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Diffstat (limited to 'lib/asio/posix/basic_descriptor.hpp')
| -rw-r--r-- | lib/asio/posix/basic_descriptor.hpp | 582 |
1 files changed, 582 insertions, 0 deletions
diff --git a/lib/asio/posix/basic_descriptor.hpp b/lib/asio/posix/basic_descriptor.hpp new file mode 100644 index 0000000..c15da63 --- /dev/null +++ b/lib/asio/posix/basic_descriptor.hpp @@ -0,0 +1,582 @@ +// +// posix/basic_descriptor.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 ASIO_POSIX_BASIC_DESCRIPTOR_HPP +#define ASIO_POSIX_BASIC_DESCRIPTOR_HPP + +#if defined(_MSC_VER) && (_MSC_VER >= 1200) +# pragma once +#endif // defined(_MSC_VER) && (_MSC_VER >= 1200) + +#include "asio/detail/config.hpp" + +#if defined(ASIO_ENABLE_OLD_SERVICES) + +#if defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR) \ + || defined(GENERATING_DOCUMENTATION) + +#include "asio/basic_io_object.hpp" +#include "asio/detail/throw_error.hpp" +#include "asio/error.hpp" +#include "asio/posix/descriptor_base.hpp" + +#include "asio/detail/push_options.hpp" + +namespace asio { +namespace posix { + +/// Provides POSIX descriptor functionality. +/** + * The posix::basic_descriptor class template provides the ability to wrap a + * POSIX descriptor. + * + * @par Thread Safety + * @e Distinct @e objects: Safe.@n + * @e Shared @e objects: Unsafe. + */ +template <typename DescriptorService> +class basic_descriptor + : public basic_io_object<DescriptorService>, + public descriptor_base +{ +public: + /// The native representation of a descriptor. + typedef typename DescriptorService::native_handle_type native_handle_type; + + /// A basic_descriptor is always the lowest layer. + typedef basic_descriptor<DescriptorService> lowest_layer_type; + + /// Construct a basic_descriptor without opening it. + /** + * This constructor creates a descriptor without opening it. + * + * @param io_context The io_context object that the descriptor will use to + * dispatch handlers for any asynchronous operations performed on the + * descriptor. + */ + explicit basic_descriptor(asio::io_context& io_context) + : basic_io_object<DescriptorService>(io_context) + { + } + + /// Construct a basic_descriptor on an existing native descriptor. + /** + * This constructor creates a descriptor object to hold an existing native + * descriptor. + * + * @param io_context The io_context object that the descriptor will use to + * dispatch handlers for any asynchronous operations performed on the + * descriptor. + * + * @param native_descriptor A native descriptor. + * + * @throws asio::system_error Thrown on failure. + */ + basic_descriptor(asio::io_context& io_context, + const native_handle_type& native_descriptor) + : basic_io_object<DescriptorService>(io_context) + { + asio::error_code ec; + this->get_service().assign(this->get_implementation(), + native_descriptor, ec); + asio::detail::throw_error(ec, "assign"); + } + +#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION) + /// Move-construct a basic_descriptor from another. + /** + * This constructor moves a descriptor from one object to another. + * + * @param other The other basic_descriptor 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_descriptor(io_context&) constructor. + */ + basic_descriptor(basic_descriptor&& other) + : basic_io_object<DescriptorService>( + ASIO_MOVE_CAST(basic_descriptor)(other)) + { + } + + /// Move-assign a basic_descriptor from another. + /** + * This assignment operator moves a descriptor from one object to another. + * + * @param other The other basic_descriptor 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_descriptor(io_context&) constructor. + */ + basic_descriptor& operator=(basic_descriptor&& other) + { + basic_io_object<DescriptorService>::operator=( + ASIO_MOVE_CAST(basic_descriptor)(other)); + return *this; + } +#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION) + + /// Get a reference to the lowest layer. + /** + * This function returns a reference to the lowest layer in a stack of + * layers. Since a basic_descriptor 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_descriptor 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; + } + + /// Assign an existing native descriptor to the descriptor. + /* + * This function opens the descriptor to hold an existing native descriptor. + * + * @param native_descriptor A native descriptor. + * + * @throws asio::system_error Thrown on failure. + */ + void assign(const native_handle_type& native_descriptor) + { + asio::error_code ec; + this->get_service().assign(this->get_implementation(), + native_descriptor, ec); + asio::detail::throw_error(ec, "assign"); + } + + /// Assign an existing native descriptor to the descriptor. + /* + * This function opens the descriptor to hold an existing native descriptor. + * + * @param native_descriptor A native descriptor. + * + * @param ec Set to indicate what error occurred, if any. + */ + ASIO_SYNC_OP_VOID assign(const native_handle_type& native_descriptor, + asio::error_code& ec) + { + this->get_service().assign( + this->get_implementation(), native_descriptor, ec); + ASIO_SYNC_OP_VOID_RETURN(ec); + } + + /// Determine whether the descriptor is open. + bool is_open() const + { + return this->get_service().is_open(this->get_implementation()); + } + + /// Close the descriptor. + /** + * This function is used to close the descriptor. Any asynchronous read or + * write operations will be cancelled immediately, and will complete with the + * asio::error::operation_aborted error. + * + * @throws asio::system_error Thrown on failure. Note that, even if + * the function indicates an error, the underlying descriptor is closed. + */ + void close() + { + asio::error_code ec; + this->get_service().close(this->get_implementation(), ec); + asio::detail::throw_error(ec, "close"); + } + + /// Close the descriptor. + /** + * This function is used to close the descriptor. Any asynchronous read or + * write operations will be cancelled immediately, and will complete with the + * 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. + */ + ASIO_SYNC_OP_VOID close(asio::error_code& ec) + { + this->get_service().close(this->get_implementation(), ec); + ASIO_SYNC_OP_VOID_RETURN(ec); + } + + /// Get the native descriptor representation. + /** + * This function may be used to obtain the underlying representation of the + * descriptor. This is intended to allow access to native descriptor + * functionality that is not otherwise provided. + */ + native_handle_type native_handle() + { + return this->get_service().native_handle(this->get_implementation()); + } + + /// Release ownership of the native descriptor implementation. + /** + * This function may be used to obtain the underlying representation of the + * descriptor. After calling this function, @c is_open() returns false. The + * caller is responsible for closing the descriptor. + * + * All outstanding asynchronous read or write operations will finish + * immediately, and the handlers for cancelled operations will be passed the + * asio::error::operation_aborted error. + */ + native_handle_type release() + { + return this->get_service().release(this->get_implementation()); + } + + /// Cancel all asynchronous operations associated with the descriptor. + /** + * This function causes all outstanding asynchronous read or write operations + * to finish immediately, and the handlers for cancelled operations will be + * passed the asio::error::operation_aborted error. + * + * @throws asio::system_error Thrown on failure. + */ + void cancel() + { + asio::error_code ec; + this->get_service().cancel(this->get_implementation(), ec); + asio::detail::throw_error(ec, "cancel"); + } + + /// Cancel all asynchronous operations associated with the descriptor. + /** + * This function causes all outstanding asynchronous read or write operations + * to finish immediately, and the handlers for cancelled operations will be + * passed the asio::error::operation_aborted error. + * + * @param ec Set to indicate what error occurred, if any. + */ + ASIO_SYNC_OP_VOID cancel(asio::error_code& ec) + { + this->get_service().cancel(this->get_implementation(), ec); + ASIO_SYNC_OP_VOID_RETURN(ec); + } + + /// Perform an IO control command on the descriptor. + /** + * This function is used to execute an IO control command on the descriptor. + * + * @param command The IO control command to be performed on the descriptor. + * + * @throws asio::system_error Thrown on failure. + * + * @sa IoControlCommand @n + * asio::posix::descriptor_base::bytes_readable @n + * asio::posix::descriptor_base::non_blocking_io + * + * @par Example + * Getting the number of bytes ready to read: + * @code + * asio::posix::stream_descriptor descriptor(io_context); + * ... + * asio::posix::stream_descriptor::bytes_readable command; + * descriptor.io_control(command); + * std::size_t bytes_readable = command.get(); + * @endcode + */ + template <typename IoControlCommand> + void io_control(IoControlCommand& command) + { + asio::error_code ec; + this->get_service().io_control(this->get_implementation(), command, ec); + asio::detail::throw_error(ec, "io_control"); + } + + /// Perform an IO control command on the descriptor. + /** + * This function is used to execute an IO control command on the descriptor. + * + * @param command The IO control command to be performed on the descriptor. + * + * @param ec Set to indicate what error occurred, if any. + * + * @sa IoControlCommand @n + * asio::posix::descriptor_base::bytes_readable @n + * asio::posix::descriptor_base::non_blocking_io + * + * @par Example + * Getting the number of bytes ready to read: + * @code + * asio::posix::stream_descriptor descriptor(io_context); + * ... + * asio::posix::stream_descriptor::bytes_readable command; + * asio::error_code ec; + * descriptor.io_control(command, ec); + * if (ec) + * { + * // An error occurred. + * } + * std::size_t bytes_readable = command.get(); + * @endcode + */ + template <typename IoControlCommand> + ASIO_SYNC_OP_VOID io_control(IoControlCommand& command, + asio::error_code& ec) + { + this->get_service().io_control(this->get_implementation(), command, ec); + ASIO_SYNC_OP_VOID_RETURN(ec); + } + + /// Gets the non-blocking mode of the descriptor. + /** + * @returns @c true if the descriptor's synchronous operations will fail with + * 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 + * asio::error::would_block. + */ + bool non_blocking() const + { + return this->get_service().non_blocking(this->get_implementation()); + } + + /// Sets the non-blocking mode of the descriptor. + /** + * @param mode If @c true, the descriptor's synchronous operations will fail + * with asio::error::would_block if they are unable to perform the + * requested operation immediately. If @c false, synchronous operations will + * block until complete. + * + * @throws asio::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 + * asio::error::would_block. + */ + void non_blocking(bool mode) + { + asio::error_code ec; + this->get_service().non_blocking(this->get_implementation(), mode, ec); + asio::detail::throw_error(ec, "non_blocking"); + } + + /// Sets the non-blocking mode of the descriptor. + /** + * @param mode If @c true, the descriptor's synchronous operations will fail + * with 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 + * asio::error::would_block. + */ + ASIO_SYNC_OP_VOID non_blocking( + bool mode, asio::error_code& ec) + { + this->get_service().non_blocking(this->get_implementation(), mode, ec); + ASIO_SYNC_OP_VOID_RETURN(ec); + } + + /// Gets the non-blocking mode of the native descriptor implementation. + /** + * This function is used to retrieve the non-blocking mode of the underlying + * native descriptor. This mode has no effect on the behaviour of the + * descriptor object's synchronous operations. + * + * @returns @c true if the underlying descriptor is in non-blocking mode and + * direct system calls may fail with asio::error::would_block (or the + * equivalent system error). + * + * @note The current non-blocking mode is cached by the descriptor object. + * Consequently, the return value may be incorrect if the non-blocking mode + * was set directly on the native descriptor. + */ + bool native_non_blocking() const + { + return this->get_service().native_non_blocking( + this->get_implementation()); + } + + /// Sets the non-blocking mode of the native descriptor implementation. + /** + * This function is used to modify the non-blocking mode of the underlying + * native descriptor. It has no effect on the behaviour of the descriptor + * object's synchronous operations. + * + * @param mode If @c true, the underlying descriptor is put into non-blocking + * mode and direct system calls may fail with asio::error::would_block + * (or the equivalent system error). + * + * @throws asio::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 asio::error::invalid_argument, as the + * combination does not make sense. + */ + void native_non_blocking(bool mode) + { + asio::error_code ec; + this->get_service().native_non_blocking( + this->get_implementation(), mode, ec); + asio::detail::throw_error(ec, "native_non_blocking"); + } + + /// Sets the non-blocking mode of the native descriptor implementation. + /** + * This function is used to modify the non-blocking mode of the underlying + * native descriptor. It has no effect on the behaviour of the descriptor + * object's synchronous operations. + * + * @param mode If @c true, the underlying descriptor is put into non-blocking + * mode and direct system calls may fail with 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 asio::error::invalid_argument, as the + * combination does not make sense. + */ + ASIO_SYNC_OP_VOID native_non_blocking( + bool mode, asio::error_code& ec) + { + this->get_service().native_non_blocking( + this->get_implementation(), mode, ec); + ASIO_SYNC_OP_VOID_RETURN(ec); + } + + /// Wait for the descriptor 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 descriptor to enter + * a ready to read, write or error condition state. + * + * @param w Specifies the desired descriptor state. + * + * @par Example + * Waiting for a descriptor to become readable. + * @code + * asio::posix::stream_descriptor descriptor(io_context); + * ... + * descriptor.wait(asio::posix::stream_descriptor::wait_read); + * @endcode + */ + void wait(wait_type w) + { + asio::error_code ec; + this->get_service().wait(this->get_implementation(), w, ec); + asio::detail::throw_error(ec, "wait"); + } + + /// Wait for the descriptor 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 descriptor to enter + * a ready to read, write or error condition state. + * + * @param w Specifies the desired descriptor state. + * + * @param ec Set to indicate what error occurred, if any. + * + * @par Example + * Waiting for a descriptor to become readable. + * @code + * asio::posix::stream_descriptor descriptor(io_context); + * ... + * asio::error_code ec; + * descriptor.wait(asio::posix::stream_descriptor::wait_read, ec); + * @endcode + */ + ASIO_SYNC_OP_VOID wait(wait_type w, asio::error_code& ec) + { + this->get_service().wait(this->get_implementation(), w, ec); + ASIO_SYNC_OP_VOID_RETURN(ec); + } + + /// Asynchronously wait for the descriptor 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 descriptor to + * enter a ready to read, write or error condition state. + * + * @param w Specifies the desired descriptor 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 asio::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 + * asio::io_context::post(). + * + * @par Example + * @code + * void wait_handler(const asio::error_code& error) + * { + * if (!error) + * { + * // Wait succeeded. + * } + * } + * + * ... + * + * asio::posix::stream_descriptor descriptor(io_context); + * ... + * descriptor.async_wait( + * asio::posix::stream_descriptor::wait_read, + * wait_handler); + * @endcode + */ + template <typename WaitHandler> + ASIO_INITFN_RESULT_TYPE(WaitHandler, + void (asio::error_code)) + async_wait(wait_type w, 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. + ASIO_WAIT_HANDLER_CHECK(WaitHandler, handler) type_check; + + return this->get_service().async_wait(this->get_implementation(), + w, ASIO_MOVE_CAST(WaitHandler)(handler)); + } + +protected: + /// Protected destructor to prevent deletion through this type. + ~basic_descriptor() + { + } +}; + +} // namespace posix +} // namespace asio + +#include "asio/detail/pop_options.hpp" + +#endif // defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR) + // || defined(GENERATING_DOCUMENTATION) + +#endif // defined(ASIO_ENABLE_OLD_SERVICES) + +#endif // ASIO_POSIX_BASIC_DESCRIPTOR_HPP |