mitigate.hpp

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// Copyright (c) 2006, 2007 Julio M. Merino Vidal
// Copyright (c) 2008 Ilya Sokolov, Boris Schaeling
// Copyright (c) 2009 Boris Schaeling
// Copyright (c) 2010 Felipe Tanus, Boris Schaeling
// Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling
//
// 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)
 
/**
 * \file boost/process/mitigate.hpp
 *
 * Helpers to mitigate platform differences.
 */
 
#pragma once
 
#include <boost/asio.hpp>
#if defined(BOOST_POSIX_API)
#   include <sys/wait.h>
#endif
 
namespace boost
{
    namespace process
    {
 
#if defined(BOOST_WINDOWS_API)
        using pipe_end = boost::asio::windows::stream_handle;
#elif defined(BOOST_POSIX_API)
        using pipe_end = boost::asio::posix::stream_descriptor;
#endif
 
        inline const char* zero_device()
        {
#if defined(BOOST_WINDOWS_API)
            return "NUL";
#elif defined(BOOST_POSIX_API)
            return "/dev/zero";
#endif
        }
 
        inline const char* null_device()
        {
#if defined(BOOST_WINDOWS_API)
            return "NUL";
#elif defined(BOOST_POSIX_API)
            return "/dev/null";
#endif
        }
 
#if defined(BOOST_WINDOWS_API)
#   define BOOST_PROCESS_EXITSTATUS(a) static_cast<int>(a)
#elif defined(BOOST_POSIX_API)
#   define BOOST_PROCESS_EXITSTATUS WEXITSTATUS
#endif
 
#if defined(BOOST_PROCESS_DOXYGEN)
        /**
         * Type definition for the end of a pipe.
         *
         * On Windows the type is based on boost::asio::windows::stream_handle. On
         * POSIX it is based on boost::asio::posix::stream_descriptor.
         *
         * You can use this type definition for asynchronous I/O with streams of
         * child processes.
         */
        using pipe_end = boost_asio_type;
 
        /**
         * Gets the name of the zero device.
         *
         * You can use zero_device to initialize a
         * boost::iostreams::file_descriptor_source to read
         * null characters from.
         *
         * \returns NUL on Windows and /dev/zero on POSIX.
         */
        const char* zero_device();
 
        /**
         * Gets the name of the null device.
         *
         * You can use null_device to initialize a
         * boost::iostreams::file_descriptor_sink which discards
         * data written to it.
         *
         * \returns NUL on Windows and /dev/null on POSIX.
         */
        const char* null_device();
 
        /**
         * \def BOOST_PROCESS_EXITSTATUS
         *
         * On Windows \c BOOST_PROCESS_EXITSTATUS is a static cast to \c int.
         * On POSIX it is set to \c WEXITSTATUS.
         *
         * You can use \c BOOST_PROCESS_EXITSTATUS for the return value of
         * boost::process::wait_for_exit to get the exit status of a process.
         */
#define BOOST_PROCESS_EXITSTATUS
#endif
 
    }
}