ceph/src/boost/boost/process/detail/posix/file_out.hpp

   1 // Copyright (c) 2006, 2007 Julio M. Merino Vidal
   2 // Copyright (c) 2008 Ilya Sokolov, Boris Schaeling
   3 // Copyright (c) 2009 Boris Schaeling
   4 // Copyright (c) 2010 Felipe Tanus, Boris Schaeling
   5 // Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling
   6 // Copyright (c) 2016 Klemens D. Morgenstern
   7 //
   8 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   9 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  10
  11 #ifndef BOOST_PROCESS_POSIX_FILE_OUT_HPP
  12 #define BOOST_PROCESS_POSIX_FILE_OUT_HPP
  13
  14 #include <boost/process/detail/posix/handler.hpp>
  15 #include <boost/process/detail/posix/file_descriptor.hpp>
  16 #include <boost/process/detail/used_handles.hpp>
  17 #include <unistd.h>
  18
  19 namespace boost { namespace process { namespace detail { namespace posix {
  20
  21 template<int p1, int p2>
  22 struct file_out : handler_base_ext, ::boost::process::detail::uses_handles
  23 {
  24     file_descriptor file;
  25     int handle = file.handle();
  26
  27     template<typename T>
  28     file_out(T&& t) : file(std::forward<T>(t), file_descriptor::write), handle(file.handle()) {}
  29     file_out(FILE * f) : handle(fileno(f)) {}
  30
  31     std::array<int, 3> get_used_handles()
  32     {
  33         const auto pp1 = p1 != -1 ? p1 : p2;
  34         const auto pp2 = p2 != -1 ? p2 : p1;
  35
  36         return {handle, pp1, pp2};
  37     }
  38
  39     template <typename Executor>
  40     void on_exec_setup(Executor &e) const;
  41 };
  42
  43 template<>
  44 template<typename Executor>
  45 void file_out<1,-1>::on_exec_setup(Executor &e) const
  46 {
  47     if (::dup2(handle, STDOUT_FILENO) == -1)
  48          e.set_error(::boost::process::detail::get_last_error(), "dup2() failed");
  49 }
  50
  51 template<>
  52 template<typename Executor>
  53 void file_out<2,-1>::on_exec_setup(Executor &e) const
  54 {
  55     if (::dup2(handle, STDERR_FILENO) == -1)
  56          e.set_error(::boost::process::detail::get_last_error(), "dup2() failed");
  57 }
  58
  59 template<>
  60 template<typename Executor>
  61 void file_out<1,2>::on_exec_setup(Executor &e) const
  62 {
  63     if (::dup2(handle, STDOUT_FILENO) == -1)
  64          e.set_error(::boost::process::detail::get_last_error(), "dup2() failed");
  65
  66     if (::dup2(handle, STDERR_FILENO) == -1)
  67          e.set_error(::boost::process::detail::get_last_error(), "dup2() failed");
  68
  69 }
  70
  71 }}}}
  72
  73 #endif