1  /* Invoke dup, but avoid some glitches.
       2  
       3     Copyright (C) 2001, 2004-2006, 2009-2023 Free Software Foundation, Inc.
       4  
       5     This program is free software: you can redistribute it and/or modify
       6     it under the terms of the GNU General Public License as published by
       7     the Free Software Foundation, either version 3 of the License, or
       8     (at your option) any later version.
       9  
      10     This program is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      13     GNU General Public License for more details.
      14  
      15     You should have received a copy of the GNU General Public License
      16     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      17  
      18  /* Written by Paul Eggert.  */
      19  
      20  #include <config.h>
      21  
      22  #include "unistd-safer.h"
      23  
      24  #include <fcntl.h>
      25  #include <unistd.h>
      26  
      27  /* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
      28     STDERR_FILENO.  */
      29  
      30  int
      31  dup_safer (int fd)
      32  {
      33    return fcntl (fd, F_DUPFD, STDERR_FILENO + 1);
      34  }