lib/dup-safer.c

   1 /* Invoke dup, but avoid some glitches.
   2
   3    Copyright (C) 2001, 2004-2006, 2009-2024 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 }