quick_exit.c revision 228322 
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: head/lib/libc/stdlib/quick_exit.c 228322 2011-12-07 15:25:48Z theraven $
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__attribute((weak))
43void _ZSt9terminatev(void);
44
45/**
46 * Lock protecting the handlers list.
47 */
48static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER;
49/**
50 * Stack of cleanup handlers.  These will be invoked in reverse order when
51 */
52static struct quick_exit_handler *handlers;
53
54int
55at_quick_exit(void (*func)(void))
56{
57	struct quick_exit_handler *h = malloc(sizeof(struct quick_exit_handler));
58
59	if (0 == h) {
60		return 1;
61	}
62	h->cleanup = func;
63	pthread_mutex_lock(&atexit_mutex);
64	h->next = handlers;
65	handlers = h;
66	pthread_mutex_unlock(&atexit_mutex);
67	return 0;
68}
69
70void quick_exit(int status)
71{
72	/*
73	 * XXX: The C++ spec requires us to call std::terminate if there is an
74	 * exception here.
75	 */
76	for (struct quick_exit_handler *h = handlers ; NULL != h ; h = h->next)
77	{
78		h->cleanup();
79	}
80	_Exit(status);
81}
82