130 lines
2.9 KiB
C++
130 lines
2.9 KiB
C++
//
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// detail/impl/pipe_select_interrupter.ipp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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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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#ifndef ASIO_DETAIL_IMPL_PIPE_SELECT_INTERRUPTER_IPP
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#define ASIO_DETAIL_IMPL_PIPE_SELECT_INTERRUPTER_IPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#if !defined(ASIO_WINDOWS_RUNTIME)
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#if !defined(ASIO_WINDOWS)
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#if !defined(__CYGWIN__)
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#if !defined(__SYMBIAN32__)
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#if !defined(ASIO_HAS_EVENTFD)
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "asio/detail/pipe_select_interrupter.hpp"
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#include "asio/detail/socket_types.hpp"
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#include "asio/detail/throw_error.hpp"
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#include "asio/error.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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pipe_select_interrupter::pipe_select_interrupter()
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{
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open_descriptors();
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}
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void pipe_select_interrupter::open_descriptors()
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{
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int pipe_fds[2];
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if (pipe(pipe_fds) == 0)
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{
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read_descriptor_ = pipe_fds[0];
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::fcntl(read_descriptor_, F_SETFL, O_NONBLOCK);
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write_descriptor_ = pipe_fds[1];
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::fcntl(write_descriptor_, F_SETFL, O_NONBLOCK);
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#if defined(FD_CLOEXEC)
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::fcntl(read_descriptor_, F_SETFD, FD_CLOEXEC);
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::fcntl(write_descriptor_, F_SETFD, FD_CLOEXEC);
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#endif // defined(FD_CLOEXEC)
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}
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else
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{
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asio::error_code ec(errno,
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asio::error::get_system_category());
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asio::detail::throw_error(ec, "pipe_select_interrupter");
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}
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}
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pipe_select_interrupter::~pipe_select_interrupter()
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{
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close_descriptors();
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}
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void pipe_select_interrupter::close_descriptors()
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{
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if (read_descriptor_ != -1)
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::close(read_descriptor_);
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if (write_descriptor_ != -1)
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::close(write_descriptor_);
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}
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void pipe_select_interrupter::recreate()
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{
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close_descriptors();
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write_descriptor_ = -1;
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read_descriptor_ = -1;
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open_descriptors();
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}
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void pipe_select_interrupter::interrupt()
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{
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char byte = 0;
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signed_size_type result = ::write(write_descriptor_, &byte, 1);
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(void)result;
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}
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bool pipe_select_interrupter::reset()
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{
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for (;;)
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{
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char data[1024];
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signed_size_type bytes_read = ::read(read_descriptor_, data, sizeof(data));
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if (bytes_read == sizeof(data))
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continue;
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if (bytes_read > 0)
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return true;
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if (bytes_read == 0)
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return false;
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if (errno == EINTR)
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continue;
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if (errno == EWOULDBLOCK || errno == EAGAIN)
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return true;
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return false;
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}
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}
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // !defined(ASIO_HAS_EVENTFD)
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#endif // !defined(__SYMBIAN32__)
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#endif // !defined(__CYGWIN__)
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#endif // !defined(ASIO_WINDOWS)
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#endif // !defined(ASIO_WINDOWS_RUNTIME)
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#endif // ASIO_DETAIL_IMPL_PIPE_SELECT_INTERRUPTER_IPP
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