exit.c revision 92986 
1/*-
2 * Copyright (c) 1990, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)exit.c	8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/stdlib/exit.c 92986 2002-03-22 21:53:29Z obrien $");
39
40#include "namespace.h"
41#include <stdlib.h>
42#include <unistd.h>
43#include "un-namespace.h"
44#include "atexit.h"
45
46void (*__cleanup)();
47
48/*
49 * This variable is zero until a process has created a thread.
50 * It is used to avoid calling locking functions in libc when they
51 * are not required. By default, libc is intended to be(come)
52 * thread-safe, but without a (significant) penalty to non-threaded
53 * processes.
54 */
55int	__isthreaded	= 0;
56
57/*
58 * Exit, flushing stdio buffers if necessary.
59 */
60void
61exit(status)
62	int status;
63{
64	struct atexit *p;
65	int n;
66
67	/* Ensure that the auto-initialization routine is linked in: */
68	extern int _thread_autoinit_dummy_decl;
69
70	_thread_autoinit_dummy_decl = 1;
71
72	for (p = __atexit; p; p = p->next)
73		for (n = p->ind; --n >= 0;)
74			(*p->fns[n])();
75	if (__cleanup)
76		(*__cleanup)();
77	_exit(status);
78}
79