| // |
| // 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 |