detail/posix/null_in.hpp

0001 // Copyright (c) 2006, 2007 Julio M. Merino Vidal
0002 // Copyright (c) 2008 Ilya Sokolov, Boris Schaeling
0003 // Copyright (c) 2009 Boris Schaeling
0004 // Copyright (c) 2010 Felipe Tanus, Boris Schaeling
0005 // Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling
0006 //
0007 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0008 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0009
0010 #ifndef BOOST_PROCESS_DETAIL_POSIX_NULL_IN_HPP
0011 #define BOOST_PROCESS_DETAIL_POSIX_NULL_IN_HPP
0012
0013 #include <boost/process/pipe.hpp>
0014 #include <boost/process/detail/posix/handler.hpp>
0015 #include <boost/process/detail/posix/file_descriptor.hpp>
0016 #include <unistd.h>
0017 #include <boost/process/detail/used_handles.hpp>
0018 #include <array>
0019
0020 namespace boost { namespace process { namespace detail { namespace posix {
0021
0022 struct null_in : handler_base_ext, ::boost::process::detail::uses_handles
0023 {
0024     file_descriptor source{"/dev/null", file_descriptor::read};
0025
0026     std::array<int, 2> get_used_handles()
0027     {
0028         return {{STDIN_FILENO, source.handle()}};
0029     }
0030
0031
0032 public:
0033     template <class Executor>
0034     void on_exec_setup(Executor &e) const
0035     {
0036         if (::dup2(source.handle(), STDIN_FILENO) == -1)
0037              e.set_error(::boost::process::detail::get_last_error(), "dup2() failed");
0038     }
0039 };
0040
0041 }}}}
0042
0043 #endif