Home | History | Annotate | Line # | Download | only in stdlib 
      1 /*	$NetBSD: quick_exit.c,v 1.1 2013/04/26 18:29:55 christos Exp $	*/
      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: quick_exit.c,v 1.1 2013/04/26 18:29:55 christos Exp $");
     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  */
     43 struct 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
     52 extern mutex_t __atexit_mutex;
     53 #endif
     54 
     55 /**
     56  * Stack of cleanup handlers.  These will be invoked in reverse order when
     57  */
     58 static struct quick_exit_handler *handlers;
     59 
     60 int
     61 at_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 
     81 void
     82 quick_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