1/*-
2 * Copyright (c) 2011 David Chisnall
3 * 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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29#include <stdlib.h>
30#include <pthread.h>
31
32/**
33 * Linked list of quick exit handlers.  This is simpler than the atexit()
34 * version, because it is not required to support C++ destructors or
35 * DSO-specific cleanups.
36 */
37struct quick_exit_handler {
38	struct quick_exit_handler *next;
39	void (*cleanup)(void);
40};
41
42/**
43 * Lock protecting the handlers list.
44 */
45static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER;
46/**
47 * Stack of cleanup handlers.  These will be invoked in reverse order when
48 */
49static struct quick_exit_handler *handlers;
50
51int
52at_quick_exit(void (*func)(void))
53{
54	struct quick_exit_handler *h;
55
56	h = malloc(sizeof(*h));
57
58	if (NULL == h)
59		return (1);
60	h->cleanup = func;
61	pthread_mutex_lock(&atexit_mutex);
62	h->next = handlers;
63	handlers = h;
64	pthread_mutex_unlock(&atexit_mutex);
65	return (0);
66}
67
68void
69quick_exit(int status)
70{
71	struct quick_exit_handler *h;
72
73	/*
74	 * XXX: The C++ spec requires us to call std::terminate if there is an
75	 * exception here.
76	 */
77	for (h = handlers; NULL != h; h = h->next)
78		h->cleanup();
79	_Exit(status);
80}
81