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//
// socket_select_interrupter.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2008 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 BOOST_ASIO_DETAIL_SOCKET_SELECT_INTERRUPTER_HPP
#define BOOST_ASIO_DETAIL_SOCKET_SELECT_INTERRUPTER_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/push_options.hpp>
#include <boost/asio/detail/push_options.hpp>
#include <cstdlib>
#include <boost/throw_exception.hpp>
#include <boost/system/system_error.hpp>
#include <boost/asio/detail/pop_options.hpp>
#include <boost/asio/error.hpp>
#include <boost/asio/detail/socket_holder.hpp>
#include <boost/asio/detail/socket_ops.hpp>
#include <boost/asio/detail/socket_types.hpp>
namespace boost {
namespace asio {
namespace detail {
class socket_select_interrupter
{
public:
// Constructor.
socket_select_interrupter()
{
boost::system::error_code ec;
socket_holder acceptor(socket_ops::socket(
AF_INET, SOCK_STREAM, IPPROTO_TCP, ec));
if (acceptor.get() == invalid_socket)
{
boost::system::system_error e(ec, "socket_select_interrupter");
boost::throw_exception(e);
}
int opt = 1;
socket_ops::setsockopt(acceptor.get(),
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 = inet_addr("127.0.0.1");
addr.sin_port = 0;
if (socket_ops::bind(acceptor.get(), (const socket_addr_type*)&addr,
addr_len, ec) == socket_error_retval)
{
boost::system::system_error e(ec, "socket_select_interrupter");
boost::throw_exception(e);
}
if (socket_ops::getsockname(acceptor.get(), (socket_addr_type*)&addr,
&addr_len, ec) == socket_error_retval)
{
boost::system::system_error e(ec, "socket_select_interrupter");
boost::throw_exception(e);
}
if (socket_ops::listen(acceptor.get(),
SOMAXCONN, ec) == socket_error_retval)
{
boost::system::system_error e(ec, "socket_select_interrupter");
boost::throw_exception(e);
}
socket_holder client(socket_ops::socket(
AF_INET, SOCK_STREAM, IPPROTO_TCP, ec));
if (client.get() == invalid_socket)
{
boost::system::system_error e(ec, "socket_select_interrupter");
boost::throw_exception(e);
}
if (socket_ops::connect(client.get(), (const socket_addr_type*)&addr,
addr_len, ec) == socket_error_retval)
{
boost::system::system_error e(ec, "socket_select_interrupter");
boost::throw_exception(e);
}
socket_holder server(socket_ops::accept(acceptor.get(), 0, 0, ec));
if (server.get() == invalid_socket)
{
boost::system::system_error e(ec, "socket_select_interrupter");
boost::throw_exception(e);
}
ioctl_arg_type non_blocking = 1;
if (socket_ops::ioctl(client.get(), FIONBIO, &non_blocking, ec))
{
boost::system::system_error e(ec, "socket_select_interrupter");
boost::throw_exception(e);
}
opt = 1;
socket_ops::setsockopt(client.get(),
IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt), ec);
non_blocking = 1;
if (socket_ops::ioctl(server.get(), FIONBIO, &non_blocking, ec))
{
boost::system::system_error e(ec, "socket_select_interrupter");
boost::throw_exception(e);
}
opt = 1;
socket_ops::setsockopt(server.get(),
IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt), ec);
read_descriptor_ = server.release();
write_descriptor_ = client.release();
}
// Destructor.
~socket_select_interrupter()
{
boost::system::error_code ec;
if (read_descriptor_ != invalid_socket)
socket_ops::close(read_descriptor_, ec);
if (write_descriptor_ != invalid_socket)
socket_ops::close(write_descriptor_, ec);
}
// Interrupt the select call.
void interrupt()
{
char byte = 0;
socket_ops::buf b;
socket_ops::init_buf(b, &byte, 1);
boost::system::error_code ec;
socket_ops::send(write_descriptor_, &b, 1, 0, ec);
}
// Reset the select interrupt. Returns true if the call was interrupted.
bool reset()
{
char data[1024];
socket_ops::buf b;
socket_ops::init_buf(b, data, sizeof(data));
boost::system::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;
}
// Get the read descriptor to be passed to select.
socket_type read_descriptor() const
{
return read_descriptor_;
}
private:
// The read end of a connection used to interrupt the select call. This file
// descriptor is passed to select such that when it is time to stop, a single
// byte will be written on the other end of the connection and this
// descriptor will become readable.
socket_type read_descriptor_;
// The write end of a connection used to interrupt the select call. A single
// byte may be written to this to wake up the select which is waiting for the
// other end to become readable.
socket_type write_descriptor_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_SOCKET_SELECT_INTERRUPTER_HPP
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