1  /* Avoid all the buffer overflow messages on stderr.
       2     Copyright (C) 2015-2023 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  }