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355
include/boost/process/v2/detail/process_handle_fd.hpp
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355
include/boost/process/v2/detail/process_handle_fd.hpp
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// 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_FD_HPP
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#define BOOST_PROCESS_V2_DETAIL_PROCESS_HANDLE_FD_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 <sys/syscall.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/compose.hpp>
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#include <asio/posix/basic_stream_descriptor.hpp>
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#include <asio/post.hpp>
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#else
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#include <boost/asio/any_io_executor.hpp>
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#include <boost/asio/compose.hpp>
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#include <boost/asio/posix/basic_stream_descriptor.hpp>
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#include <boost/asio/post.hpp>
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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_fd
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{
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using native_handle_type = int;
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typedef Executor executor_type;
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executor_type get_executor()
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{ return descriptor_.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_fd<Executor1> other;
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};
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template<typename ExecutionContext>
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basic_process_handle_fd(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>::type * = nullptr)
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: pid_(-1), descriptor_(context)
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{
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}
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basic_process_handle_fd(executor_type executor)
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: pid_(-1), descriptor_(executor)
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{
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}
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basic_process_handle_fd(executor_type executor, pid_type pid)
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: pid_(pid), descriptor_(executor, syscall(SYS_pidfd_open, pid, 0))
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{
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if (descriptor_.native_handle() == -1)
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detail::throw_error(detail::get_last_error(), "wait(pid)");
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}
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basic_process_handle_fd(executor_type executor, pid_type pid, native_handle_type process_handle)
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: pid_(pid), descriptor_(executor, process_handle)
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{
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}
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basic_process_handle_fd(basic_process_handle_fd &&handle)
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: pid_(handle.pid_), descriptor_(std::move(handle.descriptor_))
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{
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handle.pid_ = -1;
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}
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template<typename Executor1>
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basic_process_handle_fd(basic_process_handle_fd<Executor1> &&handle)
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: pid_(handle.pid_), descriptor_(std::move(handle.descriptor_))
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{
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handle.pid_ = -1;
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}
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basic_process_handle_fd& operator=(basic_process_handle_fd &&handle)
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{
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pid_ = handle.pid_;
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descriptor_ = std::move(handle.descriptor_);
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handle.pid_ = -1;
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return *this;
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}
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pid_type id() const
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{ return pid_; }
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native_handle_type native_handle() {return pid_;}
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void terminate_if_running(error_code &)
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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 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
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struct basic_process_handle_fd;
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pid_type pid_ = -1;
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net::posix::basic_stream_descriptor<Executor> descriptor_;
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struct async_wait_op_
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{
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net::posix::basic_descriptor<Executor> &descriptor;
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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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error_code ec;
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int wait_res = -1;
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if (pid_ <= 0) // error, complete early
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BOOST_PROCESS_V2_ASSIGN_EC(ec, net::error::bad_descriptor);
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else if (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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descriptor.async_wait(net::posix::descriptor_base::wait_read, std::move(self));
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return;
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}
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struct completer
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{
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error_code ec;
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typename std::decay<Self>::type self;
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void operator()()
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{
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self.complete(ec);
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}
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};
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net::dispatch(
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net::get_associated_immediate_executor(self, descriptor.get_executor()),
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completer{ec, std::move(self)});
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}
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template<typename Self>
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void operator()(Self &&self, error_code ec, int = 0)
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{
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if (!ec && process_is_running(exit_code))
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if (::waitpid(pid_, &exit_code, 0) == -1)
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ec = get_last_error();
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std::move(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_{descriptor_, pid_, exit_code}, handler, descriptor_))
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{
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return net::async_compose<WaitHandler, void(error_code)>(
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async_wait_op_{descriptor_, pid_, exit_code}, handler, descriptor_);
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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_HANDLE_FD_OR_SIGNAL_HPP
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