support/ignore_stderr.c

   1 /* Avoid all the buffer overflow messages on stderr.
   2    Copyright (C) 2015-2019 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <support/support.h>
  20
  21 #include <fcntl.h>
  22 #include <paths.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25
  26 void
  27 ignore_stderr (void)
  28 {
  29   int fd = open (_PATH_DEVNULL, O_WRONLY);
  30   if (fd == -1)
  31     close (STDERR_FILENO);
  32   else
  33     {
  34       dup2 (fd, STDERR_FILENO);
  35       close (fd);
  36     }
  37   setenv ("LIBC_FATAL_STDERR_", "1", 1);
  38 }