1 /* Copyright (C) 1991, 2016-2023 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 Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 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 Library General Public License for more details.
13
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
18
19 #include <ansidecl.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <unistd.h>
23 #include "exit.h"
24
25 #ifdef HAVE_GNU_LD
26 CONST struct
27 {
28 size_t n;
29 void EXFUN((*fn[1]), (NOARGS));
30 } __libc_atexit;
31 #endif
32
33 /* Call all functions registered with `atexit' and `on_exit',
34 in the reverse of the order in which they were registered
35 perform stdio cleanup, and terminate program execution with STATUS. */
36 __NORETURN
37 void
38 DEFUN(exit, (status), int status)
39 {
40 register CONST struct exit_function_list *l;
41
42 for (l = __exit_funcs; l != NULL; l = l->next)
43 {
44 register size_t i = l->idx;
45 while (i-- > 0)
46 {
47 CONST struct exit_function *CONST f = &l->fns[i];
48 switch (f->flavor)
49 {
50 case ef_free:
51 break;
52 case ef_on:
53 (*f->func.on.fn)(status, f->func.on.arg);
54 break;
55 case ef_at:
56 (*f->func.at)();
57 break;
58 }
59 }
60 }
61
62 #ifdef HAVE_GNU_LD
63 {
64 void EXFUN((*CONST *fn), (NOARGS));
65 for (fn = __libc_atexit.fn; *fn != NULL; ++fn)
66 (**fn) ();
67 }
68 #else
69 {
70 extern void EXFUN(_cleanup, (NOARGS));
71 _cleanup();
72 }
73 #endif
74
75 _exit(status);
76 }
77