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//
// detail/impl/socket_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_SOCKET_SELECT_INTERRUPTER_IPP
#define ASIO_DETAIL_IMPL_SOCKET_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) \
|| defined(__CYGWIN__) \
|| defined(__SYMBIAN32__)
#include <cstdlib>
#include "asio/detail/socket_holder.hpp"
#include "asio/detail/socket_ops.hpp"
#include "asio/detail/socket_select_interrupter.hpp"
#include "asio/detail/throw_error.hpp"
#include "asio/error.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
socket_select_interrupter::socket_select_interrupter()
{
open_descriptors();
}
void socket_select_interrupter::open_descriptors()
{
asio::error_code ec;
socket_holder acceptor(socket_ops::socket(
AF_INET, SOCK_STREAM, IPPROTO_TCP, ec));
if (acceptor.get() == invalid_socket)
asio::detail::throw_error(ec, "socket_select_interrupter");
int opt = 1;
socket_ops::state_type acceptor_state = 0;
socket_ops::setsockopt(acceptor.get(), acceptor_state,
SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt), ec);
using namespace std; // For memset.
sockaddr_in4_type addr;
std::size_t addr_len = sizeof(addr);
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = socket_ops::host_to_network_long(INADDR_LOOPBACK);
addr.sin_port = 0;
if (socket_ops::bind(acceptor.get(), (const socket_addr_type*)&addr,
addr_len, ec) == socket_error_retval)
asio::detail::throw_error(ec, "socket_select_interrupter");
if (socket_ops::getsockname(acceptor.get(), (socket_addr_type*)&addr,
&addr_len, ec) == socket_error_retval)
asio::detail::throw_error(ec, "socket_select_interrupter");
// Some broken firewalls on Windows will intermittently cause getsockname to
// return 0.0.0.0 when the socket is actually bound to 127.0.0.1. We
// explicitly specify the target address here to work around this problem.
if (addr.sin_addr.s_addr == socket_ops::host_to_network_long(INADDR_ANY))
addr.sin_addr.s_addr = socket_ops::host_to_network_long(INADDR_LOOPBACK);
if (socket_ops::listen(acceptor.get(),
SOMAXCONN, ec) == socket_error_retval)
asio::detail::throw_error(ec, "socket_select_interrupter");
socket_holder client(socket_ops::socket(
AF_INET, SOCK_STREAM, IPPROTO_TCP, ec));
if (client.get() == invalid_socket)
asio::detail::throw_error(ec, "socket_select_interrupter");
if (socket_ops::connect(client.get(), (const socket_addr_type*)&addr,
addr_len, ec) == socket_error_retval)
asio::detail::throw_error(ec, "socket_select_interrupter");
socket_holder server(socket_ops::accept(acceptor.get(), 0, 0, ec));
if (server.get() == invalid_socket)
asio::detail::throw_error(ec, "socket_select_interrupter");
ioctl_arg_type non_blocking = 1;
socket_ops::state_type client_state = 0;
if (socket_ops::ioctl(client.get(), client_state,
FIONBIO, &non_blocking, ec))
asio::detail::throw_error(ec, "socket_select_interrupter");
opt = 1;
socket_ops::setsockopt(client.get(), client_state,
IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt), ec);
non_blocking = 1;
socket_ops::state_type server_state = 0;
if (socket_ops::ioctl(server.get(), server_state,
FIONBIO, &non_blocking, ec))
asio::detail::throw_error(ec, "socket_select_interrupter");
opt = 1;
socket_ops::setsockopt(server.get(), server_state,
IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt), ec);
read_descriptor_ = server.release();
write_descriptor_ = client.release();
}
socket_select_interrupter::~socket_select_interrupter()
{
close_descriptors();
}
void socket_select_interrupter::close_descriptors()
{
asio::error_code ec;
socket_ops::state_type state = socket_ops::internal_non_blocking;
if (read_descriptor_ != invalid_socket)
socket_ops::close(read_descriptor_, state, true, ec);
if (write_descriptor_ != invalid_socket)
socket_ops::close(write_descriptor_, state, true, ec);
}
void socket_select_interrupter::recreate()
{
close_descriptors();
write_descriptor_ = invalid_socket;
read_descriptor_ = invalid_socket;
open_descriptors();
}
void socket_select_interrupter::interrupt()
{
char byte = 0;
socket_ops::buf b;
socket_ops::init_buf(b, &byte, 1);
asio::error_code ec;
socket_ops::send(write_descriptor_, &b, 1, 0, ec);
}
bool socket_select_interrupter::reset()
{
char data[1024];
socket_ops::buf b;
socket_ops::init_buf(b, data, sizeof(data));
asio::error_code ec;
int bytes_read = socket_ops::recv(read_descriptor_, &b, 1, 0, ec);
bool was_interrupted = (bytes_read > 0);
while (bytes_read == sizeof(data))
bytes_read = socket_ops::recv(read_descriptor_, &b, 1, 0, ec);
return was_interrupted;
}
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // defined(ASIO_WINDOWS)
// || defined(__CYGWIN__)
// || defined(__SYMBIAN32__)
#endif // !defined(ASIO_WINDOWS_RUNTIME)
#endif // ASIO_DETAIL_IMPL_SOCKET_SELECT_INTERRUPTER_IPP
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