1 files changed, 78 insertions, 0 deletions
diff --git a/boost/process/detail/posix/is_running.hpp b/boost/process/detail/posix/is_running.hpp
new file mode 100644
index 0000000000..e8a009dd22
--- /dev/null
+++ b/boost/process/detail/posix/is_running.hpp
@@ -0,0 +1,78 @@
+// Copyright (c) 2106 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_DETAIL_POSIX_IS_RUNNING_HPP
+#define BOOST_PROCESS_DETAIL_POSIX_IS_RUNNING_HPP
+
+#include <boost/process/detail/config.hpp>
+#include <boost/process/detail/posix/child_handle.hpp>
+#include <system_error>
+#include <sys/wait.h>
+
+namespace boost { namespace process { namespace detail { namespace posix {
+
+
+constexpr int still_active = 0x7F;
+static_assert(!WIFEXITED(still_active), "Internal Error");
+
+inline bool is_running(const child_handle &p, int & exit_code)
+{
+    int status; 
+    auto ret = ::waitpid(p.pid, &status, WNOHANG|WUNTRACED);
+    
+    if (ret == -1)
+    {
+        if (errno != ECHILD) //because it no child is running, than this one isn't either, obviously.
+            ::boost::process::detail::throw_last_error("is_running error");
+
+        return false;
+    }
+    else if (ret == 0)
+        return true;
+    else //exited
+    {
+        if (WIFEXITED(status))
+            exit_code = status;
+        return false;
+    }
+}
+
+inline bool is_running(const child_handle &p, int & exit_code, std::error_code &ec) noexcept
+{
+    int status;
+    auto ret = ::waitpid(p.pid, &status, WNOHANG|WUNTRACED); 
+    
+    if (ret == -1)
+    {
+        if (errno != ECHILD) //because it no child is running, than this one isn't either, obviously.
+            ec = ::boost::process::detail::get_last_error();
+        return false;
+    }
+    else if (ret == 0)
+        return true;
+    else
+    {
+        ec.clear();
+        
+        if (WIFEXITED(status))
+            exit_code = status;
+        
+        return false;
+    }
+}
+
+inline bool is_running(int code)
+{
+    return !WIFEXITED(code);
+}
+
+inline int eval_exit_status(int code)
+{
+    return WEXITSTATUS(code);
+}
+
+}}}}
+
+#endif