stdlib/atexit.c

   1 /* Copyright (C) 1991, 1996, 1999, 2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <stdlib.h>
  20 #include "exit.h"
  21
  22
  23 /* This is defined by newer gcc version unique for each module.  */
  24 extern void *__dso_handle __attribute__ ((__weak__));
  25
  26
  27 /* Register FUNC to be executed by `exit'.  */
  28 int
  29 atexit (void (*func) (void))
  30 {
  31   return __cxa_atexit ((void (*) (void *)) func, NULL,
  32                        &__dso_handle == NULL ? NULL : __dso_handle);
  33 }
  34
  35 /* Hide the symbol so that no definition but the one locally in the
  36    executable or DSO is used.  */
  37 #ifdef HAVE_DOT_HIDDEN
  38 asm (".hidden\tatexit");
  39 #endif