glibc/stdlib/atexit.c

/* Copyright (C) 1991, 1996, 1999, 2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <stdlib.h>
#include "exit.h"


/* This is defined by newer gcc version unique for each module.  */
extern void *__dso_handle __attribute__ ((__weak__));


/* Register FUNC to be executed by `exit'.  */
int
atexit (void (*func) (void))
{
  return __cxa_atexit ((void (*) (void *)) func, NULL,
		       &__dso_handle == NULL ? NULL : __dso_handle);
}

/* Hide the symbol so that no definition but the one locally in the
   executable or DSO is used.  */
#ifdef HAVE_DOT_HIDDEN
asm (".hidden\tatexit");
#endif