text: // Copyright 2010 Google Inc.
  // All rights reserved.
  //
  // Redistribution and use in source and binary forms, with or without
  // modification, are permitted provided that the following conditions are
  // met:
  //
  // * Redistributions of source code must retain the above copyright
  //   notice, this list of conditions and the following disclaimer.
  // * Redistributions in binary form must reproduce the above copyright
  //   notice, this list of conditions and the following disclaimer in the
  //   documentation and/or other materials provided with the distribution.
  // * Neither the name of Google Inc. nor the names of its contributors
  //   may be used to endorse or promote products derived from this software
  //   without specific prior written permission.
  //
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #include "utils/process/system.hpp"
  
  extern "C" {
  #include <sys/wait.h>
  
  #include <fcntl.h>
  #include <unistd.h>
  }
  
  namespace detail = utils::process::detail;
  
  
  /// Indirection to execute the dup2(2) system call.
  int (*detail::syscall_dup2)(const int, const int) = ::dup2;
  
  
  /// Indirection to execute the fork(2) system call.
  pid_t (*detail::syscall_fork)(void) = ::fork;
  
  
  /// Indirection to execute the open(2) system call.
  int (*detail::syscall_open)(const char*, const int, ...) = ::open;
  
  
  /// Indirection to execute the pipe(2) system call.
  int (*detail::syscall_pipe)(int[2]) = ::pipe;
  
  
  /// Indirection to execute the waitpid(2) system call.
  pid_t (*detail::syscall_waitpid)(const pid_t, int*, const int) = ::waitpid;
  