boost/asio/detail/reactive_socket_service.hpp
// // reactive_socket_service.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_REACTIVE_SOCKET_SERVICE_HPP #define BOOST_ASIO_DETAIL_REACTIVE_SOCKET_SERVICE_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 <boost/shared_ptr.hpp> #include <boost/asio/detail/pop_options.hpp> #include <boost/asio/buffer.hpp> #include <boost/asio/error.hpp> #include <boost/asio/io_service.hpp> #include <boost/asio/socket_base.hpp> #include <boost/asio/detail/bind_handler.hpp> #include <boost/asio/detail/handler_base_from_member.hpp> #include <boost/asio/detail/noncopyable.hpp> #include <boost/asio/detail/service_base.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 { template <typename Protocol, typename Reactor> class reactive_socket_service : public boost::asio::detail::service_base< reactive_socket_service<Protocol, Reactor> > { public: // The protocol type. typedef Protocol protocol_type; // The endpoint type. typedef typename Protocol::endpoint endpoint_type; // The native type of a socket. typedef socket_type native_type; // The implementation type of the socket. class implementation_type : private boost::asio::detail::noncopyable { public: // Default constructor. implementation_type() : socket_(invalid_socket), flags_(0), protocol_(endpoint_type().protocol()) { } private: // Only this service will have access to the internal values. friend class reactive_socket_service<Protocol, Reactor>; // The native socket representation. socket_type socket_; enum { // The user wants a non-blocking socket. user_set_non_blocking = 1, // The implementation wants a non-blocking socket (in order to be able to // perform asynchronous read and write operations). internal_non_blocking = 2, // Helper "flag" used to determine whether the socket is non-blocking. non_blocking = user_set_non_blocking | internal_non_blocking, // User wants connection_aborted errors, which are disabled by default. enable_connection_aborted = 4, // The user set the linger option. Needs to be checked when closing. user_set_linger = 8 }; // Flags indicating the current state of the socket. unsigned char flags_; // The protocol associated with the socket. protocol_type protocol_; // Per-descriptor data used by the reactor. typename Reactor::per_descriptor_data reactor_data_; }; // The maximum number of buffers to support in a single operation. enum { max_buffers = 64 < max_iov_len ? 64 : max_iov_len }; // Constructor. reactive_socket_service(boost::asio::io_service& io_service) : boost::asio::detail::service_base< reactive_socket_service<Protocol, Reactor> >(io_service), reactor_(boost::asio::use_service<Reactor>(io_service)) { reactor_.init_task(); } // Destroy all user-defined handler objects owned by the service. void shutdown_service() { } // Construct a new socket implementation. void construct(implementation_type& impl) { impl.socket_ = invalid_socket; impl.flags_ = 0; } // Destroy a socket implementation. void destroy(implementation_type& impl) { if (impl.socket_ != invalid_socket) { reactor_.close_descriptor(impl.socket_, impl.reactor_data_); if (impl.flags_ & implementation_type::non_blocking) { ioctl_arg_type non_blocking = 0; boost::system::error_code ignored_ec; socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, ignored_ec); impl.flags_ &= ~implementation_type::non_blocking; } if (impl.flags_ & implementation_type::user_set_linger) { ::linger opt; opt.l_onoff = 0; opt.l_linger = 0; boost::system::error_code ignored_ec; socket_ops::setsockopt(impl.socket_, SOL_SOCKET, SO_LINGER, &opt, sizeof(opt), ignored_ec); } boost::system::error_code ignored_ec; socket_ops::close(impl.socket_, ignored_ec); impl.socket_ = invalid_socket; } } // Open a new socket implementation. boost::system::error_code open(implementation_type& impl, const protocol_type& protocol, boost::system::error_code& ec) { if (is_open(impl)) { ec = boost::asio::error::already_open; return ec; } socket_holder sock(socket_ops::socket(protocol.family(), protocol.type(), protocol.protocol(), ec)); if (sock.get() == invalid_socket) return ec; if (int err = reactor_.register_descriptor(sock.get(), impl.reactor_data_)) { ec = boost::system::error_code(err, boost::asio::error::get_system_category()); return ec; } impl.socket_ = sock.release(); impl.flags_ = 0; impl.protocol_ = protocol; ec = boost::system::error_code(); return ec; } // Assign a native socket to a socket implementation. boost::system::error_code assign(implementation_type& impl, const protocol_type& protocol, const native_type& native_socket, boost::system::error_code& ec) { if (is_open(impl)) { ec = boost::asio::error::already_open; return ec; } if (int err = reactor_.register_descriptor( native_socket, impl.reactor_data_)) { ec = boost::system::error_code(err, boost::asio::error::get_system_category()); return ec; } impl.socket_ = native_socket; impl.flags_ = 0; impl.protocol_ = protocol; ec = boost::system::error_code(); return ec; } // Determine whether the socket is open. bool is_open(const implementation_type& impl) const { return impl.socket_ != invalid_socket; } // Destroy a socket implementation. boost::system::error_code close(implementation_type& impl, boost::system::error_code& ec) { if (is_open(impl)) { reactor_.close_descriptor(impl.socket_, impl.reactor_data_); if (impl.flags_ & implementation_type::non_blocking) { ioctl_arg_type non_blocking = 0; boost::system::error_code ignored_ec; socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, ignored_ec); impl.flags_ &= ~implementation_type::non_blocking; } if (socket_ops::close(impl.socket_, ec) == socket_error_retval) return ec; impl.socket_ = invalid_socket; } ec = boost::system::error_code(); return ec; } // Get the native socket representation. native_type native(implementation_type& impl) { return impl.socket_; } // Cancel all operations associated with the socket. boost::system::error_code cancel(implementation_type& impl, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return ec; } reactor_.cancel_ops(impl.socket_, impl.reactor_data_); ec = boost::system::error_code(); return ec; } // Determine whether the socket is at the out-of-band data mark. bool at_mark(const implementation_type& impl, boost::system::error_code& ec) const { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return false; } boost::asio::detail::ioctl_arg_type value = 0; socket_ops::ioctl(impl.socket_, SIOCATMARK, &value, ec); #if defined(ENOTTY) if (ec.value() == ENOTTY) ec = boost::asio::error::not_socket; #endif // defined(ENOTTY) return ec ? false : value != 0; } // Determine the number of bytes available for reading. std::size_t available(const implementation_type& impl, boost::system::error_code& ec) const { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return 0; } boost::asio::detail::ioctl_arg_type value = 0; socket_ops::ioctl(impl.socket_, FIONREAD, &value, ec); #if defined(ENOTTY) if (ec.value() == ENOTTY) ec = boost::asio::error::not_socket; #endif // defined(ENOTTY) return ec ? static_cast<std::size_t>(0) : static_cast<std::size_t>(value); } // Bind the socket to the specified local endpoint. boost::system::error_code bind(implementation_type& impl, const endpoint_type& endpoint, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return ec; } socket_ops::bind(impl.socket_, endpoint.data(), endpoint.size(), ec); return ec; } // Place the socket into the state where it will listen for new connections. boost::system::error_code listen(implementation_type& impl, int backlog, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return ec; } socket_ops::listen(impl.socket_, backlog, ec); return ec; } // Set a socket option. template <typename Option> boost::system::error_code set_option(implementation_type& impl, const Option& option, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return ec; } if (option.level(impl.protocol_) == custom_socket_option_level && option.name(impl.protocol_) == enable_connection_aborted_option) { if (option.size(impl.protocol_) != sizeof(int)) { ec = boost::asio::error::invalid_argument; } else { if (*reinterpret_cast<const int*>(option.data(impl.protocol_))) impl.flags_ |= implementation_type::enable_connection_aborted; else impl.flags_ &= ~implementation_type::enable_connection_aborted; ec = boost::system::error_code(); } return ec; } else { if (option.level(impl.protocol_) == SOL_SOCKET && option.name(impl.protocol_) == SO_LINGER) { impl.flags_ |= implementation_type::user_set_linger; } socket_ops::setsockopt(impl.socket_, option.level(impl.protocol_), option.name(impl.protocol_), option.data(impl.protocol_), option.size(impl.protocol_), ec); #if defined(__MACH__) && defined(__APPLE__) \ || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__) // To implement portable behaviour for SO_REUSEADDR with UDP sockets we // need to also set SO_REUSEPORT on BSD-based platforms. if (!ec && impl.protocol_.type() == SOCK_DGRAM && option.level(impl.protocol_) == SOL_SOCKET && option.name(impl.protocol_) == SO_REUSEADDR) { boost::system::error_code ignored_ec; socket_ops::setsockopt(impl.socket_, SOL_SOCKET, SO_REUSEPORT, option.data(impl.protocol_), option.size(impl.protocol_), ignored_ec); } #endif return ec; } } // Set a socket option. template <typename Option> boost::system::error_code get_option(const implementation_type& impl, Option& option, boost::system::error_code& ec) const { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return ec; } if (option.level(impl.protocol_) == custom_socket_option_level && option.name(impl.protocol_) == enable_connection_aborted_option) { if (option.size(impl.protocol_) != sizeof(int)) { ec = boost::asio::error::invalid_argument; } else { int* target = reinterpret_cast<int*>(option.data(impl.protocol_)); if (impl.flags_ & implementation_type::enable_connection_aborted) *target = 1; else *target = 0; option.resize(impl.protocol_, sizeof(int)); ec = boost::system::error_code(); } return ec; } else { size_t size = option.size(impl.protocol_); socket_ops::getsockopt(impl.socket_, option.level(impl.protocol_), option.name(impl.protocol_), option.data(impl.protocol_), &size, ec); if (!ec) option.resize(impl.protocol_, size); return ec; } } // Perform an IO control command on the socket. template <typename IO_Control_Command> boost::system::error_code io_control(implementation_type& impl, IO_Control_Command& command, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return ec; } if (command.name() == static_cast<int>(FIONBIO)) { // Flags are manipulated in a temporary variable so that the socket // implementation is not updated unless the ioctl operation succeeds. unsigned char new_flags = impl.flags_; if (*static_cast<ioctl_arg_type*>(command.data())) new_flags |= implementation_type::user_set_non_blocking; else new_flags &= ~implementation_type::user_set_non_blocking; // Perform ioctl on socket if the non-blocking state has changed. if (!(impl.flags_ & implementation_type::non_blocking) && (new_flags & implementation_type::non_blocking)) { ioctl_arg_type non_blocking = 1; socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, ec); } else if ((impl.flags_ & implementation_type::non_blocking) && !(new_flags & implementation_type::non_blocking)) { ioctl_arg_type non_blocking = 0; socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, ec); } else { ec = boost::system::error_code(); } // Update socket implementation's flags only if successful. if (!ec) impl.flags_ = new_flags; } else { socket_ops::ioctl(impl.socket_, command.name(), static_cast<ioctl_arg_type*>(command.data()), ec); } return ec; } // Get the local endpoint. endpoint_type local_endpoint(const implementation_type& impl, boost::system::error_code& ec) const { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return endpoint_type(); } endpoint_type endpoint; std::size_t addr_len = endpoint.capacity(); if (socket_ops::getsockname(impl.socket_, endpoint.data(), &addr_len, ec)) return endpoint_type(); endpoint.resize(addr_len); return endpoint; } // Get the remote endpoint. endpoint_type remote_endpoint(const implementation_type& impl, boost::system::error_code& ec) const { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return endpoint_type(); } endpoint_type endpoint; std::size_t addr_len = endpoint.capacity(); if (socket_ops::getpeername(impl.socket_, endpoint.data(), &addr_len, ec)) return endpoint_type(); endpoint.resize(addr_len); return endpoint; } /// Disable sends or receives on the socket. boost::system::error_code shutdown(implementation_type& impl, socket_base::shutdown_type what, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return ec; } socket_ops::shutdown(impl.socket_, what, ec); return ec; } // Send the given data to the peer. template <typename ConstBufferSequence> size_t send(implementation_type& impl, const ConstBufferSequence& buffers, socket_base::message_flags flags, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return 0; } // Copy buffers into array. socket_ops::buf bufs[max_buffers]; typename ConstBufferSequence::const_iterator iter = buffers.begin(); typename ConstBufferSequence::const_iterator end = buffers.end(); size_t i = 0; size_t total_buffer_size = 0; for (; iter != end && i < max_buffers; ++iter, ++i) { boost::asio::const_buffer buffer(*iter); socket_ops::init_buf(bufs[i], boost::asio::buffer_cast<const void*>(buffer), boost::asio::buffer_size(buffer)); total_buffer_size += boost::asio::buffer_size(buffer); } // A request to receive 0 bytes on a stream socket is a no-op. if (impl.protocol_.type() == SOCK_STREAM && total_buffer_size == 0) { ec = boost::system::error_code(); return 0; } // Send the data. for (;;) { // Try to complete the operation without blocking. int bytes_sent = socket_ops::send(impl.socket_, bufs, i, flags, ec); // Check if operation succeeded. if (bytes_sent >= 0) return bytes_sent; // Operation failed. if ((impl.flags_ & implementation_type::user_set_non_blocking) || (ec != boost::asio::error::would_block && ec != boost::asio::error::try_again)) return 0; // Wait for socket to become ready. if (socket_ops::poll_write(impl.socket_, ec) < 0) return 0; } } // Wait until data can be sent without blocking. size_t send(implementation_type& impl, const null_buffers&, socket_base::message_flags, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return 0; } // Wait for socket to become ready. socket_ops::poll_write(impl.socket_, ec); return 0; } template <typename ConstBufferSequence, typename Handler> class send_operation : public handler_base_from_member<Handler> { public: send_operation(socket_type socket, boost::asio::io_service& io_service, const ConstBufferSequence& buffers, socket_base::message_flags flags, Handler handler) : handler_base_from_member<Handler>(handler), socket_(socket), io_service_(io_service), work_(io_service), buffers_(buffers), flags_(flags) { } bool perform(boost::system::error_code& ec, std::size_t& bytes_transferred) { // Check whether the operation was successful. if (ec) { bytes_transferred = 0; return true; } // Copy buffers into array. socket_ops::buf bufs[max_buffers]; typename ConstBufferSequence::const_iterator iter = buffers_.begin(); typename ConstBufferSequence::const_iterator end = buffers_.end(); size_t i = 0; for (; iter != end && i < max_buffers; ++iter, ++i) { boost::asio::const_buffer buffer(*iter); socket_ops::init_buf(bufs[i], boost::asio::buffer_cast<const void*>(buffer), boost::asio::buffer_size(buffer)); } // Send the data. int bytes = socket_ops::send(socket_, bufs, i, flags_, ec); // Check if we need to run the operation again. if (ec == boost::asio::error::would_block || ec == boost::asio::error::try_again) return false; bytes_transferred = (bytes < 0 ? 0 : bytes); return true; } void complete(const boost::system::error_code& ec, std::size_t bytes_transferred) { io_service_.post(bind_handler(this->handler_, ec, bytes_transferred)); } private: socket_type socket_; boost::asio::io_service& io_service_; boost::asio::io_service::work work_; ConstBufferSequence buffers_; socket_base::message_flags flags_; }; // Start an asynchronous send. The data being sent must be valid for the // lifetime of the asynchronous operation. template <typename ConstBufferSequence, typename Handler> void async_send(implementation_type& impl, const ConstBufferSequence& buffers, socket_base::message_flags flags, Handler handler) { if (!is_open(impl)) { this->get_io_service().post(bind_handler(handler, boost::asio::error::bad_descriptor, 0)); } else { if (impl.protocol_.type() == SOCK_STREAM) { // Determine total size of buffers. typename ConstBufferSequence::const_iterator iter = buffers.begin(); typename ConstBufferSequence::const_iterator end = buffers.end(); size_t i = 0; size_t total_buffer_size = 0; for (; iter != end && i < max_buffers; ++iter, ++i) { boost::asio::const_buffer buffer(*iter); total_buffer_size += boost::asio::buffer_size(buffer); } // A request to receive 0 bytes on a stream socket is a no-op. if (total_buffer_size == 0) { this->get_io_service().post(bind_handler(handler, boost::system::error_code(), 0)); return; } } // Make socket non-blocking. if (!(impl.flags_ & implementation_type::internal_non_blocking)) { if (!(impl.flags_ & implementation_type::non_blocking)) { ioctl_arg_type non_blocking = 1; boost::system::error_code ec; if (socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, ec)) { this->get_io_service().post(bind_handler(handler, ec, 0)); return; } } impl.flags_ |= implementation_type::internal_non_blocking; } reactor_.start_write_op(impl.socket_, impl.reactor_data_, send_operation<ConstBufferSequence, Handler>( impl.socket_, this->get_io_service(), buffers, flags, handler)); } } template <typename Handler> class null_buffers_operation : public handler_base_from_member<Handler> { public: null_buffers_operation(boost::asio::io_service& io_service, Handler handler) : handler_base_from_member<Handler>(handler), work_(io_service) { } bool perform(boost::system::error_code&, std::size_t& bytes_transferred) { bytes_transferred = 0; return true; } void complete(const boost::system::error_code& ec, std::size_t bytes_transferred) { work_.get_io_service().post(bind_handler( this->handler_, ec, bytes_transferred)); } private: boost::asio::io_service::work work_; }; // Start an asynchronous wait until data can be sent without blocking. template <typename Handler> void async_send(implementation_type& impl, const null_buffers&, socket_base::message_flags, Handler handler) { if (!is_open(impl)) { this->get_io_service().post(bind_handler(handler, boost::asio::error::bad_descriptor, 0)); } else { reactor_.start_write_op(impl.socket_, impl.reactor_data_, null_buffers_operation<Handler>(this->get_io_service(), handler), false); } } // Send a datagram to the specified endpoint. Returns the number of bytes // sent. template <typename ConstBufferSequence> size_t send_to(implementation_type& impl, const ConstBufferSequence& buffers, const endpoint_type& destination, socket_base::message_flags flags, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return 0; } // Copy buffers into array. socket_ops::buf bufs[max_buffers]; typename ConstBufferSequence::const_iterator iter = buffers.begin(); typename ConstBufferSequence::const_iterator end = buffers.end(); size_t i = 0; for (; iter != end && i < max_buffers; ++iter, ++i) { boost::asio::const_buffer buffer(*iter); socket_ops::init_buf(bufs[i], boost::asio::buffer_cast<const void*>(buffer), boost::asio::buffer_size(buffer)); } // Send the data. for (;;) { // Try to complete the operation without blocking. int bytes_sent = socket_ops::sendto(impl.socket_, bufs, i, flags, destination.data(), destination.size(), ec); // Check if operation succeeded. if (bytes_sent >= 0) return bytes_sent; // Operation failed. if ((impl.flags_ & implementation_type::user_set_non_blocking) || (ec != boost::asio::error::would_block && ec != boost::asio::error::try_again)) return 0; // Wait for socket to become ready. if (socket_ops::poll_write(impl.socket_, ec) < 0) return 0; } } // Wait until data can be sent without blocking. size_t send_to(implementation_type& impl, const null_buffers&, socket_base::message_flags, const endpoint_type&, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return 0; } // Wait for socket to become ready. socket_ops::poll_write(impl.socket_, ec); return 0; } template <typename ConstBufferSequence, typename Handler> class send_to_operation : public handler_base_from_member<Handler> { public: send_to_operation(socket_type socket, boost::asio::io_service& io_service, const ConstBufferSequence& buffers, const endpoint_type& endpoint, socket_base::message_flags flags, Handler handler) : handler_base_from_member<Handler>(handler), socket_(socket), io_service_(io_service), work_(io_service), buffers_(buffers), destination_(endpoint), flags_(flags) { } bool perform(boost::system::error_code& ec, std::size_t& bytes_transferred) { // Check whether the operation was successful. if (ec) { bytes_transferred = 0; return true; } // Copy buffers into array. socket_ops::buf bufs[max_buffers]; typename ConstBufferSequence::const_iterator iter = buffers_.begin(); typename ConstBufferSequence::const_iterator end = buffers_.end(); size_t i = 0; for (; iter != end && i < max_buffers; ++iter, ++i) { boost::asio::const_buffer buffer(*iter); socket_ops::init_buf(bufs[i], boost::asio::buffer_cast<const void*>(buffer), boost::asio::buffer_size(buffer)); } // Send the data. int bytes = socket_ops::sendto(socket_, bufs, i, flags_, destination_.data(), destination_.size(), ec); // Check if we need to run the operation again. if (ec == boost::asio::error::would_block || ec == boost::asio::error::try_again) return false; bytes_transferred = (bytes < 0 ? 0 : bytes); return true; } void complete(const boost::system::error_code& ec, std::size_t bytes_transferred) { io_service_.post(bind_handler(this->handler_, ec, bytes_transferred)); } private: socket_type socket_; boost::asio::io_service& io_service_; boost::asio::io_service::work work_; ConstBufferSequence buffers_; endpoint_type destination_; socket_base::message_flags flags_; }; // Start an asynchronous send. The data being sent must be valid for the // lifetime of the asynchronous operation. template <typename ConstBufferSequence, typename Handler> void async_send_to(implementation_type& impl, const ConstBufferSequence& buffers, const endpoint_type& destination, socket_base::message_flags flags, Handler handler) { if (!is_open(impl)) { this->get_io_service().post(bind_handler(handler, boost::asio::error::bad_descriptor, 0)); } else { // Make socket non-blocking. if (!(impl.flags_ & implementation_type::internal_non_blocking)) { if (!(impl.flags_ & implementation_type::non_blocking)) { ioctl_arg_type non_blocking = 1; boost::system::error_code ec; if (socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, ec)) { this->get_io_service().post(bind_handler(handler, ec, 0)); return; } } impl.flags_ |= implementation_type::internal_non_blocking; } reactor_.start_write_op(impl.socket_, impl.reactor_data_, send_to_operation<ConstBufferSequence, Handler>( impl.socket_, this->get_io_service(), buffers, destination, flags, handler)); } } // Start an asynchronous wait until data can be sent without blocking. template <typename Handler> void async_send_to(implementation_type& impl, const null_buffers&, socket_base::message_flags, const endpoint_type&, Handler handler) { if (!is_open(impl)) { this->get_io_service().post(bind_handler(handler, boost::asio::error::bad_descriptor, 0)); } else { reactor_.start_write_op(impl.socket_, impl.reactor_data_, null_buffers_operation<Handler>(this->get_io_service(), handler), false); } } // Receive some data from the peer. Returns the number of bytes received. template <typename MutableBufferSequence> size_t receive(implementation_type& impl, const MutableBufferSequence& buffers, socket_base::message_flags flags, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return 0; } // Copy buffers into array. socket_ops::buf bufs[max_buffers]; typename MutableBufferSequence::const_iterator iter = buffers.begin(); typename MutableBufferSequence::const_iterator end = buffers.end(); size_t i = 0; size_t total_buffer_size = 0; for (; iter != end && i < max_buffers; ++iter, ++i) { boost::asio::mutable_buffer buffer(*iter); socket_ops::init_buf(bufs[i], boost::asio::buffer_cast<void*>(buffer), boost::asio::buffer_size(buffer)); total_buffer_size += boost::asio::buffer_size(buffer); } // A request to receive 0 bytes on a stream socket is a no-op. if (impl.protocol_.type() == SOCK_STREAM && total_buffer_size == 0) { ec = boost::system::error_code(); return 0; } // Receive some data. for (;;) { // Try to complete the operation without blocking. int bytes_recvd = socket_ops::recv(impl.socket_, bufs, i, flags, ec); // Check if operation succeeded. if (bytes_recvd > 0) return bytes_recvd; // Check for EOF. if (bytes_recvd == 0 && impl.protocol_.type() == SOCK_STREAM) { ec = boost::asio::error::eof; return 0; } // Operation failed. if ((impl.flags_ & implementation_type::user_set_non_blocking) || (ec != boost::asio::error::would_block && ec != boost::asio::error::try_again)) return 0; // Wait for socket to become ready. if (socket_ops::poll_read(impl.socket_, ec) < 0) return 0; } } // Wait until data can be received without blocking. size_t receive(implementation_type& impl, const null_buffers&, socket_base::message_flags, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return 0; } // Wait for socket to become ready. socket_ops::poll_read(impl.socket_, ec); return 0; } template <typename MutableBufferSequence, typename Handler> class receive_operation : public handler_base_from_member<Handler> { public: receive_operation(socket_type socket, int protocol_type, boost::asio::io_service& io_service, const MutableBufferSequence& buffers, socket_base::message_flags flags, Handler handler) : handler_base_from_member<Handler>(handler), socket_(socket), protocol_type_(protocol_type), io_service_(io_service), work_(io_service), buffers_(buffers), flags_(flags) { } bool perform(boost::system::error_code& ec, std::size_t& bytes_transferred) { // Check whether the operation was successful. if (ec) { bytes_transferred = 0; return true; } // Copy buffers into array. socket_ops::buf bufs[max_buffers]; typename MutableBufferSequence::const_iterator iter = buffers_.begin(); typename MutableBufferSequence::const_iterator end = buffers_.end(); size_t i = 0; for (; iter != end && i < max_buffers; ++iter, ++i) { boost::asio::mutable_buffer buffer(*iter); socket_ops::init_buf(bufs[i], boost::asio::buffer_cast<void*>(buffer), boost::asio::buffer_size(buffer)); } // Receive some data. int bytes = socket_ops::recv(socket_, bufs, i, flags_, ec); if (bytes == 0 && protocol_type_ == SOCK_STREAM) ec = boost::asio::error::eof; // Check if we need to run the operation again. if (ec == boost::asio::error::would_block || ec == boost::asio::error::try_again) return false; bytes_transferred = (bytes < 0 ? 0 : bytes); return true; } void complete(const boost::system::error_code& ec, std::size_t bytes_transferred) { io_service_.post(bind_handler(this->handler_, ec, bytes_transferred)); } private: socket_type socket_; int protocol_type_; boost::asio::io_service& io_service_; boost::asio::io_service::work work_; MutableBufferSequence buffers_; socket_base::message_flags flags_; }; // Start an asynchronous receive. The buffer for the data being received // must be valid for the lifetime of the asynchronous operation. template <typename MutableBufferSequence, typename Handler> void async_receive(implementation_type& impl, const MutableBufferSequence& buffers, socket_base::message_flags flags, Handler handler) { if (!is_open(impl)) { this->get_io_service().post(bind_handler(handler, boost::asio::error::bad_descriptor, 0)); } else { if (impl.protocol_.type() == SOCK_STREAM) { // Determine total size of buffers. typename MutableBufferSequence::const_iterator iter = buffers.begin(); typename MutableBufferSequence::const_iterator end = buffers.end(); size_t i = 0; size_t total_buffer_size = 0; for (; iter != end && i < max_buffers; ++iter, ++i) { boost::asio::mutable_buffer buffer(*iter); total_buffer_size += boost::asio::buffer_size(buffer); } // A request to receive 0 bytes on a stream socket is a no-op. if (total_buffer_size == 0) { this->get_io_service().post(bind_handler(handler, boost::system::error_code(), 0)); return; } } // Make socket non-blocking. if (!(impl.flags_ & implementation_type::internal_non_blocking)) { if (!(impl.flags_ & implementation_type::non_blocking)) { ioctl_arg_type non_blocking = 1; boost::system::error_code ec; if (socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, ec)) { this->get_io_service().post(bind_handler(handler, ec, 0)); return; } } impl.flags_ |= implementation_type::internal_non_blocking; } if (flags & socket_base::message_out_of_band) { reactor_.start_except_op(impl.socket_, impl.reactor_data_, receive_operation<MutableBufferSequence, Handler>( impl.socket_, impl.protocol_.type(), this->get_io_service(), buffers, flags, handler)); } else { reactor_.start_read_op(impl.socket_, impl.reactor_data_, receive_operation<MutableBufferSequence, Handler>( impl.socket_, impl.protocol_.type(), this->get_io_service(), buffers, flags, handler)); } } } // Wait until data can be received without blocking. template <typename Handler> void async_receive(implementation_type& impl, const null_buffers&, socket_base::message_flags flags, Handler handler) { if (!is_open(impl)) { this->get_io_service().post(bind_handler(handler, boost::asio::error::bad_descriptor, 0)); } else if (flags & socket_base::message_out_of_band) { reactor_.start_except_op(impl.socket_, impl.reactor_data_, null_buffers_operation<Handler>(this->get_io_service(), handler)); } else { reactor_.start_read_op(impl.socket_, impl.reactor_data_, null_buffers_operation<Handler>(this->get_io_service(), handler), false); } } // Receive a datagram with the endpoint of the sender. Returns the number of // bytes received. template <typename MutableBufferSequence> size_t receive_from(implementation_type& impl, const MutableBufferSequence& buffers, endpoint_type& sender_endpoint, socket_base::message_flags flags, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return 0; } // Copy buffers into array. socket_ops::buf bufs[max_buffers]; typename MutableBufferSequence::const_iterator iter = buffers.begin(); typename MutableBufferSequence::const_iterator end = buffers.end(); size_t i = 0; for (; iter != end && i < max_buffers; ++iter, ++i) { boost::asio::mutable_buffer buffer(*iter); socket_ops::init_buf(bufs[i], boost::asio::buffer_cast<void*>(buffer), boost::asio::buffer_size(buffer)); } // Receive some data. for (;;) { // Try to complete the operation without blocking. std::size_t addr_len = sender_endpoint.capacity(); int bytes_recvd = socket_ops::recvfrom(impl.socket_, bufs, i, flags, sender_endpoint.data(), &addr_len, ec); // Check if operation succeeded. if (bytes_recvd > 0) { sender_endpoint.resize(addr_len); return bytes_recvd; } // Check for EOF. if (bytes_recvd == 0 && impl.protocol_.type() == SOCK_STREAM) { ec = boost::asio::error::eof; return 0; } // Operation failed. if ((impl.flags_ & implementation_type::user_set_non_blocking) || (ec != boost::asio::error::would_block && ec != boost::asio::error::try_again)) return 0; // Wait for socket to become ready. if (socket_ops::poll_read(impl.socket_, ec) < 0) return 0; } } // Wait until data can be received without blocking. size_t receive_from(implementation_type& impl, const null_buffers&, endpoint_type& sender_endpoint, socket_base::message_flags, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return 0; } // Wait for socket to become ready. socket_ops::poll_read(impl.socket_, ec); // Reset endpoint since it can be given no sensible value at this time. sender_endpoint = endpoint_type(); return 0; } template <typename MutableBufferSequence, typename Handler> class receive_from_operation : public handler_base_from_member<Handler> { public: receive_from_operation(socket_type socket, int protocol_type, boost::asio::io_service& io_service, const MutableBufferSequence& buffers, endpoint_type& endpoint, socket_base::message_flags flags, Handler handler) : handler_base_from_member<Handler>(handler), socket_(socket), protocol_type_(protocol_type), io_service_(io_service), work_(io_service), buffers_(buffers), sender_endpoint_(endpoint), flags_(flags) { } bool perform(boost::system::error_code& ec, std::size_t& bytes_transferred) { // Check whether the operation was successful. if (ec) { bytes_transferred = 0; return true; } // Copy buffers into array. socket_ops::buf bufs[max_buffers]; typename MutableBufferSequence::const_iterator iter = buffers_.begin(); typename MutableBufferSequence::const_iterator end = buffers_.end(); size_t i = 0; for (; iter != end && i < max_buffers; ++iter, ++i) { boost::asio::mutable_buffer buffer(*iter); socket_ops::init_buf(bufs[i], boost::asio::buffer_cast<void*>(buffer), boost::asio::buffer_size(buffer)); } // Receive some data. std::size_t addr_len = sender_endpoint_.capacity(); int bytes = socket_ops::recvfrom(socket_, bufs, i, flags_, sender_endpoint_.data(), &addr_len, ec); if (bytes == 0 && protocol_type_ == SOCK_STREAM) ec = boost::asio::error::eof; // Check if we need to run the operation again. if (ec == boost::asio::error::would_block || ec == boost::asio::error::try_again) return false; sender_endpoint_.resize(addr_len); bytes_transferred = (bytes < 0 ? 0 : bytes); return true; } void complete(const boost::system::error_code& ec, std::size_t bytes_transferred) { io_service_.post(bind_handler(this->handler_, ec, bytes_transferred)); } private: socket_type socket_; int protocol_type_; boost::asio::io_service& io_service_; boost::asio::io_service::work work_; MutableBufferSequence buffers_; endpoint_type& sender_endpoint_; socket_base::message_flags flags_; }; // Start an asynchronous receive. The buffer for the data being received and // the sender_endpoint object must both be valid for the lifetime of the // asynchronous operation. template <typename MutableBufferSequence, typename Handler> void async_receive_from(implementation_type& impl, const MutableBufferSequence& buffers, endpoint_type& sender_endpoint, socket_base::message_flags flags, Handler handler) { if (!is_open(impl)) { this->get_io_service().post(bind_handler(handler, boost::asio::error::bad_descriptor, 0)); } else { // Make socket non-blocking. if (!(impl.flags_ & implementation_type::internal_non_blocking)) { if (!(impl.flags_ & implementation_type::non_blocking)) { ioctl_arg_type non_blocking = 1; boost::system::error_code ec; if (socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, ec)) { this->get_io_service().post(bind_handler(handler, ec, 0)); return; } } impl.flags_ |= implementation_type::internal_non_blocking; } reactor_.start_read_op(impl.socket_, impl.reactor_data_, receive_from_operation<MutableBufferSequence, Handler>( impl.socket_, impl.protocol_.type(), this->get_io_service(), buffers, sender_endpoint, flags, handler)); } } // Wait until data can be received without blocking. template <typename Handler> void async_receive_from(implementation_type& impl, const null_buffers&, endpoint_type& sender_endpoint, socket_base::message_flags flags, Handler handler) { if (!is_open(impl)) { this->get_io_service().post(bind_handler(handler, boost::asio::error::bad_descriptor, 0)); } else { // Reset endpoint since it can be given no sensible value at this time. sender_endpoint = endpoint_type(); if (flags & socket_base::message_out_of_band) { reactor_.start_except_op(impl.socket_, impl.reactor_data_, null_buffers_operation<Handler>(this->get_io_service(), handler)); } else { reactor_.start_read_op(impl.socket_, impl.reactor_data_, null_buffers_operation<Handler>(this->get_io_service(), handler), false); } } } // Accept a new connection. template <typename Socket> boost::system::error_code accept(implementation_type& impl, Socket& peer, endpoint_type* peer_endpoint, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return ec; } // We cannot accept a socket that is already open. if (peer.is_open()) { ec = boost::asio::error::already_open; return ec; } // Accept a socket. for (;;) { // Try to complete the operation without blocking. boost::system::error_code ec; socket_holder new_socket; std::size_t addr_len = 0; if (peer_endpoint) { addr_len = peer_endpoint->capacity(); new_socket.reset(socket_ops::accept(impl.socket_, peer_endpoint->data(), &addr_len, ec)); } else { new_socket.reset(socket_ops::accept(impl.socket_, 0, 0, ec)); } // Check if operation succeeded. if (new_socket.get() >= 0) { if (peer_endpoint) peer_endpoint->resize(addr_len); peer.assign(impl.protocol_, new_socket.get(), ec); if (!ec) new_socket.release(); return ec; } // Operation failed. if (ec == boost::asio::error::would_block || ec == boost::asio::error::try_again) { if (impl.flags_ & implementation_type::user_set_non_blocking) return ec; // Fall through to retry operation. } else if (ec == boost::asio::error::connection_aborted) { if (impl.flags_ & implementation_type::enable_connection_aborted) return ec; // Fall through to retry operation. } #if defined(EPROTO) else if (ec.value() == EPROTO) { if (impl.flags_ & implementation_type::enable_connection_aborted) return ec; // Fall through to retry operation. } #endif // defined(EPROTO) else return ec; // Wait for socket to become ready. if (socket_ops::poll_read(impl.socket_, ec) < 0) return ec; } } template <typename Socket, typename Handler> class accept_operation : public handler_base_from_member<Handler> { public: accept_operation(socket_type socket, boost::asio::io_service& io_service, Socket& peer, const protocol_type& protocol, endpoint_type* peer_endpoint, bool enable_connection_aborted, Handler handler) : handler_base_from_member<Handler>(handler), socket_(socket), io_service_(io_service), work_(io_service), peer_(peer), protocol_(protocol), peer_endpoint_(peer_endpoint), enable_connection_aborted_(enable_connection_aborted) { } bool perform(boost::system::error_code& ec, std::size_t&) { // Check whether the operation was successful. if (ec) return true; // Accept the waiting connection. socket_holder new_socket; std::size_t addr_len = 0; if (peer_endpoint_) { addr_len = peer_endpoint_->capacity(); new_socket.reset(socket_ops::accept(socket_, peer_endpoint_->data(), &addr_len, ec)); } else { new_socket.reset(socket_ops::accept(socket_, 0, 0, ec)); } // Check if we need to run the operation again. if (ec == boost::asio::error::would_block || ec == boost::asio::error::try_again) return false; if (ec == boost::asio::error::connection_aborted && !enable_connection_aborted_) return false; #if defined(EPROTO) if (ec.value() == EPROTO && !enable_connection_aborted_) return false; #endif // defined(EPROTO) // Transfer ownership of the new socket to the peer object. if (!ec) { if (peer_endpoint_) peer_endpoint_->resize(addr_len); peer_.assign(protocol_, new_socket.get(), ec); if (!ec) new_socket.release(); } return true; } void complete(const boost::system::error_code& ec, std::size_t) { io_service_.post(bind_handler(this->handler_, ec)); } private: socket_type socket_; boost::asio::io_service& io_service_; boost::asio::io_service::work work_; Socket& peer_; protocol_type protocol_; endpoint_type* peer_endpoint_; bool enable_connection_aborted_; }; // Start an asynchronous accept. The peer and peer_endpoint objects // must be valid until the accept's handler is invoked. template <typename Socket, typename Handler> void async_accept(implementation_type& impl, Socket& peer, endpoint_type* peer_endpoint, Handler handler) { if (!is_open(impl)) { this->get_io_service().post(bind_handler(handler, boost::asio::error::bad_descriptor)); } else if (peer.is_open()) { this->get_io_service().post(bind_handler(handler, boost::asio::error::already_open)); } else { // Make socket non-blocking. if (!(impl.flags_ & implementation_type::internal_non_blocking)) { if (!(impl.flags_ & implementation_type::non_blocking)) { ioctl_arg_type non_blocking = 1; boost::system::error_code ec; if (socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, ec)) { this->get_io_service().post(bind_handler(handler, ec)); return; } } impl.flags_ |= implementation_type::internal_non_blocking; } reactor_.start_read_op(impl.socket_, impl.reactor_data_, accept_operation<Socket, Handler>( impl.socket_, this->get_io_service(), peer, impl.protocol_, peer_endpoint, (impl.flags_ & implementation_type::enable_connection_aborted) != 0, handler)); } } // Connect the socket to the specified endpoint. boost::system::error_code connect(implementation_type& impl, const endpoint_type& peer_endpoint, boost::system::error_code& ec) { if (!is_open(impl)) { ec = boost::asio::error::bad_descriptor; return ec; } // Perform the connect operation. socket_ops::connect(impl.socket_, peer_endpoint.data(), peer_endpoint.size(), ec); if (ec != boost::asio::error::in_progress && ec != boost::asio::error::would_block) { // The connect operation finished immediately. return ec; } // Wait for socket to become ready. if (socket_ops::poll_connect(impl.socket_, ec) < 0) return ec; // Get the error code from the connect operation. int connect_error = 0; size_t connect_error_len = sizeof(connect_error); if (socket_ops::getsockopt(impl.socket_, SOL_SOCKET, SO_ERROR, &connect_error, &connect_error_len, ec) == socket_error_retval) return ec; // Return the result of the connect operation. ec = boost::system::error_code(connect_error, boost::asio::error::get_system_category()); return ec; } template <typename Handler> class connect_operation : public handler_base_from_member<Handler> { public: connect_operation(socket_type socket, boost::asio::io_service& io_service, Handler handler) : handler_base_from_member<Handler>(handler), socket_(socket), io_service_(io_service), work_(io_service) { } bool perform(boost::system::error_code& ec, std::size_t&) { // Check whether the operation was successful. if (ec) return true; // Get the error code from the connect operation. int connect_error = 0; size_t connect_error_len = sizeof(connect_error); if (socket_ops::getsockopt(socket_, SOL_SOCKET, SO_ERROR, &connect_error, &connect_error_len, ec) == socket_error_retval) return true; // The connection failed so the handler will be posted with an error code. if (connect_error) { ec = boost::system::error_code(connect_error, boost::asio::error::get_system_category()); return true; } return true; } void complete(const boost::system::error_code& ec, std::size_t) { io_service_.post(bind_handler(this->handler_, ec)); } private: socket_type socket_; boost::asio::io_service& io_service_; boost::asio::io_service::work work_; }; // Start an asynchronous connect. template <typename Handler> void async_connect(implementation_type& impl, const endpoint_type& peer_endpoint, Handler handler) { if (!is_open(impl)) { this->get_io_service().post(bind_handler(handler, boost::asio::error::bad_descriptor)); return; } // Make socket non-blocking. if (!(impl.flags_ & implementation_type::internal_non_blocking)) { if (!(impl.flags_ & implementation_type::non_blocking)) { ioctl_arg_type non_blocking = 1; boost::system::error_code ec; if (socket_ops::ioctl(impl.socket_, FIONBIO, &non_blocking, ec)) { this->get_io_service().post(bind_handler(handler, ec)); return; } } impl.flags_ |= implementation_type::internal_non_blocking; } // Start the connect operation. The socket is already marked as non-blocking // so the connection will take place asynchronously. boost::system::error_code ec; if (socket_ops::connect(impl.socket_, peer_endpoint.data(), peer_endpoint.size(), ec) == 0) { // The connect operation has finished successfully so we need to post the // handler immediately. this->get_io_service().post(bind_handler(handler, boost::system::error_code())); } else if (ec == boost::asio::error::in_progress || ec == boost::asio::error::would_block) { // The connection is happening in the background, and we need to wait // until the socket becomes writeable. reactor_.start_connect_op(impl.socket_, impl.reactor_data_, connect_operation<Handler>(impl.socket_, this->get_io_service(), handler)); } else { // The connect operation has failed, so post the handler immediately. this->get_io_service().post(bind_handler(handler, ec)); } } private: // The selector that performs event demultiplexing for the service. Reactor& reactor_; }; } // namespace detail } // namespace asio } // namespace boost #include <boost/asio/detail/pop_options.hpp> #endif // BOOST_ASIO_DETAIL_REACTIVE_SOCKET_SERVICE_HPP