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108 lines
3 KiB
C++
108 lines
3 KiB
C++
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// Copyright (c) 2019 Klemens D. Morgenstern
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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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#ifndef BOOST_PROCESS_HANDLES_HPP_
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#define BOOST_PROCESS_HANDLES_HPP_
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/**
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* \file boost/process/handles.hpp
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*
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* Defines functions to obtain handles of the current process and limit the amount for inherited ones.
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*/
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#include <boost/process/detail/config.hpp>
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#if defined(BOOST_POSIX_API)
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#include <boost/process/detail/posix/handles.hpp>
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#elif defined(BOOST_WINDOWS_API)
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#include <boost/process/detail/windows/handles.hpp>
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#endif
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#include <boost/process/detail/used_handles.hpp>
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namespace boost { namespace this_process
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{
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///The native type for handles
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using native_handle_type = ::boost::process::detail::api::native_handle_type;
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/**
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* Get a snapshot of all handles of the process (i.e. file descriptors on posix and handles on windows) of the current process.
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*
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* \note This function might not work on certain posix systems.
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*
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* \note On Windows version older than windows 8 this function will iterate all the system handles, meaning it might be quite slow.
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*
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* \warning This functionality is utterly prone to race conditions, since other threads might open or close handles.
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*
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* \return The list of all open handles of the current process
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*/
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inline std::vector<native_handle_type> get_handles()
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{
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return ::boost::process::detail::api::get_handles();
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}
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/** \overload std::vector<native_handle_type> get_handles() */
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inline std::vector<native_handle_type> get_handles(std::error_code &ec)
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{
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return ::boost::process::detail::api::get_handles(ec);
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}
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/** Determines if a given handle is a a stream-handle, i.e. any handle that can be used with read and write functions.
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* Stream handles include pipes, regular files and sockets.
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*
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* \return Indicates if it's a stream handle.
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*/
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inline bool is_stream_handle(native_handle_type handle)
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{
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return ::boost::process::detail::api::is_stream_handle(handle);
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}
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/** \overload bool is_stream_handle(native_handle_type handle) */
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inline bool is_stream_handle(native_handle_type handle, std::error_code &ec)
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{
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return ::boost::process::detail::api::is_stream_handle(handle, ec);
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}
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}
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namespace process
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{
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namespace detail
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{
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using limit_handles_ = ::boost::process::detail::api::limit_handles_;
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}
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/**
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* The limit_handles property sets all properties to be inherited only expcitly. It closes all unused file-descriptors on posix after the fork and
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* removes the inherit flags on windows.
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*
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* \note This is executed after the fork on posix.
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*
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* \code{.cpp}
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* system("gcc", limit_handles);
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* \endcode
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*
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* Since limit also closes the standard handles unless they are explicitly redirected they can be ignored by `limit_handles` in the following way.
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*
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* \code{.cpp}
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* system("gcc", limit_handles.allowStd())
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* \endcode
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*
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*/
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const static ::boost::process::detail::api::limit_handles_ limit_handles;
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}
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}
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#endif //BOOST_PROCESS_HANDLES_HPP_
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