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