/*- * Copyright (c) 2011 David Chisnall * Copyright (c) 2015 embedded brains GmbH * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #include <stdlib.h>#include <unistd.h>#include <sys/lock.h> /** * Linked list of quick exit handlers.  This is simpler than the atexit() * version, because it is not required to support C++ destructors or * DSO-specific cleanups. */struct quick_exit_handler {	struct quick_exit_handler *next;	void (*cleanup)(void);}; /** * Lock protecting the handlers list. */#ifndef __SINGLE_THREAD____LOCK_INIT(static, __at_quick_exit_mutex);#endif/** * Stack of cleanup handlers.  These will be invoked in reverse order when */static struct quick_exit_handler *handlers; intat_quick_exit(void (*func)(void)){	struct quick_exit_handler *h; 	h = malloc(sizeof(*h)); 	if (NULL == h)		return (1);	h->cleanup = func;#ifndef __SINGLE_THREAD__	__lock_acquire(__at_quick_exit_mutex);#endif	h->next = handlers;	handlers = h;#ifndef __SINGLE_THREAD__	__lock_release(__at_quick_exit_mutex);#endif	return (0);} voidquick_exit(int status){	struct quick_exit_handler *h; 	/*	 * XXX: The C++ spec requires us to call std::terminate if there is an	 * exception here.	 */	for (h = handlers; NULL != h; h = h->next)		h->cleanup();	_exit(status);}