ceph/src/boost/libs/process/example/posix.cpp

   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 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9
  10 #include <boost/process.hpp>
  11 #include <boost/process/posix.hpp>
  12 #include <boost/process/extend.hpp>
  13 #include <iostream>
  14 #include <fstream>
  15 #include <unistd.h>
  16 #include <errno.h>
  17
  18 namespace bp = boost::process;
  19
  20 int main()
  21 {
  22
  23     //duplicate our pipe descriptor into literal position 4
  24     bp::pipe p;
  25     bp::system("test", bp::posix::fd.bind(4, p.native_sink()));
  26
  27
  28     //close file-descriptor from explicit integral value
  29     bp::system("test", bp::posix::fd.close(STDIN_FILENO));
  30
  31     //close file-descriptors from explicit integral values
  32     bp::system("test", bp::posix::fd.close({STDIN_FILENO, STDOUT_FILENO}));
  33
  34     //add custom handlers
  35     const char *env[2] = { 0 };
  36     env[0] = "LANG=de";
  37     bp::system("test",
  38         bp::extend::on_setup([env](auto &e) { e.env = const_cast<char**>(env); }),
  39         bp::extend::on_fork_error([](auto&, const std::error_code & ec)
  40             { std::cerr << errno << std::endl; }),
  41         bp::extend::on_exec_setup([](auto&)
  42             { ::chroot("/new/root/directory/"); }),
  43         bp::extend::on_exec_error([](auto&, const std::error_code & ec)
  44             { std::ofstream ofs("log.txt"); if (ofs) ofs << errno; })
  45     );
  46
  47 }