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//
// detail/impl/pipe_select_interrupter.ipp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// 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)
//
#ifndef ASIO_DETAIL_IMPL_PIPE_SELECT_INTERRUPTER_IPP
#define ASIO_DETAIL_IMPL_PIPE_SELECT_INTERRUPTER_IPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#if !defined(ASIO_WINDOWS_RUNTIME)
#if !defined(ASIO_WINDOWS)
#if !defined(__CYGWIN__)
#if !defined(__SYMBIAN32__)
#if !defined(ASIO_HAS_EVENTFD)
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "asio/detail/pipe_select_interrupter.hpp"
#include "asio/detail/socket_types.hpp"
#include "asio/detail/throw_error.hpp"
#include "asio/error.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
pipe_select_interrupter::pipe_select_interrupter()
{
open_descriptors();
}
void pipe_select_interrupter::open_descriptors()
{
int pipe_fds[2];
if (pipe(pipe_fds) == 0)
{
read_descriptor_ = pipe_fds[0];
::fcntl(read_descriptor_, F_SETFL, O_NONBLOCK);
write_descriptor_ = pipe_fds[1];
::fcntl(write_descriptor_, F_SETFL, O_NONBLOCK);
#if defined(FD_CLOEXEC)
::fcntl(read_descriptor_, F_SETFD, FD_CLOEXEC);
::fcntl(write_descriptor_, F_SETFD, FD_CLOEXEC);
#endif // defined(FD_CLOEXEC)
}
else
{
asio::error_code ec(errno,
asio::error::get_system_category());
asio::detail::throw_error(ec, "pipe_select_interrupter");
}
}
pipe_select_interrupter::~pipe_select_interrupter()
{
close_descriptors();
}
void pipe_select_interrupter::close_descriptors()
{
if (read_descriptor_ != -1)
::close(read_descriptor_);
if (write_descriptor_ != -1)
::close(write_descriptor_);
}
void pipe_select_interrupter::recreate()
{
close_descriptors();
write_descriptor_ = -1;
read_descriptor_ = -1;
open_descriptors();
}
void pipe_select_interrupter::interrupt()
{
char byte = 0;
signed_size_type result = ::write(write_descriptor_, &byte, 1);
(void)result;
}
bool pipe_select_interrupter::reset()
{
for (;;)
{
char data[1024];
signed_size_type bytes_read = ::read(read_descriptor_, data, sizeof(data));
if (bytes_read < 0 && errno == EINTR)
continue;
bool was_interrupted = (bytes_read > 0);
while (bytes_read == sizeof(data))
bytes_read = ::read(read_descriptor_, data, sizeof(data));
return was_interrupted;
}
}
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // !defined(ASIO_HAS_EVENTFD)
#endif // !defined(__SYMBIAN32__)
#endif // !defined(__CYGWIN__)
#endif // !defined(ASIO_WINDOWS)
#endif // !defined(ASIO_WINDOWS_RUNTIME)
#endif // ASIO_DETAIL_IMPL_PIPE_SELECT_INTERRUPTER_IPP
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