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    In addition to the permissions in the GNU Lesser General Public
  10    License, the Free Software Foundation gives you unlimited
  11    permission to link the compiled version of this file with other
  12    programs, and to distribute those programs without any restriction
  13    coming from the use of this file. (The GNU Lesser General Public
  14    License restrictions do apply in other respects; for example, they
  15    cover modification of the file, and distribution when not linked
  16    into another program.)
  17
  18    Note that people who make modified versions of this file are not
  19    obligated to grant this special exception for their modified
  20    versions; it is their choice whether to do so. The GNU Lesser
  21    General Public License gives permission to release a modified
  22    version without this exception; this exception also makes it
  23    possible to release a modified version which carries forward this
  24    exception.
  25
  26    The GNU C Library is distributed in the hope that it will be useful,
  27    but WITHOUT ANY WARRANTY; without even the implied warranty of
  28    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  29    Lesser General Public License for more details.
  30
  31    You should have received a copy of the GNU Lesser General Public
  32    License along with the GNU C Library; if not, write to the Free
  33    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  34    02111-1307 USA.  */
  35
  36 #include <stdlib.h>
  37 #include "exit.h"
  38
  39
  40 /* This is defined by newer gcc version unique for each module.  */
  41 extern void *__dso_handle __attribute__ ((__weak__));
  42
  43
  44 /* Register FUNC to be executed by `exit'.  */
  45 int
  46 atexit (void (*func) (void))
  47 {
  48   return __cxa_atexit ((void (*) (void *)) func, NULL,
  49                        &__dso_handle == NULL ? NULL : __dso_handle);
  50 }
  51
  52 /* Hide the symbol so that no definition but the one locally in the
  53    executable or DSO is used.  */
  54 #ifdef HAVE_DOT_HIDDEN
  55 asm (".hidden\tatexit");
  56 #endif