91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
//
|
|
// posix/descriptor_base.hpp
|
|
// ~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
//
|
|
// Copyright (c) 2003-2023 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(my_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
|