636 lines
21 KiB
C++
636 lines
21 KiB
C++
//
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// basic_readable_pipe.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_BASIC_READABLE_PIPE_HPP
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#define ASIO_BASIC_READABLE_PIPE_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#if defined(ASIO_HAS_PIPE) \
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|| defined(GENERATING_DOCUMENTATION)
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#include <string>
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#include "asio/any_io_executor.hpp"
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#include "asio/async_result.hpp"
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#include "asio/detail/handler_type_requirements.hpp"
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#include "asio/detail/io_object_impl.hpp"
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#include "asio/detail/non_const_lvalue.hpp"
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#include "asio/detail/throw_error.hpp"
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#include "asio/detail/type_traits.hpp"
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#include "asio/error.hpp"
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#include "asio/execution_context.hpp"
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#if defined(ASIO_HAS_IOCP)
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# include "asio/detail/win_iocp_handle_service.hpp"
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#elif defined(ASIO_HAS_IO_URING_AS_DEFAULT)
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# include "asio/detail/io_uring_descriptor_service.hpp"
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#else
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# include "asio/detail/reactive_descriptor_service.hpp"
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#endif
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#if defined(ASIO_HAS_MOVE)
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# include <utility>
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#endif // defined(ASIO_HAS_MOVE)
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#include "asio/detail/push_options.hpp"
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namespace asio {
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/// Provides pipe functionality.
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/**
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* The basic_readable_pipe class provides a wrapper over pipe
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* functionality.
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*
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* @par Thread Safety
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* @e Distinct @e objects: Safe.@n
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* @e Shared @e objects: Unsafe.
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*/
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template <typename Executor = any_io_executor>
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class basic_readable_pipe
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{
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private:
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class initiate_async_read_some;
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public:
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/// The type of the executor associated with the object.
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typedef Executor executor_type;
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/// Rebinds the pipe type to another executor.
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template <typename Executor1>
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struct rebind_executor
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{
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/// The pipe type when rebound to the specified executor.
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typedef basic_readable_pipe<Executor1> other;
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};
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/// The native representation of a pipe.
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#if defined(GENERATING_DOCUMENTATION)
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typedef implementation_defined native_handle_type;
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#elif defined(ASIO_HAS_IOCP)
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typedef detail::win_iocp_handle_service::native_handle_type
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native_handle_type;
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#elif defined(ASIO_HAS_IO_URING_AS_DEFAULT)
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typedef detail::io_uring_descriptor_service::native_handle_type
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native_handle_type;
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#else
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typedef detail::reactive_descriptor_service::native_handle_type
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native_handle_type;
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#endif
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/// A basic_readable_pipe is always the lowest layer.
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typedef basic_readable_pipe lowest_layer_type;
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/// Construct a basic_readable_pipe without opening it.
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/**
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* This constructor creates a pipe without opening it.
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*
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* @param ex The I/O executor that the pipe will use, by default, to dispatch
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* handlers for any asynchronous operations performed on the pipe.
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*/
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explicit basic_readable_pipe(const executor_type& ex)
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: impl_(0, ex)
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{
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}
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/// Construct a basic_readable_pipe without opening it.
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/**
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* This constructor creates a pipe without opening it.
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*
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* @param context An execution context which provides the I/O executor that
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* the pipe will use, by default, to dispatch handlers for any asynchronous
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* operations performed on the pipe.
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*/
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template <typename ExecutionContext>
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explicit basic_readable_pipe(ExecutionContext& context,
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typename constraint<
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is_convertible<ExecutionContext&, execution_context&>::value,
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defaulted_constraint
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>::type = defaulted_constraint())
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: impl_(0, 0, context)
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{
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}
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/// Construct a basic_readable_pipe on an existing native pipe.
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/**
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* This constructor creates a pipe object to hold an existing native
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* pipe.
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*
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* @param ex The I/O executor that the pipe will use, by default, to
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* dispatch handlers for any asynchronous operations performed on the
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* pipe.
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*
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* @param native_pipe A native pipe.
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*
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* @throws asio::system_error Thrown on failure.
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*/
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basic_readable_pipe(const executor_type& ex,
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const native_handle_type& native_pipe)
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: impl_(0, ex)
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{
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asio::error_code ec;
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impl_.get_service().assign(impl_.get_implementation(),
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native_pipe, ec);
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asio::detail::throw_error(ec, "assign");
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}
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/// Construct a basic_readable_pipe on an existing native pipe.
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/**
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* This constructor creates a pipe object to hold an existing native
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* pipe.
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*
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* @param context An execution context which provides the I/O executor that
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* the pipe will use, by default, to dispatch handlers for any
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* asynchronous operations performed on the pipe.
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*
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* @param native_pipe A native pipe.
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*
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* @throws asio::system_error Thrown on failure.
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*/
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template <typename ExecutionContext>
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basic_readable_pipe(ExecutionContext& context,
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const native_handle_type& native_pipe,
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typename constraint<
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is_convertible<ExecutionContext&, execution_context&>::value
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>::type = 0)
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: impl_(0, 0, context)
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{
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asio::error_code ec;
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impl_.get_service().assign(impl_.get_implementation(),
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native_pipe, ec);
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asio::detail::throw_error(ec, "assign");
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}
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#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
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/// Move-construct a basic_readable_pipe from another.
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/**
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* This constructor moves a pipe from one object to another.
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*
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* @param other The other basic_readable_pipe object from which the move will
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* occur.
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*
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* @note Following the move, the moved-from object is in the same state as if
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* constructed using the @c basic_readable_pipe(const executor_type&)
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* constructor.
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*/
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basic_readable_pipe(basic_readable_pipe&& other)
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: impl_(std::move(other.impl_))
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{
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}
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/// Move-assign a basic_readable_pipe from another.
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/**
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* This assignment operator moves a pipe from one object to another.
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*
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* @param other The other basic_readable_pipe object from which the move will
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* occur.
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*
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* @note Following the move, the moved-from object is in the same state as if
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* constructed using the @c basic_readable_pipe(const executor_type&)
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* constructor.
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*/
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basic_readable_pipe& operator=(basic_readable_pipe&& other)
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{
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impl_ = std::move(other.impl_);
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return *this;
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}
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// All pipes have access to each other's implementations.
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template <typename Executor1>
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friend class basic_readable_pipe;
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/// Move-construct a basic_readable_pipe from a pipe of another executor type.
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/**
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* This constructor moves a pipe from one object to another.
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*
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* @param other The other basic_readable_pipe object from which the move will
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* occur.
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*
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* @note Following the move, the moved-from object is in the same state as if
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* constructed using the @c basic_readable_pipe(const executor_type&)
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* constructor.
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*/
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template <typename Executor1>
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basic_readable_pipe(basic_readable_pipe<Executor1>&& other,
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typename constraint<
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is_convertible<Executor1, Executor>::value,
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defaulted_constraint
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>::type = defaulted_constraint())
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: impl_(std::move(other.impl_))
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{
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}
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/// Move-assign a basic_readable_pipe from a pipe of another executor type.
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/**
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* This assignment operator moves a pipe from one object to another.
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*
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* @param other The other basic_readable_pipe object from which the move will
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* occur.
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*
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* @note Following the move, the moved-from object is in the same state as if
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* constructed using the @c basic_readable_pipe(const executor_type&)
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* constructor.
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*/
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template <typename Executor1>
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typename constraint<
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is_convertible<Executor1, Executor>::value,
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basic_readable_pipe&
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>::type operator=(basic_readable_pipe<Executor1>&& other)
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{
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basic_readable_pipe tmp(std::move(other));
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impl_ = std::move(tmp.impl_);
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return *this;
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}
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#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
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/// Destroys the pipe.
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/**
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* This function destroys the pipe, cancelling any outstanding
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* asynchronous wait operations associated with the pipe as if by
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* calling @c cancel.
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*/
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~basic_readable_pipe()
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{
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}
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/// Get the executor associated with the object.
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const executor_type& get_executor() ASIO_NOEXCEPT
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{
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return impl_.get_executor();
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}
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/// Get a reference to the lowest layer.
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/**
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* This function returns a reference to the lowest layer in a stack of
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* layers. Since a basic_readable_pipe cannot contain any further layers, it
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* simply returns a reference to itself.
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*
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* @return A reference to the lowest layer in the stack of layers. Ownership
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* is not transferred to the caller.
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*/
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lowest_layer_type& lowest_layer()
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{
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return *this;
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}
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/// Get a const reference to the lowest layer.
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/**
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* This function returns a const reference to the lowest layer in a stack of
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* layers. Since a basic_readable_pipe cannot contain any further layers, it
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* simply returns a reference to itself.
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*
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* @return A const reference to the lowest layer in the stack of layers.
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* Ownership is not transferred to the caller.
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*/
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const lowest_layer_type& lowest_layer() const
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{
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return *this;
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}
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/// Assign an existing native pipe to the pipe.
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/*
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* This function opens the pipe to hold an existing native pipe.
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*
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* @param native_pipe A native pipe.
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*
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* @throws asio::system_error Thrown on failure.
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*/
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void assign(const native_handle_type& native_pipe)
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{
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asio::error_code ec;
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impl_.get_service().assign(impl_.get_implementation(), native_pipe, ec);
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asio::detail::throw_error(ec, "assign");
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}
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/// Assign an existing native pipe to the pipe.
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/*
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* This function opens the pipe to hold an existing native pipe.
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*
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* @param native_pipe A native pipe.
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*
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* @param ec Set to indicate what error occurred, if any.
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*/
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ASIO_SYNC_OP_VOID assign(const native_handle_type& native_pipe,
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asio::error_code& ec)
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{
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impl_.get_service().assign(impl_.get_implementation(), native_pipe, ec);
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ASIO_SYNC_OP_VOID_RETURN(ec);
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}
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/// Determine whether the pipe is open.
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bool is_open() const
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{
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return impl_.get_service().is_open(impl_.get_implementation());
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}
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/// Close the pipe.
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/**
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* This function is used to close the pipe. Any asynchronous read operations
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* will be cancelled immediately, and will complete with the
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* asio::error::operation_aborted error.
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*
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* @throws asio::system_error Thrown on failure.
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*/
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void close()
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{
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asio::error_code ec;
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impl_.get_service().close(impl_.get_implementation(), ec);
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asio::detail::throw_error(ec, "close");
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}
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/// Close the pipe.
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/**
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* This function is used to close the pipe. Any asynchronous read operations
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* will be cancelled immediately, and will complete with the
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* asio::error::operation_aborted error.
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*
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* @param ec Set to indicate what error occurred, if any.
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*/
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ASIO_SYNC_OP_VOID close(asio::error_code& ec)
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{
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impl_.get_service().close(impl_.get_implementation(), ec);
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ASIO_SYNC_OP_VOID_RETURN(ec);
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}
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/// Release ownership of the underlying native pipe.
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/**
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* This function causes all outstanding asynchronous read operations to
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* finish immediately, and the handlers for cancelled operations will be
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* passed the asio::error::operation_aborted error. Ownership of the
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* native pipe is then transferred to the caller.
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*
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* @throws asio::system_error Thrown on failure.
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*
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* @note This function is unsupported on Windows versions prior to Windows
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* 8.1, and will fail with asio::error::operation_not_supported on
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* these platforms.
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*/
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#if defined(ASIO_MSVC) && (ASIO_MSVC >= 1400) \
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&& (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603)
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__declspec(deprecated("This function always fails with "
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"operation_not_supported when used on Windows versions "
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"prior to Windows 8.1."))
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#endif
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native_handle_type release()
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{
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asio::error_code ec;
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native_handle_type s = impl_.get_service().release(
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impl_.get_implementation(), ec);
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asio::detail::throw_error(ec, "release");
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return s;
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}
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/// Release ownership of the underlying native pipe.
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/**
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* This function causes all outstanding asynchronous read operations to
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* finish immediately, and the handlers for cancelled operations will be
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* passed the asio::error::operation_aborted error. Ownership of the
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* native pipe is then transferred to the caller.
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*
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* @param ec Set to indicate what error occurred, if any.
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*
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* @note This function is unsupported on Windows versions prior to Windows
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* 8.1, and will fail with asio::error::operation_not_supported on
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* these platforms.
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*/
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#if defined(ASIO_MSVC) && (ASIO_MSVC >= 1400) \
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&& (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603)
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__declspec(deprecated("This function always fails with "
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"operation_not_supported when used on Windows versions "
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"prior to Windows 8.1."))
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#endif
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native_handle_type release(asio::error_code& ec)
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{
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return impl_.get_service().release(impl_.get_implementation(), ec);
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}
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/// Get the native pipe representation.
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/**
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* This function may be used to obtain the underlying representation of the
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* pipe. This is intended to allow access to native pipe
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* functionality that is not otherwise provided.
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*/
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native_handle_type native_handle()
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{
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return impl_.get_service().native_handle(impl_.get_implementation());
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}
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/// Cancel all asynchronous operations associated with the pipe.
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/**
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* This function causes all outstanding asynchronous read operations to finish
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* immediately, and the handlers for cancelled operations will be passed the
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* asio::error::operation_aborted error.
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*
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* @throws asio::system_error Thrown on failure.
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*/
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void cancel()
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{
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asio::error_code ec;
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impl_.get_service().cancel(impl_.get_implementation(), ec);
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asio::detail::throw_error(ec, "cancel");
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}
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/// Cancel all asynchronous operations associated with the pipe.
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/**
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* This function causes all outstanding asynchronous read operations to finish
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* immediately, and the handlers for cancelled operations will be passed the
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* asio::error::operation_aborted error.
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*
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* @param ec Set to indicate what error occurred, if any.
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*/
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ASIO_SYNC_OP_VOID cancel(asio::error_code& ec)
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{
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impl_.get_service().cancel(impl_.get_implementation(), ec);
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ASIO_SYNC_OP_VOID_RETURN(ec);
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}
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/// Read some data from the pipe.
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/**
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* This function is used to read data from the pipe. The function call will
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* block until one or more bytes of data has been read successfully, or until
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* an error occurs.
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*
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* @param buffers One or more buffers into which the data will be read.
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*
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* @returns The number of bytes read.
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*
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* @throws asio::system_error Thrown on failure. An error code of
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* asio::error::eof indicates that the connection was closed by the
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* peer.
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*
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* @note The read_some operation may not read all of the requested number of
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* bytes. Consider using the @ref read function if you need to ensure that
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* the requested amount of data is read before the blocking operation
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* completes.
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*
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* @par Example
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* To read into a single data buffer use the @ref buffer function as follows:
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* @code
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* basic_readable_pipe.read_some(asio::buffer(data, size));
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* @endcode
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* See the @ref buffer documentation for information on reading into multiple
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* buffers in one go, and how to use it with arrays, boost::array or
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* std::vector.
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*/
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template <typename MutableBufferSequence>
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std::size_t read_some(const MutableBufferSequence& buffers)
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{
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asio::error_code ec;
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std::size_t s = impl_.get_service().read_some(
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impl_.get_implementation(), buffers, ec);
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asio::detail::throw_error(ec, "read_some");
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return s;
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}
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/// Read some data from the pipe.
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/**
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* This function is used to read data from the pipe. The function call will
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* block until one or more bytes of data has been read successfully, or until
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* an error occurs.
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*
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* @param buffers One or more buffers into which the data will be read.
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*
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* @param ec Set to indicate what error occurred, if any.
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*
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* @returns The number of bytes read. Returns 0 if an error occurred.
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*
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* @note The read_some operation may not read all of the requested number of
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* bytes. Consider using the @ref read function if you need to ensure that
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* the requested amount of data is read before the blocking operation
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* completes.
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*/
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template <typename MutableBufferSequence>
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std::size_t read_some(const MutableBufferSequence& buffers,
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asio::error_code& ec)
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{
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return impl_.get_service().read_some(
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impl_.get_implementation(), buffers, ec);
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}
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/// Start an asynchronous read.
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/**
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* This function is used to asynchronously read data from the pipe. It is an
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* initiating function for an @ref asynchronous_operation, and always returns
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* immediately.
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|
*
|
|
* @param buffers One or more buffers into which the data will be read.
|
|
* Although the buffers object may be copied as necessary, ownership of the
|
|
* underlying memory blocks is retained by the caller, which must guarantee
|
|
* that they remain valid until the completion handler is called.
|
|
*
|
|
* @param token The @ref completion_token that will be used to produce a
|
|
* completion handler, which will be called when the read completes.
|
|
* Potential completion tokens include @ref use_future, @ref use_awaitable,
|
|
* @ref yield_context, or a function object with the correct completion
|
|
* signature. The function signature of the completion handler must be:
|
|
* @code void handler(
|
|
* const asio::error_code& error, // Result of operation.
|
|
* std::size_t bytes_transferred // Number of bytes read.
|
|
* ); @endcode
|
|
* Regardless of whether the asynchronous operation completes immediately or
|
|
* not, the completion handler will not be invoked from within this function.
|
|
* On immediate completion, invocation of the handler will be performed in a
|
|
* manner equivalent to using asio::post().
|
|
*
|
|
* @par Completion Signature
|
|
* @code void(asio::error_code, std::size_t) @endcode
|
|
*
|
|
* @note The read operation may not read all of the requested number of bytes.
|
|
* Consider using the @ref async_read function if you need to ensure that the
|
|
* requested amount of data is read before the asynchronous operation
|
|
* completes.
|
|
*
|
|
* @par Example
|
|
* To read into a single data buffer use the @ref buffer function as follows:
|
|
* @code
|
|
* basic_readable_pipe.async_read_some(
|
|
* asio::buffer(data, size), handler);
|
|
* @endcode
|
|
* See the @ref buffer documentation for information on reading into multiple
|
|
* buffers in one go, and how to use it with arrays, boost::array or
|
|
* std::vector.
|
|
*/
|
|
template <typename MutableBufferSequence,
|
|
ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
|
|
std::size_t)) ReadToken
|
|
ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_PREFIX(ReadToken,
|
|
void (asio::error_code, std::size_t))
|
|
async_read_some(const MutableBufferSequence& buffers,
|
|
ASIO_MOVE_ARG(ReadToken) token
|
|
ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
|
|
ASIO_INITFN_AUTO_RESULT_TYPE_SUFFIX((
|
|
async_initiate<ReadToken,
|
|
void (asio::error_code, std::size_t)>(
|
|
declval<initiate_async_read_some>(), token, buffers)))
|
|
{
|
|
return async_initiate<ReadToken,
|
|
void (asio::error_code, std::size_t)>(
|
|
initiate_async_read_some(this), token, buffers);
|
|
}
|
|
|
|
private:
|
|
// Disallow copying and assignment.
|
|
basic_readable_pipe(const basic_readable_pipe&) ASIO_DELETED;
|
|
basic_readable_pipe& operator=(const basic_readable_pipe&) ASIO_DELETED;
|
|
|
|
class initiate_async_read_some
|
|
{
|
|
public:
|
|
typedef Executor executor_type;
|
|
|
|
explicit initiate_async_read_some(basic_readable_pipe* self)
|
|
: self_(self)
|
|
{
|
|
}
|
|
|
|
const executor_type& get_executor() const ASIO_NOEXCEPT
|
|
{
|
|
return self_->get_executor();
|
|
}
|
|
|
|
template <typename ReadHandler, typename MutableBufferSequence>
|
|
void operator()(ASIO_MOVE_ARG(ReadHandler) handler,
|
|
const MutableBufferSequence& buffers) const
|
|
{
|
|
// If you get an error on the following line it means that your handler
|
|
// does not meet the documented type requirements for a ReadHandler.
|
|
ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
|
|
|
|
detail::non_const_lvalue<ReadHandler> handler2(handler);
|
|
self_->impl_.get_service().async_read_some(
|
|
self_->impl_.get_implementation(), buffers,
|
|
handler2.value, self_->impl_.get_executor());
|
|
}
|
|
|
|
private:
|
|
basic_readable_pipe* self_;
|
|
};
|
|
|
|
#if defined(ASIO_HAS_IOCP)
|
|
detail::io_object_impl<detail::win_iocp_handle_service, Executor> impl_;
|
|
#elif defined(ASIO_HAS_IO_URING_AS_DEFAULT)
|
|
detail::io_object_impl<detail::io_uring_descriptor_service, Executor> impl_;
|
|
#else
|
|
detail::io_object_impl<detail::reactive_descriptor_service, Executor> impl_;
|
|
#endif
|
|
};
|
|
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#endif // defined(ASIO_HAS_PIPE)
|
|
// || defined(GENERATING_DOCUMENTATION)
|
|
|
|
#endif // ASIO_BASIC_READABLE_PIPE_HPP
|