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[glibc.git] / stdlib / exit.c
blobac247a1233c8b373e97fe90cd3a3b2c2b615da48
1 /* Copyright (C) 1991,95,96,97,99,2001,02 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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. */
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <unistd.h>
22 #include "exit.h"
24 #ifdef HAVE_GNU_LD
25 #include "set-hooks.h"
26 DEFINE_HOOK (__libc_atexit, (void))
27 #endif
30 /* Call all functions registered with `atexit' and `on_exit',
31 in the reverse of the order in which they were registered
32 perform stdio cleanup, and terminate program execution with STATUS. */
33 void
34 exit (int status)
36 /* We do it this way to handle recursive calls to exit () made by
37 the functions registered with `atexit' and `on_exit'. We call
38 everyone on the list and use the status value in the last
39 exit (). */
40 while (__exit_funcs != NULL)
42 struct exit_function_list *old;
44 while (__exit_funcs->idx > 0)
46 const struct exit_function *const f =
47 &__exit_funcs->fns[--__exit_funcs->idx];
48 switch (f->flavor)
50 case ef_free:
51 case ef_us:
52 break;
53 case ef_on:
54 (*f->func.on.fn) (status, f->func.on.arg);
55 break;
56 case ef_at:
57 (*f->func.at) ();
58 break;
59 case ef_cxa:
60 (*f->func.cxa.fn) (f->func.cxa.arg, status);
61 break;
65 old = __exit_funcs;
66 __exit_funcs = __exit_funcs->next;
67 if (__exit_funcs != NULL)
68 /* Don't free the last element in the chain, this is the statically
69 allocate element. */
70 free (old);
73 #ifdef HAVE_GNU_LD
74 RUN_HOOK (__libc_atexit, ());
75 #else
77 extern void _cleanup (void);
78 _cleanup ();
80 #endif
82 _exit (status);
84 libc_hidden_def (exit)