1 /*-
2 * Copyright (c) 2011 David Chisnall
3 * Copyright (c) 2015 embedded brains GmbH
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 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD$
28 */
29
30 #include <stdlib.h>
31 #include <unistd.h>
32 #include <sys/lock.h>
33
34 /**
35 * Linked list of quick exit handlers. This is simpler than the atexit()
36 * version, because it is not required to support C++ destructors or
37 * DSO-specific cleanups.
38 */
39 struct quick_exit_handler {
40 struct quick_exit_handler *next;
41 void (*cleanup)(void);
42 };
43
44 /**
45 * Stack of cleanup handlers. These will be invoked in reverse order when
46 */
47 static struct quick_exit_handler *handlers;
48
49 int
at_quick_exit(void (* func)(void))50 at_quick_exit(void (*func)(void))
51 {
52 struct quick_exit_handler *h;
53
54 h = malloc(sizeof(*h));
55
56 if (NULL == h)
57 return (1);
58 h->cleanup = func;
59 __LIBC_LOCK();
60 h->next = handlers;
61 handlers = h;
62 __LIBC_UNLOCK();
63 return (0);
64 }
65
66 void
quick_exit(int status)67 quick_exit(int status)
68 {
69 struct quick_exit_handler *h;
70
71 /*
72 * XXX: The C++ spec requires us to call std::terminate if there is an
73 * exception here.
74 */
75 for (h = handlers; NULL != h; h = h->next)
76 h->cleanup();
77 _exit(status);
78 }
79
