1/* Copyright (C) 1999-2020 Free Software Foundation, Inc.
2
3   NOTE: This source is derived from an old version taken from the GNU C
4   Library (glibc).
5
6This file is part of GCC.
7
8GCC is free software; you can redistribute it and/or modify it under
9the terms of the GNU General Public License as published by the Free
10Software Foundation; either version 3, or (at your option) any later
11version.
12
13GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14WARRANTY; without even the implied warranty of MERCHANTABILITY or
15FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16for more details.
17
18Under Section 7 of GPL version 3, you are granted additional
19permissions described in the GCC Runtime Library Exception, version
203.1, as published by the Free Software Foundation.
21
22You should have received a copy of the GNU General Public License and
23a copy of the GCC Runtime Library Exception along with this program;
24see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
25<http://www.gnu.org/licenses/>.  */
26
27#include <stdlib.h>
28#include "exit.h"
29
30#define atomic_write_barrier() __asm__ ("eieio" ::: "memory")
31
32/* Register a function to be called by exit.  */
33int
34on_exit (void (*func) (int status, void *arg), void *arg)
35{
36  struct exit_function *new = __new_exitfn (&__exit_funcs);
37
38  if (new == NULL)
39    return -1;
40
41#ifdef PTR_MANGLE
42  PTR_MANGLE (func);
43#endif
44  new->func.on.fn = func;
45  new->func.on.arg = arg;
46  atomic_write_barrier ();
47  new->flavor = ef_on;
48  return 0;
49}
50