//
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// posix/descriptor_base.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2018 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_POSIX_DESCRIPTOR_BASE_HPP
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#define ASIO_POSIX_DESCRIPTOR_BASE_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_POSIX_STREAM_DESCRIPTOR) \
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|| defined(GENERATING_DOCUMENTATION)
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#include "asio/detail/io_control.hpp"
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#include "asio/detail/socket_option.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace posix {
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/// The descriptor_base class is used as a base for the descriptor class as a
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/// place to define the associated IO control commands.
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class descriptor_base
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{
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public:
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/// Wait types.
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/**
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* For use with descriptor::wait() and descriptor::async_wait().
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*/
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enum wait_type
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{
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/// Wait for a descriptor to become ready to read.
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wait_read,
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/// Wait for a descriptor to become ready to write.
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wait_write,
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/// Wait for a descriptor to have error conditions pending.
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wait_error
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};
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/// IO control command to get the amount of data that can be read without
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/// blocking.
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/**
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* Implements the FIONREAD IO control command.
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*
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* @par Example
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* @code
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* asio::posix::stream_descriptor descriptor(io_context);
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* ...
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* asio::descriptor_base::bytes_readable command(true);
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* descriptor.io_control(command);
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* std::size_t bytes_readable = command.get();
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* @endcode
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*
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* @par Concepts:
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* IoControlCommand.
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*/
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#if defined(GENERATING_DOCUMENTATION)
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typedef implementation_defined bytes_readable;
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#else
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typedef asio::detail::io_control::bytes_readable bytes_readable;
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#endif
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protected:
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/// Protected destructor to prevent deletion through this type.
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~descriptor_base()
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{
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}
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};
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} // namespace posix
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // defined(ASIO_HAS_POSIX_STREAM_DESCRIPTOR)
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// || defined(GENERATING_DOCUMENTATION)
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#endif // ASIO_POSIX_DESCRIPTOR_BASE_HPP
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