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