS_V2_NAMESPACE::native_exit_code_type)>
+{
+  using signature = void(BOOST_PROCESS_V2_NAMESPACE::error_code);
+  using return_type = typename async_result<CompletionToken, void(BOOST_PROCESS_V2_NAMESPACE::error_code)>::return_type;
+  
+
+  template <typename Initiation>
+  struct init_wrapper
+  {
+    init_wrapper(Initiation init)
+      : initiation_(std::move(init))
+    {
+    }
+
+    template <typename Handler, typename... Args>
+    void operator()(
+        Handler && handler,
+        const BOOST_PROCESS_V2_NAMESPACE::error_category & cat,
+        Args && ... args)
+    {
+          std::move(initiation_)(
+            BOOST_PROCESS_V2_NAMESPACE::detail::code_as_error_handler<typename decay<Handler>::type>(
+              std::forward<Handler>(handler), cat),
+              std::forward<Args>(args)...);
+    }
+
+    Initiation initiation_;
+
+  };
+
+  template <typename Initiation, typename RawCompletionToken, typename... Args>
+  static BOOST_PROCESS_V2_INITFN_DEDUCED_RESULT_TYPE(CompletionToken, signature,
+      (async_initiate<CompletionToken, signature>(
+        declval<init_wrapper<typename decay<Initiation>::type> >(),
+        declval<CompletionToken&>(),
+        declval<BOOST_ASIO_MOVE_ARG(Args)>()...)))
+  initiate(
+      Initiation && initiation,
+      RawCompletionToken && token,
+      Args &&... args)
+  {
+    return async_initiate<CompletionToken, signature>(
+        init_wrapper<typename decay<Initiation>::type>(
+          std::forward<Initiation>(initiation)),
+          token.token_,
+          token.category,
+          std::forward<Args>(args)...);
+  }
+};
+
+
+
+
+template<template <typename, typename> class Associator, typename Handler, typename DefaultCandidate>
+struct associator<Associator,
+    BOOST_PROCESS_V2_NAMESPACE::detail::code_as_error_handler<Handler>, DefaultCandidate>
+  : Associator<Handler, DefaultCandidate>
+{
+  static typename Associator<Handler, DefaultCandidate>::type get(
+      const BOOST_PROCESS_V2_NAMESPACE::detail::code_as_error_handler<Handler> & h,
+      const DefaultCandidate& c = DefaultCandidate()) noexcept
+  {
+    return Associator<Handler, DefaultCandidate>::get(h.handler_, c);
+  }
+};
+
+
+}
+#if !defined(BOOST_PROCESS_V2_STANDALONE)
+} // boost
+#endif
+
+
 #endif //BOOST_PROCESS_V2_EXIT_CODE_HPP

include/boost/process/v2/popen.hpp

@@ -74,8 +74,6 @@ struct basic_popen : basic_process<Executor>
     {
     }
 
-
-
     /// Construct a child from a property list and launch it using the default process launcher.
     template<typename ... Inits>
     explicit basic_popen(
@@ -85,30 +83,66 @@ struct basic_popen : basic_process<Executor>
             Inits&&... inits)
             : basic_process<Executor>(executor)
     {
-        *static_cast<basic_process<Executor>*>(this) =
+        this->basic_process<Executor>::operator=(
             default_process_launcher()(
                     this->get_executor(), exe, args,
                     std::forward<Inits>(inits)...,
                     process_stdio{stdin_, stdout_}
-                    );
+                    ));
+    }
 
+    /// Construct a child from a property list and launch it using the default process launcher.
+    template<typename Launcher, typename ... Inits>
+    explicit basic_popen(
+            Launcher && launcher,
+            executor_type executor,
+            const filesystem::path& exe,
+            std::initializer_list<string_view> args,
+            Inits&&... inits)
+            : basic_process<Executor>(executor)
+    {
+        this->basic_process<Executor>::operator=(
+            std::forward<Launcher>(launcher)(
+                    this->get_executor(), exe, args,
+                    std::forward<Inits>(inits)...,
+                    process_stdio{stdin_, stdout_}
+                    ));
     }
 
     /// Construct a child from a property list and launch it using the default process launcher.
     template<typename ... Inits>
     explicit basic_popen(
             executor_type executor,
-    const filesystem::path& exe,
+            const filesystem::path& exe,
             std::initializer_list<wstring_view> args,
             Inits&&... inits)
             : basic_process<Executor>(executor)
     {
-        *static_cast<basic_process<Executor>*>(this) =
+        this->basic_process<Executor>::operator=(
                 default_process_launcher()(
                         this->get_executor(), exe, args,
                         std::forward<Inits>(inits)...,
                         process_stdio{stdin_, stdout_}
-                );
+                ));
+    }
+
+
+    /// Construct a child from a property list and launch it using the default process launcher.
+    template<typename Launcher, typename ... Inits>
+    explicit basic_popen(
+            Launcher && launcher, 
+            executor_type executor,
+            const filesystem::path& exe,
+            std::initializer_list<wstring_view> args,
+            Inits&&... inits)
+            : basic_process<Executor>(executor)
+    {
+        this->basic_process<Executor>::operator=(
+                std::forward<Launcher>(launcher)(
+                        this->get_executor(), exe, args,
+                        std::forward<Inits>(inits)...,
+                        process_stdio{stdin_, stdout_}
+                ));
     }
 
     /// Construct a child from a property list and launch it using the default process launcher.
@@ -119,53 +153,112 @@ struct basic_popen : basic_process<Executor>
             Args&& args, Inits&&... inits)
             : basic_process<Executor>(executor)
     {
-        *static_cast<basic_process<Executor>*>(this) =
+        this->basic_process<Executor>::operator=(
                 default_process_launcher()(
                         std::move(executor), exe, args,
                         std::forward<Inits>(inits)...,
                         process_stdio{stdin_, stdout_}
-                );
+                ));
+    }
+
+    /// Construct a child from a property list and launch it using the default process launcher.
+    template<typename Launcher, typename Args, typename ... Inits>
+    explicit basic_popen(
+            Launcher && launcher, 
+            executor_type executor,
+            const filesystem::path& exe,
+            Args&& args, Inits&&... inits)
+            : basic_process<Executor>(executor)
+    {
+        this->basic_process<Executor>::operator=(
+                std::forward<Launcher>(launcher)(
+                        std::move(executor), exe, args,
+                        std::forward<Inits>(inits)...,
+                        process_stdio{stdin_, stdout_}
+                ));
     }
 
     /// Construct a child from a property list and launch it using the default process launcher.
     template<typename ExecutionContext, typename ... Inits>
     explicit basic_popen(
             ExecutionContext & context,
-    typename std::enable_if<
-            std::is_convertible<ExecutionContext&,
+            typename std::enable_if<
+                std::is_convertible<ExecutionContext&,
                     BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context&>::value,
             const filesystem::path&>::type exe,
             std::initializer_list<string_view> args,
-    Inits&&... inits)
+            Inits&&... inits)
             : basic_process<Executor>(context)
     {
-        *static_cast<basic_process<Executor>*>(this) =
+        this->basic_process<Executor>::operator=(
                 default_process_launcher()(
                         this->get_executor(), exe, args,
                         std::forward<Inits>(inits)...,
                         process_stdio{stdin_, stdout_}
-                );
+                ));
+    }
+
+        /// Construct a child from a property list and launch it using the default process launcher.
+    template<typename Launcher, typename ExecutionContext, typename ... Inits>
+    explicit basic_popen(
+            Launcher && launcher, 
+            ExecutionContext & context,
+            typename std::enable_if<
+                std::is_convertible<ExecutionContext&,
+                    BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context&>::value,
+            const filesystem::path&>::type exe,
+            std::initializer_list<string_view> args,
+            Inits&&... inits)
+            : basic_process<Executor>(context)
+    {
+        this->basic_process<Executor>::operator=(
+                std::forward<Launcher>(launcher)(
+                        this->get_executor(), exe, args,
+                        std::forward<Inits>(inits)...,
+                        process_stdio{stdin_, stdout_}
+                ));
     }
 
     /// Construct a child from a property list and launch it using the default process launcher.
     template<typename ExecutionContext, typename Args, typename ... Inits>
     explicit basic_popen(
             ExecutionContext & context,
-    typename std::enable_if<
-            std::is_convertible<ExecutionContext&,
+            typename std::enable_if<
+                std::is_convertible<ExecutionContext&,
                     BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context&>::value,
             const filesystem::path&>::type exe,
             Args&& args, Inits&&... inits)
             : basic_process<Executor>(context)
     {
-        *static_cast<basic_process<Executor>*>(this) =
+        this->basic_process<Executor>::operator=(
                 default_process_launcher()(
                         this->get_executor(), exe, args,
                         std::forward<Inits>(inits)...,
                         process_stdio{stdin_, stdout_}
-                );
+                ));
     }
 
+        /// Construct a child from a property list and launch it using the default process launcher.
+    template<typename Launcher, typename ExecutionContext, typename Args, typename ... Inits>
+    explicit basic_popen(
+            Launcher && launcher, 
+            ExecutionContext & context,
+            typename std::enable_if<
+                std::is_convertible<ExecutionContext&,
+                    BOOST_PROCESS_V2_ASIO_NAMESPACE::execution_context&>::value,
+            const filesystem::path&>::type exe,
+            Args&& args, Inits&&... inits)
+            : basic_process<Executor>(context)
+    {
+        this->basic_process<Executor>::operator=(
+                std::forward<Launcher>(launcher)(
+                        this->get_executor(), exe, args,
+                        std::forward<Inits>(inits)...,
+                        process_stdio{stdin_, stdout_}
+                ));
+    }
+
+
     /// The type used for stdin on the parent process side.
     using stdin_type = BOOST_PROCESS_V2_ASIO_NAMESPACE::basic_writable_pipe<Executor>;
     /// The type used for stdout on the parent process side.

include/boost/process/v2/posix/bind_fd.hpp

@@ -94,6 +94,7 @@ struct bind_fd
     error_code on_setup(posix::default_launcher & launcher, const filesystem::path &, const char * const *)
     {
         launcher.fd_whitelist.push_back(target);
+        return {};
     }
 
     /// Implementation of the initialization function.

include/boost/process/v2/start_dir.hpp

@@ -11,6 +11,7 @@
 #define BOOST_PROCESS_v2_START_DIR_HPP
 
 #include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/detail/last_error.hpp>
 #include <boost/process/v2/default_launcher.hpp>
 
 BOOST_PROCESS_V2_BEGIN_NAMESPACE

include/boost/process/v2/stdio.hpp

@@ -11,6 +11,7 @@
 #define BOOST_PROCESS_V2_STDIO_HPP
 
 #include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/detail/last_error.hpp>
 #include <boost/process/v2/default_launcher.hpp>
 #include <cstddef>
 #if defined(BOOST_PROCESS_V2_STANDALONE)

meta/libraries.json

@@ -1,6 +1,6 @@
 {
   "key": "process",
-  "name": "process",
+  "name": "Process",
   "authors": [
     "Merino Vidal", "Ilya Sokolov", "Felipe Tanus", 
     "Jeff Flinn", "Thomas Jarosch", "Boris Schaeling", "Klemens D. Morgenstern"

test/Jamfile.jam

@@ -100,8 +100,8 @@ test-suite with-valgrind :
     [ run env.cpp     program_options system filesystem       : [ test-options env ] : sparring_partner ]
     [ run group.cpp     system thread filesystem              : [ test-options group ] : sub_launch ]
     [ run group.cpp          system thread filesystem         : [ test-options group ] : sub_launch : <build>no <target-os>windows:<build>yes <define>BOOST_USE_WINDOWS_H=1 : group-windows-h ]
-    [ run group_wait.cpp     system thread filesystem         : [ test-options group_wait ] : sparring_partner : <target-os>darwin:<build>no ]
-	[ run limit_fd.cpp     program_options system filesystem  : [ test-options limit_fd ] : sparring_partner ]
+    [ run group_wait.cpp     system thread filesystem         : [ test-options group_wait ] : sparring_partner : <target-os>darwin:<build>no <target-os>freebsd:<build>no ]
+	[ run limit_fd.cpp     program_options system filesystem  : [ test-options limit_fd ] : sparring_partner : <target-os>freebsd:<build>no ]
     [ run run_exe.cpp filesystem                              : : sparring_partner ]
     [ run run_exe_path.cpp filesystem                         : [ test-options run_exe_path ] : sparring_partner ]
     [ run search_path.cpp filesystem system                   : [ test-options search_path ] : : <target-os>windows:<source>shell32 ]

test/group_wait.cpp

@@ -16,7 +16,7 @@
 
 #include <boost/asio.hpp>
 #include <boost/algorithm/string/predicate.hpp>
-
+#include <boost/scope_exit.hpp>
 #include <boost/process/error.hpp>
 #include <boost/process/io.hpp>
 #include <boost/process/args.hpp>
@@ -45,6 +45,10 @@ BOOST_AUTO_TEST_CASE(wait_group_test, *boost::unit_test::timeout(5))
             BOOST_REQUIRE(done.load());
         }};
 
+    BOOST_SCOPE_EXIT_ALL(&) {    
+        done.store(true);
+        thr.join();
+    };
 
     using boost::unit_test::framework::master_test_suite;
 
@@ -78,9 +82,6 @@ BOOST_AUTO_TEST_CASE(wait_group_test, *boost::unit_test::timeout(5))
 
     BOOST_CHECK(!c1.running());
     BOOST_CHECK(!c2.running());
-
-    done.store(true);
-    thr.join();
 }
 
 

test/limit_fd.cpp

@@ -40,12 +40,19 @@ BOOST_AUTO_TEST_CASE(leak_test, *boost::unit_test::timeout(5))
 {
     using boost::unit_test::framework::master_test_suite;
 
+    
+
 #if defined(BOOST_WINDOWS_API)
     const auto get_handle       = [](FILE * f)                       {return reinterpret_cast<bt::native_handle_type>(_get_osfhandle(_fileno(f)));};
     const auto socket_to_handle = [](::boost::winapi::UINT_PTR_ sock){return reinterpret_cast<::boost::winapi::HANDLE_>(sock);};
 #else
     const auto get_handle = [](FILE * f) {return fileno(f);};
     const auto socket_to_handle = [](int i){ return i;};
+
+#if !defined(__linux__)
+    return ;
+#endif
+
 #endif
 
     std::error_code ec;

test/v2/CMakeLists.txt

@@ -4,6 +4,9 @@ add_library(boost_process_v2_test_impl test_impl.cpp)
 target_link_libraries(boost_process_v2_test_impl Boost::process Boost::unit_test_framework Boost::process)
 target_compile_definitions(boost_process_v2_test_impl PUBLIC -DBOOST_PROCESS_V2_SEPARATE_COMPILATION=1)
 
+if (WIN32)
+    target_compile_definitions(boost_process_v2_test_impl PUBLIC WIN32_LEAN_AND_MEAN=1)
+endif()
 
 function(boost_process_v2_standalone_test name)
     add_executable(boost_process_v2_${name} ${name}.cpp)

test/v2/process.cpp

@@ -24,6 +24,7 @@
 #include <boost/process/v2/start_dir.hpp>
 #include <boost/process/v2/execute.hpp>
 #include <boost/process/v2/stdio.hpp>
+#include <boost/process/v2/bind_launcher.hpp>
 
 #include <boost/test/unit_test.hpp>
 #include <boost/asio/io_context.hpp>
@@ -159,7 +160,12 @@ BOOST_AUTO_TEST_CASE(request_exit)
 
   auto sh = closable();
   BOOST_CHECK_MESSAGE(!sh.empty(), sh);
-  bpv::process proc(ctx, sh, {}
+
+  asio::readable_pipe rp{ctx};
+  asio::writable_pipe wp{ctx};
+  asio::connect_pipe(rp, wp);
+
+  bpv::process proc(ctx, sh, {}, bpv::process_stdio{wp}
 #if defined(ASIO_WINDOWS)
     , asio::windows::show_window_minimized_not_active
 #endif
@@ -357,16 +363,16 @@ BOOST_AUTO_TEST_CASE(popen)
 
 
     // default CWD
-    bpv::popen proc(ctx, pth, {"echo"});
+    bpv::popen proc(/*bpv::default_process_launcher(), */ctx, pth, {"echo"});
 
-    auto written = asio::write(proc, asio::buffer("FOOBAR"));
+    asio::write(proc, asio::buffer("FOOBAR"));
     proc.get_stdin().close();
 
     std::string res;
     boost::system::error_code ec;
     std::size_t n = asio::read(proc, asio::dynamic_buffer(res), ec);
-    BOOST_CHECK(ec == asio::error::eof || ec == asio::error::broken_pipe);
-    BOOST_REQUIRE_GE(n, 1);
+    BOOST_CHECK_MESSAGE(ec == asio::error::eof || ec == asio::error::broken_pipe, ec.message());
+    BOOST_REQUIRE_GE(n, 1u);
     // remove EOF
     res.pop_back();
     BOOST_CHECK_EQUAL(res, "FOOBAR");
@@ -428,7 +434,10 @@ std::string read_env(const char * name, Inits && ... inits)
   std::string out;
   bpv::error_code ec;
 
-  const auto sz = asio::read(rp, asio::dynamic_buffer(out),  ec);
+   auto sz = asio::read(rp, asio::dynamic_buffer(out),  ec);
+  while (ec == asio::error::interrupted)
+    sz += asio::read(rp, asio::dynamic_buffer(out),  ec);
+
   BOOST_CHECK_MESSAGE((ec == asio::error::broken_pipe) || (ec == asio::error::eof), ec.message());
   out.resize(sz);
   trim_end(out);
@@ -473,5 +482,64 @@ BOOST_AUTO_TEST_CASE(environment)
   BOOST_CHECK_EQUAL(read_env("PATH", bpv::process_environment(bpv::environment::current())), ::getenv("PATH"));
 }
 
+BOOST_AUTO_TEST_CASE(exit_code_as_error)
+{
+  using boost::unit_test::framework::master_test_suite;
+  const auto pth = bpv::filesystem::absolute(master_test_suite().argv[1]);
+
+  asio::io_context ctx;
+
+  bpv::process proc1(ctx, pth, {"exit-code", "0"});
+  bpv::process proc2(ctx, pth, {"exit-code", "2"});
+  bpv::process proc3(ctx, pth, {"sleep", "2000"});
+
+  int called = 0;
+  
+  proc3.terminate();
+
+  proc1.async_wait(bpv::code_as_error([&](bpv::error_code ec){called ++; BOOST_CHECK(!ec);}));
+  proc2.async_wait(bpv::code_as_error([&](bpv::error_code ec){called ++; BOOST_CHECK_MESSAGE(ec, ec.message());}));
+  proc3.async_wait(bpv::code_as_error([&](bpv::error_code ec){called ++; BOOST_CHECK_MESSAGE(ec, ec.message());}));
+
+  ctx.run();
+  BOOST_CHECK_EQUAL(called, 3);
+
+}
+
+BOOST_AUTO_TEST_CASE(bind_launcher)
+{
+  using boost::unit_test::framework::master_test_suite;
+  const auto pth = bpv::filesystem::absolute(master_test_suite().argv[1]);
+
+  asio::io_context ctx;
+
+  asio::readable_pipe rp{ctx};
+  asio::writable_pipe wp{ctx};
+  asio::connect_pipe(rp, wp);
+
+  auto target = bpv::filesystem::canonical(bpv::filesystem::temp_directory_path());
+
+  auto l = bpv::bind_default_launcher(bpv::process_start_dir(target));
+
+  std::vector<std::string> args = {"print-cwd"};
+  // default CWD
+  bpv::process proc = l(ctx, pth, args, bpv::process_stdio{/*.in=*/{}, /*.out=*/wp});
+  wp.close();
+
+  std::string out;
+  bpv::error_code ec;
+
+  auto sz = asio::read(rp, asio::dynamic_buffer(out),  ec);
+  while (ec == asio::error::interrupted)
+    sz += asio::read(rp, asio::dynamic_buffer(out),  ec);
+  BOOST_CHECK(sz != 0);
+  BOOST_CHECK_MESSAGE((ec == asio::error::broken_pipe) || (ec == asio::error::eof), ec.message());
+  BOOST_CHECK_MESSAGE(bpv::filesystem::path(out) == target,
+                      bpv::filesystem::path(out) << " != " << target);
+
+  proc.wait();
+  BOOST_CHECK_MESSAGE(proc.exit_code() == 0, proc.exit_code() << " from " << proc.native_exit_code());
+}
+
 BOOST_AUTO_TEST_SUITE_END();
 

test/v2/shell.cpp

@@ -39,9 +39,9 @@ BOOST_AUTO_TEST_CASE(test_shell_parser)
     BOOST_CHECK(sh.argv()[2] == STR_VIEW("foo bar"));
 
 #if defined(BOOST_PROCESS_V2_POSIX)
-    auto raw_shell = "sh -c false";
+    auto raw_shell = "sh -c true";
 #else
-    auto raw_shell = "cmd /c exit 1";
+    auto raw_shell = "cmd /c exit 0";
 #endif
     sh = shell(raw_shell);
 
@@ -52,5 +52,5 @@ BOOST_AUTO_TEST_CASE(test_shell_parser)
     bpv::process proc{ctx, exe, sh.args()};
 
     proc.wait();
-    BOOST_CHECK_EQUAL(proc.exit_code(), 1);
+    BOOST_CHECK_EQUAL(proc.exit_code(), 0);
 }

test/wait_for.cpp

@@ -40,7 +40,7 @@ BOOST_AUTO_TEST_CASE(wait_for)
 
 
     BOOST_CHECK(!c.wait_for(std::chrono::milliseconds(200)));
-    BOOST_CHECK( c.wait_for(std::chrono::milliseconds(1000)));
+    BOOST_CHECK( c.wait_for(std::chrono::milliseconds(2000)));
 
     auto timeout_t = std::chrono::system_clock::now();