388 lines
10 KiB
C++
388 lines
10 KiB
C++
// Copyright (c) 2022 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_V2_DETAIL_PROCESS_HANDLE_SIGNAL_HPP
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#define BOOST_PROCESS_V2_DETAIL_PROCESS_HANDLE_SIGNAL_HPP
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#include <boost/process/v2/detail/config.hpp>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <boost/process/v2/detail/last_error.hpp>
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#include <boost/process/v2/detail/throw_error.hpp>
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#include <boost/process/v2/exit_code.hpp>
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#include <boost/process/v2/pid.hpp>
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#if defined(BOOST_PROCESS_V2_STANDALONE)
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#include <asio/any_io_executor.hpp>
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#include <asio/append.hpp>
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#include <asio/associated_immediate_executor.hpp>
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#include <asio/compose.hpp>
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#include <asio/dispatch.hpp>
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#include <asio/post.hpp>
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#if !defined(BOOST_PROCESS_V2_DISABLE_SIGNALSET)
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#include <asio/signal_set.hpp>
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#endif
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#else
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#include <boost/asio/any_io_executor.hpp>
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#include <boost/asio/append.hpp>
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#include <boost/asio/associated_immediate_executor.hpp>
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#include <boost/asio/compose.hpp>
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#include <boost/asio/dispatch.hpp>
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#include <boost/asio/post.hpp>
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#if !defined(BOOST_PROCESS_V2_DISABLE_SIGNALSET)
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#include <boost/asio/signal_set.hpp>
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#endif
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#endif
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BOOST_PROCESS_V2_BEGIN_NAMESPACE
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namespace detail
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{
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template<typename Executor = net::any_io_executor>
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struct basic_process_handle_signal
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{
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struct native_handle_type
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{
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native_handle_type() = delete;
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native_handle_type(const native_handle_type & ) = delete;
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~native_handle_type() = default;
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};
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typedef Executor executor_type;
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executor_type get_executor()
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{ return signal_set_.get_executor(); }
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/// Rebinds the process_handle to another executor.
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template<typename Executor1>
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struct rebind_executor
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{
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/// The socket type when rebound to the specified executor.
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typedef basic_process_handle_signal<Executor1> other;
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};
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template<typename ExecutionContext>
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basic_process_handle_signal(ExecutionContext &context,
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typename std::enable_if<
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std::is_convertible<ExecutionContext &,
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net::execution_context &>::value
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>::type * = nullptr)
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: pid_(-1), signal_set_(context, SIGCHLD)
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{
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}
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basic_process_handle_signal(Executor executor)
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: pid_(-1), signal_set_(executor, SIGCHLD)
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{
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}
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basic_process_handle_signal(Executor executor, pid_type pid)
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: pid_(pid), signal_set_(executor, SIGCHLD)
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{
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}
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basic_process_handle_signal(basic_process_handle_signal && handle)
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: pid_(handle.pid_), signal_set_(handle.signal_set_.get_executor(), SIGCHLD)
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{
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handle.pid_ = -1;
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}
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basic_process_handle_signal& operator=(basic_process_handle_signal && handle)
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{
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pid_ = handle.id();
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#if !defined(BOOST_PROCESS_V2_DISABLE_SIGNALSET)
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signal_set_.~basic_signal_set();
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using ss = net::basic_signal_set<Executor>;
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new (&signal_set_) ss(handle.get_executor(), SIGCHLD);
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#else
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signal_set_.executor = handle.signal_set_.executor;
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#endif
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handle.pid_ = -1;
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return *this;
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}
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template<typename Executor1>
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basic_process_handle_signal(basic_process_handle_signal<Executor1> && handle)
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: pid_(handle.pid_), signal_set_(Executor1(handle.signal_set_.get_executor()), SIGCHLD)
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{
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handle.pid_ = -1;
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}
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pid_type id() const { return pid_; }
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native_handle_type native_handle() {return {};}
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void terminate_if_running(error_code &)
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{
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terminate_if_running();
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}
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void terminate_if_running()
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{
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if (pid_ <= 0)
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return;
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if (::waitpid(pid_, nullptr, WNOHANG) == 0)
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{
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::kill(pid_, SIGKILL);
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::waitpid(pid_, nullptr, 0);
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}
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}
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void wait(native_exit_code_type &exit_status, error_code &ec)
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{
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if (pid_ <= 0)
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return;
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while (::waitpid(pid_, &exit_status, 0) < 0)
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{
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if (errno != EINTR)
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{
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ec = get_last_error();
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break;
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}
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}
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}
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void wait(native_exit_code_type &exit_status)
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{
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if (pid_ <= 0)
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return;
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error_code ec;
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wait(exit_status, ec);
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if (ec)
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detail::throw_error(ec, "wait(pid)");
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}
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void interrupt(error_code &ec)
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{
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if (pid_ <= 0)
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return;
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if (::kill(pid_, SIGINT) == -1)
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ec = get_last_error();
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}
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void interrupt()
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{
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if (pid_ <= 0)
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return;
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error_code ec;
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interrupt(ec);
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if (ec)
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detail::throw_error(ec, "interrupt");
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}
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void request_exit(error_code &ec)
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{
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if (pid_ <= 0)
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return;
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if (::kill(pid_, SIGTERM) == -1)
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ec = get_last_error();
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}
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void request_exit()
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{
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if (pid_ <= 0)
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return;
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error_code ec;
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request_exit(ec);
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if (ec)
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detail::throw_error(ec, "request_exit");
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}
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void suspend()
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{
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if (pid_ <= 0)
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return;
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error_code ec;
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suspend(ec);
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if (ec)
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detail::throw_error(ec, "suspend");
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}
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void suspend(error_code &ec)
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{
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if (pid_ <= 0)
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return;
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if (::kill(pid_, SIGSTOP) == -1)
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ec = get_last_error();
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}
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void resume()
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{
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if (pid_ <= 0)
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return;
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error_code ec;
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resume(ec);
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if (ec)
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detail::throw_error(ec, "resume");
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}
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void resume(error_code &ec)
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{
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if (pid_ <= 0)
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return;
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if (::kill(pid_, SIGCONT) == -1)
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ec = get_last_error();
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}
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void terminate(native_exit_code_type &exit_status, error_code &ec)
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{
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if (pid_ <= 0)
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return;
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if (::kill(pid_, SIGKILL) == -1)
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ec = get_last_error();
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else
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wait(exit_status, ec);
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}
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void terminate(native_exit_code_type &exit_status)
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{
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if (pid_ <= 0)
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return;
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error_code ec;
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terminate(exit_status, ec);
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if (ec)
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detail::throw_error(ec, "terminate");
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}
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bool running(native_exit_code_type &exit_code, error_code & ec)
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{
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if (pid_ <= 0)
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return false;
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int code = 0;
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int res = ::waitpid(pid_, &code, WNOHANG);
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if (res == -1)
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ec = get_last_error();
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else if (res == 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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exit_code = code;
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}
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return false;
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}
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bool running(native_exit_code_type &exit_code)
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{
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if (pid_ <= 0)
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return false;
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error_code ec;
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bool res = running(exit_code, ec);
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if (ec)
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detail::throw_error(ec, "is_running");
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return res;
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}
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bool is_open() const
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{
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return pid_ != -1;
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}
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private:
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template<typename>
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friend struct basic_process_handle_signal;
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pid_type pid_ = -1;
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#if !defined(BOOST_PROCESS_V2_DISABLE_SIGNALSET)
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net::basic_signal_set<Executor> signal_set_;
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#else
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struct signal_set_dummy_
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{
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signal_set_dummy_(signal_set_dummy_ &&) = default;
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signal_set_dummy_(const signal_set_dummy_ &) = default;
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Executor executor;
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using executor_type = Executor;
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executor_type get_executor() {return executor;}
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signal_set_dummy_(Executor executor, int) : executor(std::move(executor)) {}
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};
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signal_set_dummy_ signal_set_;
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#endif
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struct async_wait_op_
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{
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#if !defined(BOOST_PROCESS_V2_DISABLE_SIGNALSET)
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net::basic_signal_set<Executor> &handle;
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pid_type pid_;
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native_exit_code_type & exit_code;
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template<typename Self>
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void operator()(Self &&self)
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{
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self.reset_cancellation_state(asio::enable_total_cancellation());
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handle.async_wait(std::move(self));
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handle.cancel();
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// we cancel so we end up on the signal-sets executor
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}
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template<typename Self>
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void operator()(Self &&self, error_code ec, int /*sig*/)
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{
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if (ec == net::error::operation_aborted &&
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self.get_cancellation_state().cancelled()
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== net::cancellation_type::none)
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ec.clear();
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int wait_res = -1;
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if (pid_ <= 0) // error, complete early
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ec = net::error::bad_descriptor;
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else if (!ec && process_is_running(exit_code))
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{
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wait_res = ::waitpid(pid_, &exit_code, WNOHANG);
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if (wait_res == -1)
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ec = get_last_error();
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}
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if (!ec && (wait_res == 0))
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{
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handle.async_wait(std::move(self));
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return;
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}
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const auto exec = self.get_executor();
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net::dispatch(exec, net::append(std::move(self), ec));
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}
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#else
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signal_set_dummy_ dummy_;
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pid_t pid;
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template<typename Self>
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void operator()(Self &&self)
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{
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auto exec = net::get_associated_immediate_executor(self, dummy_.get_executor());
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error_code ec;
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BOOST_PROCESS_V2_ASSIGN_EC(ec, net::error::operation_not_supported);
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net::dispatch(exec, net::append(std::move(self), native_exit_code_type(), ec));
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}
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#endif
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template<typename Self>
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void operator()(Self &&self, error_code ec)
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{
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self.complete(ec);
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}
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};
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public:
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template<BOOST_PROCESS_V2_COMPLETION_TOKEN_FOR(void(error_code))
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WaitHandler = net::default_completion_token_t<executor_type>>
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auto async_wait(native_exit_code_type & exit_code,
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WaitHandler &&handler = net::default_completion_token_t<executor_type>())
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-> decltype(net::async_compose<WaitHandler, void(error_code)>(
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async_wait_op_{signal_set_, pid_, exit_code}, handler, signal_set_))
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{
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return net::async_compose<WaitHandler, void(error_code)>(
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async_wait_op_{signal_set_, pid_, exit_code}, handler, signal_set_);
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}
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};
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}
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BOOST_PROCESS_V2_END_NAMESPACE
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#endif //BOOST_PROCESS_V2_DETAIL_PROCESS_HANDLE_SIGNAL_HPP
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