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 */
37 struct quick_exit_handler {
38 struct quick_exit_handler *next;
39 void (*cleanup)(void);
40 };
41
42 /**
43 * Lock protecting the handlers list.
44 */
45 static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER;
46 /**
47 * Stack of cleanup handlers. These will be invoked in reverse order when
48 */
49 static struct quick_exit_handler *handlers;
50
51 int
at_quick_exit(void (* func)(void))52 at_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
68 void
quick_exit(int status)69 quick_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