forked from etc/pineapple-src
158 lines
4 KiB
C++
158 lines
4 KiB
C++
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// Copyright (c) 2006, 2007 Julio M. Merino Vidal
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// Copyright (c) 2008 Ilya Sokolov, Boris Schaeling
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// Copyright (c) 2009 Boris Schaeling
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// Copyright (c) 2010 Felipe Tanus, Boris Schaeling
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// Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling
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// Copyright (c) 2016 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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/**
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* \file boost/process/system.hpp
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*
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* Defines a system function.
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*/
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#ifndef BOOST_PROCESS_SYSTEM_HPP
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#define BOOST_PROCESS_SYSTEM_HPP
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#include <boost/process/detail/config.hpp>
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#include <boost/process/detail/on_exit.hpp>
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#include <boost/process/child.hpp>
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#include <boost/process/detail/async_handler.hpp>
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#include <boost/process/detail/execute_impl.hpp>
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#include <boost/asio/post.hpp>
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#include <type_traits>
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#include <mutex>
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#include <condition_variable>
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#if defined(BOOST_POSIX_API)
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#include <boost/process/posix.hpp>
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#endif
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namespace boost {
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namespace process {
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namespace detail
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{
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struct system_impl_success_check : handler
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{
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bool succeeded = false;
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template<typename Exec>
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void on_success(Exec &) { succeeded = true; }
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};
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template<typename IoService, typename ...Args>
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inline int system_impl(
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std::true_type, /*needs ios*/
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std::true_type, /*has io_context*/
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Args && ...args)
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{
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IoService & ios = ::boost::process::detail::get_io_context_var(args...);
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system_impl_success_check check;
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std::atomic_bool exited{false};
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child c(std::forward<Args>(args)...,
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check,
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::boost::process::on_exit(
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[&](int, const std::error_code&)
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{
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boost::asio::post(ios.get_executor(), [&]{exited.store(true);});
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}));
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if (!c.valid() || !check.succeeded)
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return -1;
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while (!exited.load())
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ios.poll();
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return c.exit_code();
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}
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template<typename IoService, typename ...Args>
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inline int system_impl(
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std::true_type, /*needs ios */
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std::false_type, /*has io_context*/
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Args && ...args)
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{
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IoService ios;
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child c(ios, std::forward<Args>(args)...);
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if (!c.valid())
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return -1;
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ios.run();
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if (c.running())
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c.wait();
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return c.exit_code();
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}
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template<typename IoService, typename ...Args>
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inline int system_impl(
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std::false_type, /*needs ios*/
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std::true_type, /*has io_context*/
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Args && ...args)
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{
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child c(std::forward<Args>(args)...);
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if (!c.valid())
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return -1;
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c.wait();
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return c.exit_code();
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}
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template<typename IoService, typename ...Args>
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inline int system_impl(
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std::false_type, /*has async */
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std::false_type, /*has io_context*/
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Args && ...args)
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{
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child c(std::forward<Args>(args)...
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#if defined(BOOST_POSIX_API)
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,::boost::process::posix::sig.dfl()
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#endif
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);
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if (!c.valid())
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return -1;
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c.wait();
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return c.exit_code();
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}
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}
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/** Launches a process and waits for its exit.
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It works as std::system, though it allows
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all the properties boost.process provides. It will execute the process and wait for it's exit; then return the exit_code.
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\code{.cpp}
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int ret = system("ls");
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\endcode
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\attention Using this function with synchronous pipes leads to many potential deadlocks.
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When using this function with an asynchronous properties and NOT passing an io_context object,
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the system function will create one and run it. When the io_context is passed to the function,
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the system function will check if it is active, and call the io_context::run function if not.
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*/
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template<typename ...Args>
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inline int system(Args && ...args)
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{
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typedef typename ::boost::process::detail::needs_io_context<Args...>::type
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need_ios;
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typedef typename ::boost::process::detail::has_io_context<Args...>::type
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has_ios;
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return ::boost::process::detail::system_impl<boost::asio::io_context>(
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need_ios(), has_ios(),
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std::forward<Args>(args)...);
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}
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}}
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#endif
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