stdlib/on_exit.c

   1 /* Copyright (C) 1991, 1996, 2005 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 #include <atomic.h>
  22 #include <sysdep.h>
  23
  24 /* Register a function to be called by exit.  */
  25 int
  26 __on_exit (void (*func) (int status, void *arg), void *arg)
  27 {
  28   struct exit_function *new = __new_exitfn ();
  29
  30   if (new == NULL)
  31     return -1;
  32
  33 #ifdef PTR_MANGLE
  34   PTR_MANGLE (func);
  35 #endif
  36   new->func.on.fn = func;
  37   new->func.on.arg = arg;
  38   atomic_write_barrier ();
  39   new->flavor = ef_on;
  40   return 0;
  41 }
  42 weak_alias (__on_exit, on_exit)