Fixed __FreeBSD__ code.

Credit to Samuel Venable, @time-killer-games.

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

@@ -12,6 +12,16 @@
 
 #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
@@ -113,6 +123,33 @@ void check_running_(HANDLE handle, error_code & ec, DWORD & exit_status)
         ec = detail::get_last_error();
 }
 
+#if !defined(BOOST_PROCESS_V2_DISABLE_UNDOCUMENTED_API)
+void suspend_(HANDLE handle, error_code & ec)
+{
+  auto nt_err = NtSuspendProcess(handle);
+  if (nt_err > 0xC0000000)
+    ec = detail::get_last_error();
+}
+
+void resume_(HANDLE handle, error_code & ec)
+{
+
+  auto nt_err = NtResumeProcess(handle);
+  if (nt_err > 0xC0000000)
+    ec = detail::get_last_error();
+}
+#else
+void suspend_(HANDLE, error_code & ec)
+{
+  ec.assign(ERROR_CALL_NOT_IMPLEMENTED, system_category());
+}
+
+void resume_(HANDLE handle, error_code & ec)
+{
+
+    ec.assign(ERROR_CALL_NOT_IMPLEMENTED, system_category());
+}
+#endif
 
 #if !defined(BOOST_PROCESS_V2_HEADER_ONLY)
 template struct basic_process_handle_win<>;

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

@@ -182,7 +182,42 @@ struct basic_process_handle_fd
         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)

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

@@ -211,6 +211,42 @@ struct basic_process_handle_fd_or_signal
         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)
     {

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

@@ -180,6 +180,50 @@ struct basic_process_handle_signal
             detail::throw_error(ec, "request_exit");
     }
 
+    void interrupt(error_code &ec)
+    {
+        if (pid_ <= 0)
+            return ;
+        if (::kill(pid_, SIGTERM) == -1)
+            ec = get_last_error();
+    }
+
+    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)

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

@@ -32,6 +32,8 @@ 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);
@@ -176,6 +178,32 @@ struct basic_process_handle_win
             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))

include/boost/process/v2/impl/pid.ipp

@@ -6,12 +6,21 @@
 #define BOOST_PROCESS_V2_IMPL_PID_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/pid.hpp>
 
 #if defined(BOOST_PROCESS_V2_WINDOWS)
 #include <windows.h>
+#include <tlhelp32.h>
 #else
 #include <unistd.h>
+
+#if (defined(__APPLE__) && defined(__MACH__))
+#include <sys/proc_info.h>
+#include <libproc.h>
+#endif
+
 #endif
 
 BOOST_PROCESS_V2_BEGIN_NAMESPACE
@@ -22,6 +31,220 @@ pid_type current_pid() {return ::GetCurrentProcessId();}
 pid_type current_pid() {return ::getpid();}
 #endif
 
+#if defined(BOOST_PROCESS_V2_WINDOWS)
+std::vector<pid_type> all_pids(error_code & ec)
+{
+    std::vector<pid_type> vec;
+    HANDLE hp = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
+    if (!hp)
+    {
+        ec = detail::get_last_error();
+        return vec;
+    }
+
+    PROCESSENTRY32 pe;
+    pe.dwSize = sizeof(PROCESSENTRY32);
+    if (Process32First(hp, &pe)) {
+      do {
+        vec.push_back(pe.th32ProcessID);
+      } while (Process32Next(hp, &pe));
+    }
+    CloseHandle(hp);
+    return vec;
+}
+
+#elif (defined(__APPLE__) && defined(__MACH__))
+
+std::vector<pid_type> all_pids(error_code & ec)
+{
+    std::vector<pid_type> vec;
+    vec.resize(proc_listpids(PROC_ALL_PIDS, 0, nullptr, 0));
+
+    if (proc_listpids(PROC_ALL_PIDS, 0, &vec[0], sizeof(pid_type) * vec))
+    {
+        ec = detail::get_last_error();
+        return {};
+    }
+
+    auto itr = std::partition(vec.begin(), vec.end(), [](pid_type pt) {return pt != 0;});
+    vec.erase(itr, vec.end());
+    return vec;
+}
+
+#elif defined(__linux__)
+
+std::vector<pid_type> all_pids(error_code & ec)
+{
+    std::vector<pid_type> vec;
+    DIR *proc = opendir("/proc");
+    if (proc == nullptr)
+    {
+        ec = detail::get_last_error();
+        return vec;
+    } 
+    struct dirent *ent = nullptr;
+    while ((ent = readdir(proc) != nullptr)) 
+    {
+      if (!isdigit(*ent->d_name))
+        continue;
+      vec.push_back(atoi(ent->d_name));
+    }
+    closedir(proc);
+    return vec;
+}
+
+#elif defined(__FreeBSD__)
+
+std::vector<pid_type> all_pids(error_code & ec)
+{
+    std::vector<pid_type> vec;
+    int cntp = 0;
+    kinfo_proc *proc_info = kinfo_getallproc(&cntp);
+    if (proc_info) 
+    {
+      for (int i = 0; i < cntp; i++)
+        vec.push_back(proc_info[i].ki_pid);
+      free(proc_info);
+    }
+    else
+        ec = detail::get_last_error();
+    
+    return vec;
+}
+
+#elif defined(__DragonFly__)
+
+std::vector<pid_type> all_pids(error_code & ec)
+{
+    std::vector<pid_type> vec;
+    int cntp = 0;
+    kinfo_proc *proc_info = nullptr;
+    const char *nlistf, *memf;
+    nlistf = memf = "/dev/null";
+    kd = kvm_openfiles(nlistf, memf, nullptr, O_RDONLY, nullptr); 
+    if (!kd) 
+    {
+        ec = detail::get_last_error();
+        return vec;
+    }
+        
+    if ((proc_info = kvm_getprocs(kd, KERN_PROC_ALL, 0, &cntp))) 
+    {
+        vec.reserve(cntp);
+        for (int i = 0; i < cntp; i++) 
+            if (proc_info[i].kp_pid >= 0) 
+                vec.push_back(proc_info[i].kp_pid);
+    }
+    else
+        ec = detail::get_last_error();
+        
+    kvm_close(kd);
+    return vec;
+}
+
+#elif defined(__NetBSD__)
+
+std::vector<pid_type> all_pids(error_code & ec)
+{
+    std::vector<pid_type> vec;
+    int cntp = 0;
+    kinfo_proc2  *proc_info = nullptr;
+    kd = kvm_openfiles(nullptr, nullptr, nullptr, KVM_NO_FILES, nullptr);
+    if (!kd)
+    {
+        ec = detail::get_last_error();
+        return vec;
+    } 
+    if ((proc_info = kvm_getproc2(kd, KERN_PROC_ALL, 0, sizeof(struct kinfo_proc2), &cntp)))
+    {
+      vec.reserve(cntp);
+      for (int i = cntp - 1; i >= 0; i--) {
+        vec.push_back(proc_info[i].p_pid);
+      }
+    }
+    else
+        ec = detail::get_last_error();
+    kvm_close(kd);
+    return vec;
+}
+
+#elif defined(__OpenBSD__)
+
+std::vector<pid_type> all_pids(error_code & ec)
+{
+    std::vector<pid_type> vec;
+    int cntp = 0;
+    kinfo_proc *proc_info = nullptr;
+    kd = kvm_openfiles(nullptr, nullptr, nullptr, KVM_NO_FILES, nullptr);
+
+    if (!kd)
+    {
+        ec = detail::get_last_error();
+        return vec;
+    } 
+    if ((proc_info = kvm_getprocs(kd, KERN_PROC_ALL, 0, sizeof(struct kinfo_proc), &cntp)))
+    {
+      vec.reserve(cntp);
+      for (int i = 0; i < cntp; i++) {
+        if (proc_info[i].kp_pid >= 0) {
+          vec.push_back(proc_info[i].kp_pid);
+        }
+      }
+    }
+    else
+        ec = detail::get_last_error();
+    kvm_close(kd);
+    return vec;
+}
+
+#elif defined(__sun)
+
+std::vector<pid_type> all_pids(error_code & ec)
+{
+    std::vector<pid_type> vec;
+    struct pid cur_pid;
+    proc *proc_info = nullptr;
+    kd = kvm_open(nullptr, nullptr, nullptr, O_RDONLY, nullptr);
+    if (!kd)
+    {
+        ec = detail::get_last_error();
+        return vec;
+    } 
+    
+    while ((proc_info = kvm_nextproc(kd)))
+     {
+      if (kvm_kread(kd, (std::uintptr_t)proc_info->p_pidp, &cur_pid, sizeof(cur_pid)) != -1) {
+        vec.insert(vec.begin(), cur_pid.pid_id);
+      }
+      else
+      {
+        ec = detail::get_last_error();
+        break;
+      }
+    }
+    kvm_close(kd);
+    return vec;
+}
+
+
+#else
+#error "Platform not supported"
+
+
+#endif defined(BOOST_PROCESS_V2_WINDOWS)
+
+
+std::vector<pid_type> all_pids()
+{
+    error_code ec;
+    auto res = all_pids(ec);
+    if (ec)
+        detail::throw_error(ec, "all_pids");
+    return res;
+}
+
+
+
 BOOST_PROCESS_V2_END_NAMESPACE
 
 #endif //BOOST_PROCESS_V2_IMPL_PID_IPP

include/boost/process/v2/pid.hpp

@@ -6,6 +6,7 @@
 #define BOOST_PROCESS_V2_PID_HPP
 
 #include <boost/process/v2/detail/config.hpp>
+#include <boost/process/v2/detail/throw_error.hpp>
 
 BOOST_PROCESS_V2_BEGIN_NAMESPACE
 
@@ -31,6 +32,12 @@ typedef int pid_type;
 /// Get the process id of the current process.
 BOOST_PROCESS_V2_DECL pid_type current_pid();
 
+/// List all available pids.
+BOOST_PROCESS_V2_DECL std::vector<pid_type> all_pids(error_code & ec);
+
+/// List all available pids.
+BOOST_PROCESS_V2_DECL std::vector<pid_type> all_pids();
+
 BOOST_PROCESS_V2_END_NAMESPACE
 
 #if defined(BOOST_PROCESS_V2_HEADER_ONLY)

include/boost/process/v2/process.hpp

@@ -214,6 +214,37 @@ struct basic_process
     process_handle_.request_exit(ec);
   }
 
+  /// Send the process a signal requesting it to stop. This may rely on undocmented functions.
+  void suspend(error_code &ec)
+  {
+    process_handle_.suspend(ec);
+  }
+
+  /// Send the process a signal requesting it to stop. This may rely on undocmented functions.
+  void suspend()
+  {
+    error_code ec;
+    suspend(ec);
+    if (ec)
+        detail::throw_error(ec, "suspend");
+  }
+
+
+  /// Send the process a signal requesting it to resume. This may rely on undocmented functions.
+  void resume(error_code &ec)
+  {
+    process_handle_.resume(ec);  
+  }
+
+  /// Send the process a signal requesting it to resume. This may rely on undocmented functions.
+  void resume()
+  {
+      error_code ec;
+      suspend(ec);
+      if (ec)
+          detail::throw_error(ec, "resume");
+  }
+
   /// Throwing @overload void terminate(native_exit_code_type &exit_code, error_code & ec)
   void terminate()
   {

test/v2/Jamfile.jam

@@ -46,6 +46,7 @@ lib test_impl : test_impl.cpp filesystem :
         <link>static
         <target-os>windows:<source>shell32
         <target-os>windows:<source>user32
+        <target-os>windows:<source>Ntdll
         ;
 
 test-suite standalone :

test/v2/pid.cpp

@@ -12,4 +12,8 @@ BOOST_AUTO_TEST_CASE(test_pid)
 {
     namespace bp2 = boost::process::v2;
     BOOST_CHECK_NE(bp2::current_pid(), static_cast<bp2::pid_type>(0));
+
+    auto all = bp2::all_pids();
+    auto itr = std::find(all.begin(), all.end(), bp2::current_pid());
+    BOOST_CHECK(itr != all.end());
 }

test/v2/process.cpp

@@ -149,6 +149,8 @@ BOOST_AUTO_TEST_CASE(terminate)
   
   BOOST_CHECK_MESSAGE(!sh.empty(), sh);
   bpv::process proc(ctx, sh, {});
+  proc.suspend();
+  proc.resume();
   proc.terminate();
   proc.wait();
 }