Current File : //backups/router/usr/local/include/boost/process/v1/detail/posix/is_running.hpp
// Copyright (c) 2016 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/v1/detail/config.hpp>
#include <boost/process/v1/detail/posix/child_handle.hpp>
#include <system_error>
#include <sys/wait.h>
namespace boost { namespace process { BOOST_PROCESS_V1_INLINE namespace v1 { namespace detail { namespace posix {
// Use the "stopped" state (WIFSTOPPED) to indicate "not terminated".
// This bit arrangement of status codes is not guaranteed by POSIX, but (according to comments in
// the glibc <bits/waitstatus.h> header) is the same across systems in practice.
constexpr int still_active = 0x017f;
static_assert(WIFSTOPPED(still_active), "Expected still_active to indicate WIFSTOPPED");
static_assert(!WIFEXITED(still_active), "Expected still_active to not indicate WIFEXITED");
static_assert(!WIFSIGNALED(still_active), "Expected still_active to not indicate WIFSIGNALED");
static_assert(!WIFCONTINUED(still_active), "Expected still_active to not indicate WIFCONTINUED");
inline bool is_running(int code)
{
return !WIFEXITED(code) && !WIFSIGNALED(code);
}
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);
if (ret == -1)
{
if (errno != ECHILD) //because it no child is running, then this one isn't either, obviously.
ec = ::boost::process::v1::detail::get_last_error();
return false;
}
else if (ret == 0)
return true;
else
{
ec.clear();
if (!is_running(status))
exit_code = status;
return false;
}
}
inline bool is_running(const child_handle &p, int & exit_code)
{
std::error_code ec;
bool b = is_running(p, exit_code, ec);
boost::process::v1::detail::throw_error(ec, "waitpid(2) failed in is_running");
return b;
}
inline int eval_exit_status(int code)
{
if (WIFEXITED(code))
{
return WEXITSTATUS(code);
}
else if (WIFSIGNALED(code))
{
return WTERMSIG(code);
}
else
{
return code;
}
}
}}}}}
#endif
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