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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
// 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)
/**
* \file boost/process/system.hpp
*
* Defines a system function.
*/
#ifndef BOOST_PROCESS_SYSTEM_HPP
#define BOOST_PROCESS_SYSTEM_HPP
#include <boost/process/detail/config.hpp>
#include <boost/process/detail/on_exit.hpp>
#include <boost/process/child.hpp>
#include <boost/process/detail/async_handler.hpp>
#include <boost/process/detail/execute_impl.hpp>
#include <type_traits>
#include <mutex>
#include <condition_variable>
#if defined(BOOST_POSIX_API)
#include <boost/process/posix.hpp>
#endif
namespace boost {
namespace process {
namespace detail
{
struct system_impl_success_check : handler
{
bool succeeded = false;
template<typename Exec>
void on_success(Exec &) { succeeded = true; }
};
template<typename IoService, typename ...Args>
inline int system_impl(
std::true_type, /*needs ios*/
std::true_type, /*has io_context*/
Args && ...args)
{
IoService & ios = ::boost::process::detail::get_io_context_var(args...);
system_impl_success_check check;
std::atomic_bool exited{false};
child c(std::forward<Args>(args)...,
check,
::boost::process::on_exit(
[&](int, const std::error_code&)
{
ios.post([&]{exited.store(true);});
}));
if (!c.valid() || !check.succeeded)
return -1;
while (!exited.load())
ios.poll();
return c.exit_code();
}
template<typename IoService, typename ...Args>
inline int system_impl(
std::true_type, /*needs ios */
std::false_type, /*has io_context*/
Args && ...args)
{
IoService ios;
child c(ios, std::forward<Args>(args)...);
if (!c.valid())
return -1;
ios.run();
return c.exit_code();
}
template<typename IoService, typename ...Args>
inline int system_impl(
std::false_type, /*needs ios*/
std::true_type, /*has io_context*/
Args && ...args)
{
child c(std::forward<Args>(args)...);
if (!c.valid())
return -1;
c.wait();
return c.exit_code();
}
template<typename IoService, typename ...Args>
inline int system_impl(
std::false_type, /*has async */
std::false_type, /*has io_context*/
Args && ...args)
{
child c(std::forward<Args>(args)...
#if defined(BOOST_POSIX_API)
,::boost::process::posix::sig.dfl()
#endif
);
if (!c.valid())
return -1;
c.wait();
return c.exit_code();
}
}
/** Launches a process and waits for its exit.
It works as std::system, though it allows
all the properties boost.process provides. It will execute the process and wait for it's exit; then return the exit_code.
\code{.cpp}
int ret = system("ls");
\endcode
\attention Using this function with synchronous pipes leads to many potential deadlocks.
When using this function with an asynchronous properties and NOT passing an io_context object,
the system function will create one and run it. When the io_context is passed to the function,
the system function will check if it is active, and call the io_context::run function if not.
*/
template<typename ...Args>
inline int system(Args && ...args)
{
typedef typename ::boost::process::detail::needs_io_context<Args...>::type
need_ios;
typedef typename ::boost::process::detail::has_io_context<Args...>::type
has_ios;
return ::boost::process::detail::system_impl<boost::asio::io_context>(
need_ios(), has_ios(),
std::forward<Args>(args)...);
}
}}
#endif
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