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glibc  2.9
on_exit.c
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00001 /* Copyright (C) 1991, 1996, 2005 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <stdlib.h>
00020 #include "exit.h"
00021 #include <atomic.h>
00022 #include <sysdep.h>
00023 
00024 /* Register a function to be called by exit.  */
00025 int
00026 __on_exit (void (*func) (int status, void *arg), void *arg)
00027 {
00028   struct exit_function *new = __new_exitfn ();
00029 
00030   if (new == NULL)
00031     return -1;
00032 
00033 #ifdef PTR_MANGLE
00034   PTR_MANGLE (func);
00035 #endif
00036   new->func.on.fn = func;
00037   new->func.on.arg = arg;
00038   atomic_write_barrier ();
00039   new->flavor = ef_on;
00040   return 0;
00041 }
00042 weak_alias (__on_exit, on_exit)