boost/asio/basic_socket.hpp
// // basic_socket.hpp // ~~~~~~~~~~~~~~~~ // // 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 BOOST_ASIO_BASIC_SOCKET_HPP #define BOOST_ASIO_BASIC_SOCKET_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include <boost/asio/detail/config.hpp> #include <boost/asio/async_result.hpp> #include <boost/asio/basic_io_object.hpp> #include <boost/asio/detail/handler_type_requirements.hpp> #include <boost/asio/detail/throw_error.hpp> #include <boost/asio/detail/type_traits.hpp> #include <boost/asio/error.hpp> #include <boost/asio/post.hpp> #include <boost/asio/socket_base.hpp> #if defined(BOOST_ASIO_HAS_MOVE) # include <utility> #endif // defined(BOOST_ASIO_HAS_MOVE) #if !defined(BOOST_ASIO_ENABLE_OLD_SERVICES) # if defined(BOOST_ASIO_WINDOWS_RUNTIME) # include <boost/asio/detail/winrt_ssocket_service.hpp> # define BOOST_ASIO_SVC_T detail::winrt_ssocket_service<Protocol> # elif defined(BOOST_ASIO_HAS_IOCP) # include <boost/asio/detail/win_iocp_socket_service.hpp> # define BOOST_ASIO_SVC_T detail::win_iocp_socket_service<Protocol> # else # include <boost/asio/detail/reactive_socket_service.hpp> # define BOOST_ASIO_SVC_T detail::reactive_socket_service<Protocol> # endif #endif // !defined(BOOST_ASIO_ENABLE_OLD_SERVICES) #include <boost/asio/detail/push_options.hpp> namespace boost { namespace asio { /// Provides socket functionality. /** * The basic_socket class template provides functionality that is common to both * stream-oriented and datagram-oriented sockets. * * @par Thread Safety * @e Distinct @e objects: Safe.@n * @e Shared @e objects: Unsafe. */ template <typename Protocol BOOST_ASIO_SVC_TPARAM> class basic_socket : BOOST_ASIO_SVC_ACCESS basic_io_object<BOOST_ASIO_SVC_T>, public socket_base { public: /// The type of the executor associated with the object. typedef io_context::executor_type executor_type; /// The native representation of a socket. #if defined(GENERATING_DOCUMENTATION) typedef implementation_defined native_handle_type; #else typedef typename BOOST_ASIO_SVC_T::native_handle_type native_handle_type; #endif /// The protocol type. typedef Protocol protocol_type; /// The endpoint type. typedef typename Protocol::endpoint endpoint_type; #if !defined(BOOST_ASIO_NO_EXTENSIONS) /// A basic_socket is always the lowest layer. typedef basic_socket<Protocol BOOST_ASIO_SVC_TARG> lowest_layer_type; #endif // !defined(BOOST_ASIO_NO_EXTENSIONS) /// Construct a basic_socket without opening it. /** * This constructor creates a socket without opening it. * * @param io_context The io_context object that the socket will use to * dispatch handlers for any asynchronous operations performed on the socket. */ explicit basic_socket(boost::asio::io_context& io_context) : basic_io_object<BOOST_ASIO_SVC_T>(io_context) { } /// Construct and open a basic_socket. /** * This constructor creates and opens a socket. * * @param io_context The io_context object that the socket will use to * dispatch handlers for any asynchronous operations performed on the socket. * * @param protocol An object specifying protocol parameters to be used. * * @throws boost::system::system_error Thrown on failure. */ basic_socket(boost::asio::io_context& io_context, const protocol_type& protocol) : basic_io_object<BOOST_ASIO_SVC_T>(io_context) { boost::system::error_code ec; this->get_service().open(this->get_implementation(), protocol, ec); boost::asio::detail::throw_error(ec, "open"); } /// Construct a basic_socket, opening it and binding it to the given local /// endpoint. /** * This constructor creates a socket and automatically opens it bound to the * specified endpoint on the local machine. The protocol used is the protocol * associated with the given endpoint. * * @param io_context The io_context object that the socket will use to * dispatch handlers for any asynchronous operations performed on the socket. * * @param endpoint An endpoint on the local machine to which the socket will * be bound. * * @throws boost::system::system_error Thrown on failure. */ basic_socket(boost::asio::io_context& io_context, const endpoint_type& endpoint) : basic_io_object<BOOST_ASIO_SVC_T>(io_context) { boost::system::error_code ec; const protocol_type protocol = endpoint.protocol(); this->get_service().open(this->get_implementation(), protocol, ec); boost::asio::detail::throw_error(ec, "open"); this->get_service().bind(this->get_implementation(), endpoint, ec); boost::asio::detail::throw_error(ec, "bind"); } /// Construct a basic_socket on an existing native socket. /** * This constructor creates a socket object to hold an existing native socket. * * @param io_context The io_context object that the socket will use to * dispatch handlers for any asynchronous operations performed on the socket. * * @param protocol An object specifying protocol parameters to be used. * * @param native_socket A native socket. * * @throws boost::system::system_error Thrown on failure. */ basic_socket(boost::asio::io_context& io_context, const protocol_type& protocol, const native_handle_type& native_socket) : basic_io_object<BOOST_ASIO_SVC_T>(io_context) { boost::system::error_code ec; this->get_service().assign(this->get_implementation(), protocol, native_socket, ec); boost::asio::detail::throw_error(ec, "assign"); } #if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION) /// Move-construct a basic_socket from another. /** * This constructor moves a socket from one object to another. * * @param other The other basic_socket object from which the move will * occur. * * @note Following the move, the moved-from object is in the same state as if * constructed using the @c basic_socket(io_context&) constructor. */ basic_socket(basic_socket&& other) : basic_io_object<BOOST_ASIO_SVC_T>(std::move(other)) { } /// Move-assign a basic_socket from another. /** * This assignment operator moves a socket from one object to another. * * @param other The other basic_socket object from which the move will * occur. * * @note Following the move, the moved-from object is in the same state as if * constructed using the @c basic_socket(io_context&) constructor. */ basic_socket& operator=(basic_socket&& other) { basic_io_object<BOOST_ASIO_SVC_T>::operator=(std::move(other)); return *this; } // All sockets have access to each other's implementations. template <typename Protocol1 BOOST_ASIO_SVC_TPARAM1> friend class basic_socket; /// Move-construct a basic_socket from a socket of another protocol type. /** * This constructor moves a socket from one object to another. * * @param other The other basic_socket object from which the move will * occur. * * @note Following the move, the moved-from object is in the same state as if * constructed using the @c basic_socket(io_context&) constructor. */ template <typename Protocol1 BOOST_ASIO_SVC_TPARAM1> basic_socket(basic_socket<Protocol1 BOOST_ASIO_SVC_TARG1>&& other, typename enable_if<is_convertible<Protocol1, Protocol>::value>::type* = 0) : basic_io_object<BOOST_ASIO_SVC_T>( other.get_service(), other.get_implementation()) { } /// Move-assign a basic_socket from a socket of another protocol type. /** * This assignment operator moves a socket from one object to another. * * @param other The other basic_socket object from which the move will * occur. * * @note Following the move, the moved-from object is in the same state as if * constructed using the @c basic_socket(io_context&) constructor. */ template <typename Protocol1 BOOST_ASIO_SVC_TPARAM1> typename enable_if<is_convertible<Protocol1, Protocol>::value, basic_socket>::type& operator=( basic_socket<Protocol1 BOOST_ASIO_SVC_TARG1>&& other) { basic_socket tmp(std::move(other)); basic_io_object<BOOST_ASIO_SVC_T>::operator=(std::move(tmp)); return *this; } #endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION) #if defined(BOOST_ASIO_ENABLE_OLD_SERVICES) // These functions are provided by basic_io_object<>. #else // defined(BOOST_ASIO_ENABLE_OLD_SERVICES) #if !defined(BOOST_ASIO_NO_DEPRECATED) /// (Deprecated: Use get_executor().) Get the io_context associated with the /// object. /** * This function may be used to obtain the io_context object that the I/O * object uses to dispatch handlers for asynchronous operations. * * @return A reference to the io_context object that the I/O object will use * to dispatch handlers. Ownership is not transferred to the caller. */ boost::asio::io_context& get_io_context() { return basic_io_object<BOOST_ASIO_SVC_T>::get_io_context(); } /// (Deprecated: Use get_executor().) Get the io_context associated with the /// object. /** * This function may be used to obtain the io_context object that the I/O * object uses to dispatch handlers for asynchronous operations. * * @return A reference to the io_context object that the I/O object will use * to dispatch handlers. Ownership is not transferred to the caller. */ boost::asio::io_context& get_io_service() { return basic_io_object<BOOST_ASIO_SVC_T>::get_io_service(); } #endif // !defined(BOOST_ASIO_NO_DEPRECATED) /// Get the executor associated with the object. executor_type get_executor() BOOST_ASIO_NOEXCEPT { return basic_io_object<BOOST_ASIO_SVC_T>::get_executor(); } #endif // defined(BOOST_ASIO_ENABLE_OLD_SERVICES) #if !defined(BOOST_ASIO_NO_EXTENSIONS) /// Get a reference to the lowest layer. /** * This function returns a reference to the lowest layer in a stack of * layers. Since a basic_socket cannot contain any further layers, it simply * returns a reference to itself. * * @return A reference to the lowest layer in the stack of layers. Ownership * is not transferred to the caller. */ lowest_layer_type& lowest_layer() { return *this; } /// Get a const reference to the lowest layer. /** * This function returns a const reference to the lowest layer in a stack of * layers. Since a basic_socket cannot contain any further layers, it simply * returns a reference to itself. * * @return A const reference to the lowest layer in the stack of layers. * Ownership is not transferred to the caller. */ const lowest_layer_type& lowest_layer() const { return *this; } #endif // !defined(BOOST_ASIO_NO_EXTENSIONS) /// Open the socket using the specified protocol. /** * This function opens the socket so that it will use the specified protocol. * * @param protocol An object specifying protocol parameters to be used. * * @throws boost::system::system_error Thrown on failure. * * @par Example * @code * boost::asio::ip::tcp::socket socket(io_context); * socket.open(boost::asio::ip::tcp::v4()); * @endcode */ void open(const protocol_type& protocol = protocol_type()) { boost::system::error_code ec; this->get_service().open(this->get_implementation(), protocol, ec); boost::asio::detail::throw_error(ec, "open"); } /// Open the socket using the specified protocol. /** * This function opens the socket so that it will use the specified protocol. * * @param protocol An object specifying which protocol is to be used. * * @param ec Set to indicate what error occurred, if any. * * @par Example * @code * boost::asio::ip::tcp::socket socket(io_context); * boost::system::error_code ec; * socket.open(boost::asio::ip::tcp::v4(), ec); * if (ec) * { * // An error occurred. * } * @endcode */ BOOST_ASIO_SYNC_OP_VOID open(const protocol_type& protocol, boost::system::error_code& ec) { this->get_service().open(this->get_implementation(), protocol, ec); BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } /// Assign an existing native socket to the socket. /* * This function opens the socket to hold an existing native socket. * * @param protocol An object specifying which protocol is to be used. * * @param native_socket A native socket. * * @throws boost::system::system_error Thrown on failure. */ void assign(const protocol_type& protocol, const native_handle_type& native_socket) { boost::system::error_code ec; this->get_service().assign(this->get_implementation(), protocol, native_socket, ec); boost::asio::detail::throw_error(ec, "assign"); } /// Assign an existing native socket to the socket. /* * This function opens the socket to hold an existing native socket. * * @param protocol An object specifying which protocol is to be used. * * @param native_socket A native socket. * * @param ec Set to indicate what error occurred, if any. */ BOOST_ASIO_SYNC_OP_VOID assign(const protocol_type& protocol, const native_handle_type& native_socket, boost::system::error_code& ec) { this->get_service().assign(this->get_implementation(), protocol, native_socket, ec); BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } /// Determine whether the socket is open. bool is_open() const { return this->get_service().is_open(this->get_implementation()); } /// Close the socket. /** * This function is used to close the socket. Any asynchronous send, receive * or connect operations will be cancelled immediately, and will complete * with the boost::asio::error::operation_aborted error. * * @throws boost::system::system_error Thrown on failure. Note that, even if * the function indicates an error, the underlying descriptor is closed. * * @note For portable behaviour with respect to graceful closure of a * connected socket, call shutdown() before closing the socket. */ void close() { boost::system::error_code ec; this->get_service().close(this->get_implementation(), ec); boost::asio::detail::throw_error(ec, "close"); } /// Close the socket. /** * This function is used to close the socket. Any asynchronous send, receive * or connect operations will be cancelled immediately, and will complete * with the boost::asio::error::operation_aborted error. * * @param ec Set to indicate what error occurred, if any. Note that, even if * the function indicates an error, the underlying descriptor is closed. * * @par Example * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * boost::system::error_code ec; * socket.close(ec); * if (ec) * { * // An error occurred. * } * @endcode * * @note For portable behaviour with respect to graceful closure of a * connected socket, call shutdown() before closing the socket. */ BOOST_ASIO_SYNC_OP_VOID close(boost::system::error_code& ec) { this->get_service().close(this->get_implementation(), ec); BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } /// Release ownership of the underlying native socket. /** * This function causes all outstanding asynchronous connect, send and receive * operations to finish immediately, and the handlers for cancelled operations * will be passed the boost::asio::error::operation_aborted error. Ownership * of the native socket is then transferred to the caller. * * @throws boost::system::system_error Thrown on failure. * * @note This function is unsupported on Windows versions prior to Windows * 8.1, and will fail with boost::asio::error::operation_not_supported on * these platforms. */ #if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \ && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603) __declspec(deprecated("This function always fails with " "operation_not_supported when used on Windows versions " "prior to Windows 8.1.")) #endif native_handle_type release() { boost::system::error_code ec; native_handle_type s = this->get_service().release( this->get_implementation(), ec); boost::asio::detail::throw_error(ec, "release"); return s; } /// Release ownership of the underlying native socket. /** * This function causes all outstanding asynchronous connect, send and receive * operations to finish immediately, and the handlers for cancelled operations * will be passed the boost::asio::error::operation_aborted error. Ownership * of the native socket is then transferred to the caller. * * @param ec Set to indicate what error occurred, if any. * * @note This function is unsupported on Windows versions prior to Windows * 8.1, and will fail with boost::asio::error::operation_not_supported on * these platforms. */ #if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \ && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603) __declspec(deprecated("This function always fails with " "operation_not_supported when used on Windows versions " "prior to Windows 8.1.")) #endif native_handle_type release(boost::system::error_code& ec) { return this->get_service().release(this->get_implementation(), ec); } /// Get the native socket representation. /** * This function may be used to obtain the underlying representation of the * socket. This is intended to allow access to native socket functionality * that is not otherwise provided. */ native_handle_type native_handle() { return this->get_service().native_handle(this->get_implementation()); } /// Cancel all asynchronous operations associated with the socket. /** * This function causes all outstanding asynchronous connect, send and receive * operations to finish immediately, and the handlers for cancelled operations * will be passed the boost::asio::error::operation_aborted error. * * @throws boost::system::system_error Thrown on failure. * * @note Calls to cancel() will always fail with * boost::asio::error::operation_not_supported when run on Windows XP, Windows * Server 2003, and earlier versions of Windows, unless * BOOST_ASIO_ENABLE_CANCELIO is defined. However, the CancelIo function has * two issues that should be considered before enabling its use: * * @li It will only cancel asynchronous operations that were initiated in the * current thread. * * @li It can appear to complete without error, but the request to cancel the * unfinished operations may be silently ignored by the operating system. * Whether it works or not seems to depend on the drivers that are installed. * * For portable cancellation, consider using one of the following * alternatives: * * @li Disable asio's I/O completion port backend by defining * BOOST_ASIO_DISABLE_IOCP. * * @li Use the close() function to simultaneously cancel the outstanding * operations and close the socket. * * When running on Windows Vista, Windows Server 2008, and later, the * CancelIoEx function is always used. This function does not have the * problems described above. */ #if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \ && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600) \ && !defined(BOOST_ASIO_ENABLE_CANCELIO) __declspec(deprecated("By default, this function always fails with " "operation_not_supported when used on Windows XP, Windows Server 2003, " "or earlier. Consult documentation for details.")) #endif void cancel() { boost::system::error_code ec; this->get_service().cancel(this->get_implementation(), ec); boost::asio::detail::throw_error(ec, "cancel"); } /// Cancel all asynchronous operations associated with the socket. /** * This function causes all outstanding asynchronous connect, send and receive * operations to finish immediately, and the handlers for cancelled operations * will be passed the boost::asio::error::operation_aborted error. * * @param ec Set to indicate what error occurred, if any. * * @note Calls to cancel() will always fail with * boost::asio::error::operation_not_supported when run on Windows XP, Windows * Server 2003, and earlier versions of Windows, unless * BOOST_ASIO_ENABLE_CANCELIO is defined. However, the CancelIo function has * two issues that should be considered before enabling its use: * * @li It will only cancel asynchronous operations that were initiated in the * current thread. * * @li It can appear to complete without error, but the request to cancel the * unfinished operations may be silently ignored by the operating system. * Whether it works or not seems to depend on the drivers that are installed. * * For portable cancellation, consider using one of the following * alternatives: * * @li Disable asio's I/O completion port backend by defining * BOOST_ASIO_DISABLE_IOCP. * * @li Use the close() function to simultaneously cancel the outstanding * operations and close the socket. * * When running on Windows Vista, Windows Server 2008, and later, the * CancelIoEx function is always used. This function does not have the * problems described above. */ #if defined(BOOST_ASIO_MSVC) && (BOOST_ASIO_MSVC >= 1400) \ && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600) \ && !defined(BOOST_ASIO_ENABLE_CANCELIO) __declspec(deprecated("By default, this function always fails with " "operation_not_supported when used on Windows XP, Windows Server 2003, " "or earlier. Consult documentation for details.")) #endif BOOST_ASIO_SYNC_OP_VOID cancel(boost::system::error_code& ec) { this->get_service().cancel(this->get_implementation(), ec); BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } /// Determine whether the socket is at the out-of-band data mark. /** * This function is used to check whether the socket input is currently * positioned at the out-of-band data mark. * * @return A bool indicating whether the socket is at the out-of-band data * mark. * * @throws boost::system::system_error Thrown on failure. */ bool at_mark() const { boost::system::error_code ec; bool b = this->get_service().at_mark(this->get_implementation(), ec); boost::asio::detail::throw_error(ec, "at_mark"); return b; } /// Determine whether the socket is at the out-of-band data mark. /** * This function is used to check whether the socket input is currently * positioned at the out-of-band data mark. * * @param ec Set to indicate what error occurred, if any. * * @return A bool indicating whether the socket is at the out-of-band data * mark. */ bool at_mark(boost::system::error_code& ec) const { return this->get_service().at_mark(this->get_implementation(), ec); } /// Determine the number of bytes available for reading. /** * This function is used to determine the number of bytes that may be read * without blocking. * * @return The number of bytes that may be read without blocking, or 0 if an * error occurs. * * @throws boost::system::system_error Thrown on failure. */ std::size_t available() const { boost::system::error_code ec; std::size_t s = this->get_service().available( this->get_implementation(), ec); boost::asio::detail::throw_error(ec, "available"); return s; } /// Determine the number of bytes available for reading. /** * This function is used to determine the number of bytes that may be read * without blocking. * * @param ec Set to indicate what error occurred, if any. * * @return The number of bytes that may be read without blocking, or 0 if an * error occurs. */ std::size_t available(boost::system::error_code& ec) const { return this->get_service().available(this->get_implementation(), ec); } /// Bind the socket to the given local endpoint. /** * This function binds the socket to the specified endpoint on the local * machine. * * @param endpoint An endpoint on the local machine to which the socket will * be bound. * * @throws boost::system::system_error Thrown on failure. * * @par Example * @code * boost::asio::ip::tcp::socket socket(io_context); * socket.open(boost::asio::ip::tcp::v4()); * socket.bind(boost::asio::ip::tcp::endpoint( * boost::asio::ip::tcp::v4(), 12345)); * @endcode */ void bind(const endpoint_type& endpoint) { boost::system::error_code ec; this->get_service().bind(this->get_implementation(), endpoint, ec); boost::asio::detail::throw_error(ec, "bind"); } /// Bind the socket to the given local endpoint. /** * This function binds the socket to the specified endpoint on the local * machine. * * @param endpoint An endpoint on the local machine to which the socket will * be bound. * * @param ec Set to indicate what error occurred, if any. * * @par Example * @code * boost::asio::ip::tcp::socket socket(io_context); * socket.open(boost::asio::ip::tcp::v4()); * boost::system::error_code ec; * socket.bind(boost::asio::ip::tcp::endpoint( * boost::asio::ip::tcp::v4(), 12345), ec); * if (ec) * { * // An error occurred. * } * @endcode */ BOOST_ASIO_SYNC_OP_VOID bind(const endpoint_type& endpoint, boost::system::error_code& ec) { this->get_service().bind(this->get_implementation(), endpoint, ec); BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } /// Connect the socket to the specified endpoint. /** * This function is used to connect a socket to the specified remote endpoint. * The function call will block until the connection is successfully made or * an error occurs. * * The socket is automatically opened if it is not already open. If the * connect fails, and the socket was automatically opened, the socket is * not returned to the closed state. * * @param peer_endpoint The remote endpoint to which the socket will be * connected. * * @throws boost::system::system_error Thrown on failure. * * @par Example * @code * boost::asio::ip::tcp::socket socket(io_context); * boost::asio::ip::tcp::endpoint endpoint( * boost::asio::ip::address::from_string("1.2.3.4"), 12345); * socket.connect(endpoint); * @endcode */ void connect(const endpoint_type& peer_endpoint) { boost::system::error_code ec; if (!is_open()) { this->get_service().open(this->get_implementation(), peer_endpoint.protocol(), ec); boost::asio::detail::throw_error(ec, "connect"); } this->get_service().connect(this->get_implementation(), peer_endpoint, ec); boost::asio::detail::throw_error(ec, "connect"); } /// Connect the socket to the specified endpoint. /** * This function is used to connect a socket to the specified remote endpoint. * The function call will block until the connection is successfully made or * an error occurs. * * The socket is automatically opened if it is not already open. If the * connect fails, and the socket was automatically opened, the socket is * not returned to the closed state. * * @param peer_endpoint The remote endpoint to which the socket will be * connected. * * @param ec Set to indicate what error occurred, if any. * * @par Example * @code * boost::asio::ip::tcp::socket socket(io_context); * boost::asio::ip::tcp::endpoint endpoint( * boost::asio::ip::address::from_string("1.2.3.4"), 12345); * boost::system::error_code ec; * socket.connect(endpoint, ec); * if (ec) * { * // An error occurred. * } * @endcode */ BOOST_ASIO_SYNC_OP_VOID connect(const endpoint_type& peer_endpoint, boost::system::error_code& ec) { if (!is_open()) { this->get_service().open(this->get_implementation(), peer_endpoint.protocol(), ec); if (ec) { BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } } this->get_service().connect(this->get_implementation(), peer_endpoint, ec); BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } /// Start an asynchronous connect. /** * This function is used to asynchronously connect a socket to the specified * remote endpoint. The function call always returns immediately. * * The socket is automatically opened if it is not already open. If the * connect fails, and the socket was automatically opened, the socket is * not returned to the closed state. * * @param peer_endpoint The remote endpoint to which the socket will be * connected. Copies will be made of the endpoint object as required. * * @param handler The handler to be called when the connection operation * completes. Copies will be made of the handler as required. The function * signature of the handler must be: * @code void handler( * const boost::system::error_code& error // Result of operation * ); @endcode * Regardless of whether the asynchronous operation completes immediately or * not, the handler will not be invoked from within this function. Invocation * of the handler will be performed in a manner equivalent to using * boost::asio::io_context::post(). * * @par Example * @code * void connect_handler(const boost::system::error_code& error) * { * if (!error) * { * // Connect succeeded. * } * } * * ... * * boost::asio::ip::tcp::socket socket(io_context); * boost::asio::ip::tcp::endpoint endpoint( * boost::asio::ip::address::from_string("1.2.3.4"), 12345); * socket.async_connect(endpoint, connect_handler); * @endcode */ template <typename ConnectHandler> BOOST_ASIO_INITFN_RESULT_TYPE(ConnectHandler, void (boost::system::error_code)) async_connect(const endpoint_type& peer_endpoint, BOOST_ASIO_MOVE_ARG(ConnectHandler) handler) { // If you get an error on the following line it means that your handler does // not meet the documented type requirements for a ConnectHandler. BOOST_ASIO_CONNECT_HANDLER_CHECK(ConnectHandler, handler) type_check; if (!is_open()) { boost::system::error_code ec; const protocol_type protocol = peer_endpoint.protocol(); this->get_service().open(this->get_implementation(), protocol, ec); if (ec) { async_completion<ConnectHandler, void (boost::system::error_code)> init(handler); boost::asio::post(this->get_executor(), boost::asio::detail::bind_handler( BOOST_ASIO_MOVE_CAST(BOOST_ASIO_HANDLER_TYPE( ConnectHandler, void (boost::system::error_code)))( init.completion_handler), ec)); return init.result.get(); } } #if defined(BOOST_ASIO_ENABLE_OLD_SERVICES) return this->get_service().async_connect(this->get_implementation(), peer_endpoint, BOOST_ASIO_MOVE_CAST(ConnectHandler)(handler)); #else // defined(BOOST_ASIO_ENABLE_OLD_SERVICES) async_completion<ConnectHandler, void (boost::system::error_code)> init(handler); this->get_service().async_connect( this->get_implementation(), peer_endpoint, init.completion_handler); return init.result.get(); #endif // defined(BOOST_ASIO_ENABLE_OLD_SERVICES) } /// Set an option on the socket. /** * This function is used to set an option on the socket. * * @param option The new option value to be set on the socket. * * @throws boost::system::system_error Thrown on failure. * * @sa SettableSocketOption @n * boost::asio::socket_base::broadcast @n * boost::asio::socket_base::do_not_route @n * boost::asio::socket_base::keep_alive @n * boost::asio::socket_base::linger @n * boost::asio::socket_base::receive_buffer_size @n * boost::asio::socket_base::receive_low_watermark @n * boost::asio::socket_base::reuse_address @n * boost::asio::socket_base::send_buffer_size @n * boost::asio::socket_base::send_low_watermark @n * boost::asio::ip::multicast::join_group @n * boost::asio::ip::multicast::leave_group @n * boost::asio::ip::multicast::enable_loopback @n * boost::asio::ip::multicast::outbound_interface @n * boost::asio::ip::multicast::hops @n * boost::asio::ip::tcp::no_delay * * @par Example * Setting the IPPROTO_TCP/TCP_NODELAY option: * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * boost::asio::ip::tcp::no_delay option(true); * socket.set_option(option); * @endcode */ template <typename SettableSocketOption> void set_option(const SettableSocketOption& option) { boost::system::error_code ec; this->get_service().set_option(this->get_implementation(), option, ec); boost::asio::detail::throw_error(ec, "set_option"); } /// Set an option on the socket. /** * This function is used to set an option on the socket. * * @param option The new option value to be set on the socket. * * @param ec Set to indicate what error occurred, if any. * * @sa SettableSocketOption @n * boost::asio::socket_base::broadcast @n * boost::asio::socket_base::do_not_route @n * boost::asio::socket_base::keep_alive @n * boost::asio::socket_base::linger @n * boost::asio::socket_base::receive_buffer_size @n * boost::asio::socket_base::receive_low_watermark @n * boost::asio::socket_base::reuse_address @n * boost::asio::socket_base::send_buffer_size @n * boost::asio::socket_base::send_low_watermark @n * boost::asio::ip::multicast::join_group @n * boost::asio::ip::multicast::leave_group @n * boost::asio::ip::multicast::enable_loopback @n * boost::asio::ip::multicast::outbound_interface @n * boost::asio::ip::multicast::hops @n * boost::asio::ip::tcp::no_delay * * @par Example * Setting the IPPROTO_TCP/TCP_NODELAY option: * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * boost::asio::ip::tcp::no_delay option(true); * boost::system::error_code ec; * socket.set_option(option, ec); * if (ec) * { * // An error occurred. * } * @endcode */ template <typename SettableSocketOption> BOOST_ASIO_SYNC_OP_VOID set_option(const SettableSocketOption& option, boost::system::error_code& ec) { this->get_service().set_option(this->get_implementation(), option, ec); BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } /// Get an option from the socket. /** * This function is used to get the current value of an option on the socket. * * @param option The option value to be obtained from the socket. * * @throws boost::system::system_error Thrown on failure. * * @sa GettableSocketOption @n * boost::asio::socket_base::broadcast @n * boost::asio::socket_base::do_not_route @n * boost::asio::socket_base::keep_alive @n * boost::asio::socket_base::linger @n * boost::asio::socket_base::receive_buffer_size @n * boost::asio::socket_base::receive_low_watermark @n * boost::asio::socket_base::reuse_address @n * boost::asio::socket_base::send_buffer_size @n * boost::asio::socket_base::send_low_watermark @n * boost::asio::ip::multicast::join_group @n * boost::asio::ip::multicast::leave_group @n * boost::asio::ip::multicast::enable_loopback @n * boost::asio::ip::multicast::outbound_interface @n * boost::asio::ip::multicast::hops @n * boost::asio::ip::tcp::no_delay * * @par Example * Getting the value of the SOL_SOCKET/SO_KEEPALIVE option: * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * boost::asio::ip::tcp::socket::keep_alive option; * socket.get_option(option); * bool is_set = option.value(); * @endcode */ template <typename GettableSocketOption> void get_option(GettableSocketOption& option) const { boost::system::error_code ec; this->get_service().get_option(this->get_implementation(), option, ec); boost::asio::detail::throw_error(ec, "get_option"); } /// Get an option from the socket. /** * This function is used to get the current value of an option on the socket. * * @param option The option value to be obtained from the socket. * * @param ec Set to indicate what error occurred, if any. * * @sa GettableSocketOption @n * boost::asio::socket_base::broadcast @n * boost::asio::socket_base::do_not_route @n * boost::asio::socket_base::keep_alive @n * boost::asio::socket_base::linger @n * boost::asio::socket_base::receive_buffer_size @n * boost::asio::socket_base::receive_low_watermark @n * boost::asio::socket_base::reuse_address @n * boost::asio::socket_base::send_buffer_size @n * boost::asio::socket_base::send_low_watermark @n * boost::asio::ip::multicast::join_group @n * boost::asio::ip::multicast::leave_group @n * boost::asio::ip::multicast::enable_loopback @n * boost::asio::ip::multicast::outbound_interface @n * boost::asio::ip::multicast::hops @n * boost::asio::ip::tcp::no_delay * * @par Example * Getting the value of the SOL_SOCKET/SO_KEEPALIVE option: * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * boost::asio::ip::tcp::socket::keep_alive option; * boost::system::error_code ec; * socket.get_option(option, ec); * if (ec) * { * // An error occurred. * } * bool is_set = option.value(); * @endcode */ template <typename GettableSocketOption> BOOST_ASIO_SYNC_OP_VOID get_option(GettableSocketOption& option, boost::system::error_code& ec) const { this->get_service().get_option(this->get_implementation(), option, ec); BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } /// Perform an IO control command on the socket. /** * This function is used to execute an IO control command on the socket. * * @param command The IO control command to be performed on the socket. * * @throws boost::system::system_error Thrown on failure. * * @sa IoControlCommand @n * boost::asio::socket_base::bytes_readable @n * boost::asio::socket_base::non_blocking_io * * @par Example * Getting the number of bytes ready to read: * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * boost::asio::ip::tcp::socket::bytes_readable command; * socket.io_control(command); * std::size_t bytes_readable = command.get(); * @endcode */ template <typename IoControlCommand> void io_control(IoControlCommand& command) { boost::system::error_code ec; this->get_service().io_control(this->get_implementation(), command, ec); boost::asio::detail::throw_error(ec, "io_control"); } /// Perform an IO control command on the socket. /** * This function is used to execute an IO control command on the socket. * * @param command The IO control command to be performed on the socket. * * @param ec Set to indicate what error occurred, if any. * * @sa IoControlCommand @n * boost::asio::socket_base::bytes_readable @n * boost::asio::socket_base::non_blocking_io * * @par Example * Getting the number of bytes ready to read: * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * boost::asio::ip::tcp::socket::bytes_readable command; * boost::system::error_code ec; * socket.io_control(command, ec); * if (ec) * { * // An error occurred. * } * std::size_t bytes_readable = command.get(); * @endcode */ template <typename IoControlCommand> BOOST_ASIO_SYNC_OP_VOID io_control(IoControlCommand& command, boost::system::error_code& ec) { this->get_service().io_control(this->get_implementation(), command, ec); BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } /// Gets the non-blocking mode of the socket. /** * @returns @c true if the socket's synchronous operations will fail with * boost::asio::error::would_block if they are unable to perform the requested * operation immediately. If @c false, synchronous operations will block * until complete. * * @note The non-blocking mode has no effect on the behaviour of asynchronous * operations. Asynchronous operations will never fail with the error * boost::asio::error::would_block. */ bool non_blocking() const { return this->get_service().non_blocking(this->get_implementation()); } /// Sets the non-blocking mode of the socket. /** * @param mode If @c true, the socket's synchronous operations will fail with * boost::asio::error::would_block if they are unable to perform the requested * operation immediately. If @c false, synchronous operations will block * until complete. * * @throws boost::system::system_error Thrown on failure. * * @note The non-blocking mode has no effect on the behaviour of asynchronous * operations. Asynchronous operations will never fail with the error * boost::asio::error::would_block. */ void non_blocking(bool mode) { boost::system::error_code ec; this->get_service().non_blocking(this->get_implementation(), mode, ec); boost::asio::detail::throw_error(ec, "non_blocking"); } /// Sets the non-blocking mode of the socket. /** * @param mode If @c true, the socket's synchronous operations will fail with * boost::asio::error::would_block if they are unable to perform the requested * operation immediately. If @c false, synchronous operations will block * until complete. * * @param ec Set to indicate what error occurred, if any. * * @note The non-blocking mode has no effect on the behaviour of asynchronous * operations. Asynchronous operations will never fail with the error * boost::asio::error::would_block. */ BOOST_ASIO_SYNC_OP_VOID non_blocking( bool mode, boost::system::error_code& ec) { this->get_service().non_blocking(this->get_implementation(), mode, ec); BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } /// Gets the non-blocking mode of the native socket implementation. /** * This function is used to retrieve the non-blocking mode of the underlying * native socket. This mode has no effect on the behaviour of the socket * object's synchronous operations. * * @returns @c true if the underlying socket is in non-blocking mode and * direct system calls may fail with boost::asio::error::would_block (or the * equivalent system error). * * @note The current non-blocking mode is cached by the socket object. * Consequently, the return value may be incorrect if the non-blocking mode * was set directly on the native socket. * * @par Example * This function is intended to allow the encapsulation of arbitrary * non-blocking system calls as asynchronous operations, in a way that is * transparent to the user of the socket object. The following example * illustrates how Linux's @c sendfile system call might be encapsulated: * @code template <typename Handler> * struct sendfile_op * { * tcp::socket& sock_; * int fd_; * Handler handler_; * off_t offset_; * std::size_t total_bytes_transferred_; * * // Function call operator meeting WriteHandler requirements. * // Used as the handler for the async_write_some operation. * void operator()(boost::system::error_code ec, std::size_t) * { * // Put the underlying socket into non-blocking mode. * if (!ec) * if (!sock_.native_non_blocking()) * sock_.native_non_blocking(true, ec); * * if (!ec) * { * for (;;) * { * // Try the system call. * errno = 0; * int n = ::sendfile(sock_.native_handle(), fd_, &offset_, 65536); * ec = boost::system::error_code(n < 0 ? errno : 0, * boost::asio::error::get_system_category()); * total_bytes_transferred_ += ec ? 0 : n; * * // Retry operation immediately if interrupted by signal. * if (ec == boost::asio::error::interrupted) * continue; * * // Check if we need to run the operation again. * if (ec == boost::asio::error::would_block * || ec == boost::asio::error::try_again) * { * // We have to wait for the socket to become ready again. * sock_.async_wait(tcp::socket::wait_write, *this); * return; * } * * if (ec || n == 0) * { * // An error occurred, or we have reached the end of the file. * // Either way we must exit the loop so we can call the handler. * break; * } * * // Loop around to try calling sendfile again. * } * } * * // Pass result back to user's handler. * handler_(ec, total_bytes_transferred_); * } * }; * * template <typename Handler> * void async_sendfile(tcp::socket& sock, int fd, Handler h) * { * sendfile_op<Handler> op = { sock, fd, h, 0, 0 }; * sock.async_wait(tcp::socket::wait_write, op); * } @endcode */ bool native_non_blocking() const { return this->get_service().native_non_blocking(this->get_implementation()); } /// Sets the non-blocking mode of the native socket implementation. /** * This function is used to modify the non-blocking mode of the underlying * native socket. It has no effect on the behaviour of the socket object's * synchronous operations. * * @param mode If @c true, the underlying socket is put into non-blocking * mode and direct system calls may fail with boost::asio::error::would_block * (or the equivalent system error). * * @throws boost::system::system_error Thrown on failure. If the @c mode is * @c false, but the current value of @c non_blocking() is @c true, this * function fails with boost::asio::error::invalid_argument, as the * combination does not make sense. * * @par Example * This function is intended to allow the encapsulation of arbitrary * non-blocking system calls as asynchronous operations, in a way that is * transparent to the user of the socket object. The following example * illustrates how Linux's @c sendfile system call might be encapsulated: * @code template <typename Handler> * struct sendfile_op * { * tcp::socket& sock_; * int fd_; * Handler handler_; * off_t offset_; * std::size_t total_bytes_transferred_; * * // Function call operator meeting WriteHandler requirements. * // Used as the handler for the async_write_some operation. * void operator()(boost::system::error_code ec, std::size_t) * { * // Put the underlying socket into non-blocking mode. * if (!ec) * if (!sock_.native_non_blocking()) * sock_.native_non_blocking(true, ec); * * if (!ec) * { * for (;;) * { * // Try the system call. * errno = 0; * int n = ::sendfile(sock_.native_handle(), fd_, &offset_, 65536); * ec = boost::system::error_code(n < 0 ? errno : 0, * boost::asio::error::get_system_category()); * total_bytes_transferred_ += ec ? 0 : n; * * // Retry operation immediately if interrupted by signal. * if (ec == boost::asio::error::interrupted) * continue; * * // Check if we need to run the operation again. * if (ec == boost::asio::error::would_block * || ec == boost::asio::error::try_again) * { * // We have to wait for the socket to become ready again. * sock_.async_wait(tcp::socket::wait_write, *this); * return; * } * * if (ec || n == 0) * { * // An error occurred, or we have reached the end of the file. * // Either way we must exit the loop so we can call the handler. * break; * } * * // Loop around to try calling sendfile again. * } * } * * // Pass result back to user's handler. * handler_(ec, total_bytes_transferred_); * } * }; * * template <typename Handler> * void async_sendfile(tcp::socket& sock, int fd, Handler h) * { * sendfile_op<Handler> op = { sock, fd, h, 0, 0 }; * sock.async_wait(tcp::socket::wait_write, op); * } @endcode */ void native_non_blocking(bool mode) { boost::system::error_code ec; this->get_service().native_non_blocking( this->get_implementation(), mode, ec); boost::asio::detail::throw_error(ec, "native_non_blocking"); } /// Sets the non-blocking mode of the native socket implementation. /** * This function is used to modify the non-blocking mode of the underlying * native socket. It has no effect on the behaviour of the socket object's * synchronous operations. * * @param mode If @c true, the underlying socket is put into non-blocking * mode and direct system calls may fail with boost::asio::error::would_block * (or the equivalent system error). * * @param ec Set to indicate what error occurred, if any. If the @c mode is * @c false, but the current value of @c non_blocking() is @c true, this * function fails with boost::asio::error::invalid_argument, as the * combination does not make sense. * * @par Example * This function is intended to allow the encapsulation of arbitrary * non-blocking system calls as asynchronous operations, in a way that is * transparent to the user of the socket object. The following example * illustrates how Linux's @c sendfile system call might be encapsulated: * @code template <typename Handler> * struct sendfile_op * { * tcp::socket& sock_; * int fd_; * Handler handler_; * off_t offset_; * std::size_t total_bytes_transferred_; * * // Function call operator meeting WriteHandler requirements. * // Used as the handler for the async_write_some operation. * void operator()(boost::system::error_code ec, std::size_t) * { * // Put the underlying socket into non-blocking mode. * if (!ec) * if (!sock_.native_non_blocking()) * sock_.native_non_blocking(true, ec); * * if (!ec) * { * for (;;) * { * // Try the system call. * errno = 0; * int n = ::sendfile(sock_.native_handle(), fd_, &offset_, 65536); * ec = boost::system::error_code(n < 0 ? errno : 0, * boost::asio::error::get_system_category()); * total_bytes_transferred_ += ec ? 0 : n; * * // Retry operation immediately if interrupted by signal. * if (ec == boost::asio::error::interrupted) * continue; * * // Check if we need to run the operation again. * if (ec == boost::asio::error::would_block * || ec == boost::asio::error::try_again) * { * // We have to wait for the socket to become ready again. * sock_.async_wait(tcp::socket::wait_write, *this); * return; * } * * if (ec || n == 0) * { * // An error occurred, or we have reached the end of the file. * // Either way we must exit the loop so we can call the handler. * break; * } * * // Loop around to try calling sendfile again. * } * } * * // Pass result back to user's handler. * handler_(ec, total_bytes_transferred_); * } * }; * * template <typename Handler> * void async_sendfile(tcp::socket& sock, int fd, Handler h) * { * sendfile_op<Handler> op = { sock, fd, h, 0, 0 }; * sock.async_wait(tcp::socket::wait_write, op); * } @endcode */ BOOST_ASIO_SYNC_OP_VOID native_non_blocking( bool mode, boost::system::error_code& ec) { this->get_service().native_non_blocking( this->get_implementation(), mode, ec); BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } /// Get the local endpoint of the socket. /** * This function is used to obtain the locally bound endpoint of the socket. * * @returns An object that represents the local endpoint of the socket. * * @throws boost::system::system_error Thrown on failure. * * @par Example * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * boost::asio::ip::tcp::endpoint endpoint = socket.local_endpoint(); * @endcode */ endpoint_type local_endpoint() const { boost::system::error_code ec; endpoint_type ep = this->get_service().local_endpoint( this->get_implementation(), ec); boost::asio::detail::throw_error(ec, "local_endpoint"); return ep; } /// Get the local endpoint of the socket. /** * This function is used to obtain the locally bound endpoint of the socket. * * @param ec Set to indicate what error occurred, if any. * * @returns An object that represents the local endpoint of the socket. * Returns a default-constructed endpoint object if an error occurred. * * @par Example * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * boost::system::error_code ec; * boost::asio::ip::tcp::endpoint endpoint = socket.local_endpoint(ec); * if (ec) * { * // An error occurred. * } * @endcode */ endpoint_type local_endpoint(boost::system::error_code& ec) const { return this->get_service().local_endpoint(this->get_implementation(), ec); } /// Get the remote endpoint of the socket. /** * This function is used to obtain the remote endpoint of the socket. * * @returns An object that represents the remote endpoint of the socket. * * @throws boost::system::system_error Thrown on failure. * * @par Example * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * boost::asio::ip::tcp::endpoint endpoint = socket.remote_endpoint(); * @endcode */ endpoint_type remote_endpoint() const { boost::system::error_code ec; endpoint_type ep = this->get_service().remote_endpoint( this->get_implementation(), ec); boost::asio::detail::throw_error(ec, "remote_endpoint"); return ep; } /// Get the remote endpoint of the socket. /** * This function is used to obtain the remote endpoint of the socket. * * @param ec Set to indicate what error occurred, if any. * * @returns An object that represents the remote endpoint of the socket. * Returns a default-constructed endpoint object if an error occurred. * * @par Example * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * boost::system::error_code ec; * boost::asio::ip::tcp::endpoint endpoint = socket.remote_endpoint(ec); * if (ec) * { * // An error occurred. * } * @endcode */ endpoint_type remote_endpoint(boost::system::error_code& ec) const { return this->get_service().remote_endpoint(this->get_implementation(), ec); } /// Disable sends or receives on the socket. /** * This function is used to disable send operations, receive operations, or * both. * * @param what Determines what types of operation will no longer be allowed. * * @throws boost::system::system_error Thrown on failure. * * @par Example * Shutting down the send side of the socket: * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * socket.shutdown(boost::asio::ip::tcp::socket::shutdown_send); * @endcode */ void shutdown(shutdown_type what) { boost::system::error_code ec; this->get_service().shutdown(this->get_implementation(), what, ec); boost::asio::detail::throw_error(ec, "shutdown"); } /// Disable sends or receives on the socket. /** * This function is used to disable send operations, receive operations, or * both. * * @param what Determines what types of operation will no longer be allowed. * * @param ec Set to indicate what error occurred, if any. * * @par Example * Shutting down the send side of the socket: * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * boost::system::error_code ec; * socket.shutdown(boost::asio::ip::tcp::socket::shutdown_send, ec); * if (ec) * { * // An error occurred. * } * @endcode */ BOOST_ASIO_SYNC_OP_VOID shutdown(shutdown_type what, boost::system::error_code& ec) { this->get_service().shutdown(this->get_implementation(), what, ec); BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } /// Wait for the socket to become ready to read, ready to write, or to have /// pending error conditions. /** * This function is used to perform a blocking wait for a socket to enter * a ready to read, write or error condition state. * * @param w Specifies the desired socket state. * * @par Example * Waiting for a socket to become readable. * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * socket.wait(boost::asio::ip::tcp::socket::wait_read); * @endcode */ void wait(wait_type w) { boost::system::error_code ec; this->get_service().wait(this->get_implementation(), w, ec); boost::asio::detail::throw_error(ec, "wait"); } /// Wait for the socket to become ready to read, ready to write, or to have /// pending error conditions. /** * This function is used to perform a blocking wait for a socket to enter * a ready to read, write or error condition state. * * @param w Specifies the desired socket state. * * @param ec Set to indicate what error occurred, if any. * * @par Example * Waiting for a socket to become readable. * @code * boost::asio::ip::tcp::socket socket(io_context); * ... * boost::system::error_code ec; * socket.wait(boost::asio::ip::tcp::socket::wait_read, ec); * @endcode */ BOOST_ASIO_SYNC_OP_VOID wait(wait_type w, boost::system::error_code& ec) { this->get_service().wait(this->get_implementation(), w, ec); BOOST_ASIO_SYNC_OP_VOID_RETURN(ec); } /// Asynchronously wait for the socket to become ready to read, ready to /// write, or to have pending error conditions. /** * This function is used to perform an asynchronous wait for a socket to enter * a ready to read, write or error condition state. * * @param w Specifies the desired socket state. * * @param handler The handler to be called when the wait operation completes. * Copies will be made of the handler as required. The function signature of * the handler must be: * @code void handler( * const boost::system::error_code& error // Result of operation * ); @endcode * Regardless of whether the asynchronous operation completes immediately or * not, the handler will not be invoked from within this function. Invocation * of the handler will be performed in a manner equivalent to using * boost::asio::io_context::post(). * * @par Example * @code * void wait_handler(const boost::system::error_code& error) * { * if (!error) * { * // Wait succeeded. * } * } * * ... * * boost::asio::ip::tcp::socket socket(io_context); * ... * socket.async_wait(boost::asio::ip::tcp::socket::wait_read, wait_handler); * @endcode */ template <typename WaitHandler> BOOST_ASIO_INITFN_RESULT_TYPE(WaitHandler, void (boost::system::error_code)) async_wait(wait_type w, BOOST_ASIO_MOVE_ARG(WaitHandler) handler) { // If you get an error on the following line it means that your handler does // not meet the documented type requirements for a WaitHandler. BOOST_ASIO_WAIT_HANDLER_CHECK(WaitHandler, handler) type_check; #if defined(BOOST_ASIO_ENABLE_OLD_SERVICES) return this->get_service().async_wait(this->get_implementation(), w, BOOST_ASIO_MOVE_CAST(WaitHandler)(handler)); #else // defined(BOOST_ASIO_ENABLE_OLD_SERVICES) async_completion<WaitHandler, void (boost::system::error_code)> init(handler); this->get_service().async_wait(this->get_implementation(), w, init.completion_handler); return init.result.get(); #endif // defined(BOOST_ASIO_ENABLE_OLD_SERVICES) } protected: /// Protected destructor to prevent deletion through this type. /** * This function destroys the socket, cancelling any outstanding asynchronous * operations associated with the socket as if by calling @c cancel. */ ~basic_socket() { } private: // Disallow copying and assignment. basic_socket(const basic_socket&) BOOST_ASIO_DELETED; basic_socket& operator=(const basic_socket&) BOOST_ASIO_DELETED; }; } // namespace asio } // namespace boost #include <boost/asio/detail/pop_options.hpp> #if !defined(BOOST_ASIO_ENABLE_OLD_SERVICES) # undef BOOST_ASIO_SVC_T #endif // !defined(BOOST_ASIO_ENABLE_OLD_SERVICES) #endif // BOOST_ASIO_BASIC_SOCKET_HPP