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// Copyright (c) 2006, 2007 Julio M. Merino Vidal
// Copyright (c) 2008 Ilya Sokolov, Boris Schaeling
// Copyright (c) 2009 Boris Schaeling
// Copyright (c) 2010 Felipe Tanus, Boris Schaeling
// Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling
//
// 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_WAIT_FOR_EXIT_HPP
#define BOOST_PROCESS_DETAIL_POSIX_WAIT_FOR_EXIT_HPP
#include <boost/process/detail/config.hpp>
#include <boost/process/detail/posix/child_handle.hpp>
#include <system_error>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
namespace boost { namespace process { namespace detail { namespace posix {
inline void wait(const child_handle &p, int & exit_code, std::error_code &ec) noexcept
{
pid_t ret;
int status;
do
{
ret = ::waitpid(p.pid, &status, 0);
}
while (((ret == -1) && (errno == EINTR)) ||
(ret != -1 && !WIFEXITED(status) && !WIFSIGNALED(status)));
if (ret == -1)
ec = boost::process::detail::get_last_error();
else
{
ec.clear();
exit_code = status;
}
}
inline void wait(const child_handle &p, int & exit_code) noexcept
{
std::error_code ec;
wait(p, exit_code, ec);
boost::process::detail::throw_error(ec, "waitpid(2) failed in wait");
}
template< class Clock, class Duration >
inline bool wait_until(
const child_handle &p,
int & exit_code,
const std::chrono::time_point<Clock, Duration>& time_out,
std::error_code & ec) noexcept
{
::sigset_t sigset;
//I need to set the signal, because it might be ignore / default, in which case sigwait might not work.
using _signal_t = void(*)(int);
static thread_local _signal_t sigchld_handler = SIG_DFL;
struct signal_interceptor_t
{
static void handler_func(int val)
{
if ((sigchld_handler != SIG_DFL) && (sigchld_handler != SIG_IGN))
sigchld_handler(val);
}
signal_interceptor_t() { sigchld_handler = ::signal(SIGCHLD, &handler_func); }
~signal_interceptor_t() { ::signal(SIGCHLD, sigchld_handler); sigchld_handler = SIG_DFL;}
} signal_interceptor{};
if (sigemptyset(&sigset) != 0)
{
ec = get_last_error();
return false;
}
if (sigaddset(&sigset, SIGCHLD) != 0)
{
ec = get_last_error();
return false;
}
auto get_timespec =
[](const Duration & dur)
{
::timespec ts;
ts.tv_sec = std::chrono::duration_cast<std::chrono::seconds>(dur).count();
ts.tv_nsec = std::chrono::duration_cast<std::chrono::nanoseconds>(dur).count() % 1000000000;
return ts;
};
int ret;
int status{0};
struct ::sigaction old_sig;
if (-1 == ::sigaction(SIGCHLD, nullptr, &old_sig))
{
ec = get_last_error();
return false;
}
bool timed_out;
#if defined(BOOST_POSIX_HAS_SIGTIMEDWAIT)
do
{
auto ts = get_timespec(time_out - Clock::now());
auto ret_sig = ::sigtimedwait(&sigset, nullptr, &ts);
errno = 0;
ret = ::waitpid(p.pid, &status, WNOHANG);
if ((ret_sig == SIGCHLD) && (old_sig.sa_handler != SIG_DFL) && (old_sig.sa_handler != SIG_IGN))
old_sig.sa_handler(ret);
if (ret == 0)
{
timed_out = Clock::now() >= time_out;
if (timed_out)
return false;
}
}
while ((ret == 0) ||
(((ret == -1) && errno == EINTR) ||
((ret != -1) && !WIFEXITED(status) && !WIFSIGNALED(status))));
#else
//if we do not have sigtimedwait, we fork off a child process to get the signal in time
pid_t timeout_pid = ::fork();
if (timeout_pid == -1)
{
ec = boost::process::detail::get_last_error();
return true;
}
else if (timeout_pid == 0)
{
auto ts = get_timespec(time_out - Clock::now());
::timespec rem;
while (ts.tv_sec > 0 || ts.tv_nsec > 0)
{
if (::nanosleep(&ts, &rem) != 0)
{
auto err = errno;
if ((err == EINVAL) || (err == EFAULT))
break;
}
ts = get_timespec(time_out - Clock::now());
}
::exit(0);
}
struct child_cleaner_t
{
pid_t pid;
~child_cleaner_t()
{
int res;
::kill(pid, SIGKILL);
::waitpid(pid, &res, WNOHANG);
}
};
child_cleaner_t child_cleaner{timeout_pid};
do
{
int sig_{0};
if ((::waitpid(timeout_pid, &status, WNOHANG) != 0)
&& (WIFEXITED(status) || WIFSIGNALED(status)))
return false;
ret = ::sigwait(&sigset, &sig_);
errno = 0;
if ((sig_ == SIGCHLD) &&
(old_sig.sa_handler != SIG_DFL) && (old_sig.sa_handler != SIG_IGN))
old_sig.sa_handler(ret);
ret = ::waitpid(p.pid, &status, WNOHANG);
if (ret == 0) // == > is running
{
timed_out = Clock::now() >= time_out;
if (timed_out)
return false;
}
}
while ((ret == 0) ||
(((ret == -1) && errno == EINTR) ||
((ret != -1) && !WIFEXITED(status) && !WIFSIGNALED(status))));
#endif
if (ret == -1)
ec = boost::process::detail::get_last_error();
else
{
ec.clear();
exit_code = status;
}
return true;
}
template< class Clock, class Duration >
inline bool wait_until(
const child_handle &p,
int & exit_code,
const std::chrono::time_point<Clock, Duration>& time_out)
{
std::error_code ec;
bool b = wait_until(p, exit_code, time_out, ec);
boost::process::detail::throw_error(ec, "waitpid(2) failed in wait_until");
return b;
}
template< class Rep, class Period >
inline bool wait_for(
const child_handle &p,
int & exit_code,
const std::chrono::duration<Rep, Period>& rel_time,
std::error_code & ec) noexcept
{
return wait_until(p, exit_code, std::chrono::steady_clock::now() + rel_time, ec);
}
template< class Rep, class Period >
inline bool wait_for(
const child_handle &p,
int & exit_code,
const std::chrono::duration<Rep, Period>& rel_time)
{
std::error_code ec;
bool b = wait_for(p, exit_code, rel_time, ec);
boost::process::detail::throw_error(ec, "waitpid(2) failed in wait_for");
return b;
}
}}}}
#endif
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