1/*	$NetBSD$	*/
2
3/*-
4 * Copyright (c) 2011 David Chisnall
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: src/lib/libc/stdlib/quick_exit.c,v 1.4 2012/11/17 01:49:41 svnexp Exp $
29 */
30#include <sys/cdefs.h>
31__RCSID("$NetBSD$");
32
33#include "namespace.h"
34#include "reentrant.h"
35
36#include <stdlib.h>
37
38/**
39 * Linked list of quick exit handlers.  This is simpler than the atexit()
40 * version, because it is not required to support C++ destructors or
41 * DSO-specific cleanups.
42 */
43struct quick_exit_handler {
44	struct quick_exit_handler *next;
45	void (*cleanup)(void);
46};
47
48/**
49 * Lock protecting the handlers list.
50 */
51#ifdef _REENTRANT
52extern mutex_t __atexit_mutex;
53#endif
54
55/**
56 * Stack of cleanup handlers.  These will be invoked in reverse order when
57 */
58static struct quick_exit_handler *handlers;
59
60int
61at_quick_exit(void (*func)(void))
62{
63	struct quick_exit_handler *h;
64
65	h = malloc(sizeof(*h));
66
67	if (NULL == h)
68		return 1;
69	h->cleanup = func;
70#ifdef _REENTRANT
71	mutex_lock(&__atexit_mutex);
72#endif
73	h->next = handlers;
74	handlers = h;
75#ifdef _REENTRANT
76	mutex_unlock(&__atexit_mutex);
77#endif
78	return 0;
79}
80
81void
82quick_exit(int status)
83{
84	struct quick_exit_handler *h;
85
86	/*
87	 * XXX: The C++ spec requires us to call std::terminate if there is an
88	 * exception here.
89	 */
90	for (h = handlers; NULL != h; h = h->next)
91		(*h->cleanup)();
92	_Exit(status);
93}
94