text: /* Invoke pipe2, but avoid some glitches.
     Copyright (C) 2005-2006, 2009-2014 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  /* Written by Eric Blake.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "unistd-safer.h"
  
  #include <unistd.h>
  #include <errno.h>
  
  /* Like pipe2, but ensure that neither of the file descriptors is
     STDIN_FILENO, STDOUT_FILENO, or STDERR_FILENO.  */
  
  int
  pipe2_safer (int fd[2], int flags)
  {
    /* This is a generalization of the pipe_safer implementation.  */
    if (pipe2 (fd, flags) == 0)
      {
        int i;
        for (i = 0; i < 2; i++)
          {
            fd[i] = fd_safer_flag (fd[i], flags);
            if (fd[i] < 0)
              {
                int e = errno;
                close (fd[1 - i]);
                errno = e;
                return -1;
              }
          }
  
        return 0;
      }
    return -1;
  }
  