// Copyright (c) 2106 Klemens D. Morgenstern
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PROCESS_DETAIL_POSIX_IS_RUNNING_HPP
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#define BOOST_PROCESS_DETAIL_POSIX_IS_RUNNING_HPP
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#include <boost/process/detail/config.hpp>
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#include <boost/process/detail/posix/child_handle.hpp>
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#include <system_error>
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#include <sys/wait.h>
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namespace boost { namespace process { namespace detail { namespace posix {
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// Use the "stopped" state (WIFSTOPPED) to indicate "not terminated".
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// This bit arrangement of status codes is not guaranteed by POSIX, but (according to comments in
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// the glibc <bits/waitstatus.h> header) is the same across systems in practice.
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constexpr int still_active = 0x017f;
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static_assert(WIFSTOPPED(still_active), "Expected still_active to indicate WIFSTOPPED");
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static_assert(!WIFEXITED(still_active), "Expected still_active to not indicate WIFEXITED");
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static_assert(!WIFSIGNALED(still_active), "Expected still_active to not indicate WIFSIGNALED");
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static_assert(!WIFCONTINUED(still_active), "Expected still_active to not indicate WIFCONTINUED");
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inline bool is_running(int code)
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{
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return !WIFEXITED(code) && !WIFSIGNALED(code);
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}
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inline bool is_running(const child_handle &p, int & exit_code, std::error_code &ec) noexcept
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{
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int status;
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auto ret = ::waitpid(p.pid, &status, WNOHANG);
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if (ret == -1)
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{
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if (errno != ECHILD) //because it no child is running, than this one isn't either, obviously.
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ec = ::boost::process::detail::get_last_error();
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return false;
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}
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else if (ret == 0)
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return true;
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else
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{
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ec.clear();
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if (!is_running(status))
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exit_code = status;
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return false;
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}
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}
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inline bool is_running(const child_handle &p, int & exit_code)
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{
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std::error_code ec;
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bool b = is_running(p, exit_code, ec);
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boost::process::detail::throw_error(ec, "waitpid(2) failed in is_running");
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return b;
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}
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inline int eval_exit_status(int code)
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{
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if (WIFEXITED(code))
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{
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return WEXITSTATUS(code);
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}
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else if (WIFSIGNALED(code))
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{
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return WTERMSIG(code);
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}
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else
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{
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return code;
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}
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}
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}}}}
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#endif
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