stdio-common/fcloseall.c

   1 /* Close all streams but make sure this isn't done more than once.
   2    This function is called in abort().
   3    Copyright (C) 1996 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include <libc-lock.h>
  23 #include <stdio.h>
  24
  25 static int already_called;
  26
  27 __libc_lock_define_initialized (static, lock);
  28
  29 void
  30 __close_all_streams (void)
  31 {
  32   /* We must be prepared for multi-threading on multiple calls.  */
  33   if (! __libc_lock_trylock (lock) && ! already_called)
  34     {
  35       /* Signal that we already did this.  */
  36       already_called = 1;
  37
  38       /* Do the real work.  */
  39       fclose (NULL);
  40
  41       /* We don't release the lock so that the `trylock' immediately
  42          fails.  */
  43     }
  44 }