exit.c revision a27d2baa0c1a2ec70f47ea9199b1dd6762c8a349 
1/*	$OpenBSD: exit.c,v 1.11 2005/08/08 08:05:36 espie Exp $ */
2/*-
3 * Copyright (c) 1990 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/types.h>
32#include <sys/mman.h>
33#include <stdlib.h>
34#include <unistd.h>
35#include "atexit.h"
36#include "thread_private.h"
37
38/*
39 * This variable is zero until a process has created a thread.
40 * It is used to avoid calling locking functions in libc when they
41 * are not required. By default, libc is intended to be(come)
42 * thread-safe, but without a (significant) penalty to non-threaded
43 * processes.
44 */
45int     __isthreaded    = 0;
46
47/*
48 * Exit, flushing stdio buffers if necessary.
49 */
50void
51exit(int status)
52{
53	struct atexit *p, *q;
54	int n, pgsize = getpagesize();
55
56	if (!__atexit_invalid) {
57		p = __atexit;
58		while (p != NULL) {
59			for (n = p->ind; --n >= 0;)
60				if (p->fns[n] != NULL)
61					(*p->fns[n])();
62			q = p;
63			p = p->next;
64			munmap(q, pgsize);
65  }
66	}
67	/* cleanup, if registered, was called through fns[0] in the last page */
68	_exit(status);
69}
70