1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 * $FreeBSD$ 29 */ 30 31 #include <sys/types.h> 32 #include <machine/atomic.h> 33 #include <stdlib.h> 34 #include <pthread.h> 35 36 /** 37 * Linked list of quick exit handlers. This is simpler than the atexit() 38 * version, because it is not required to support C++ destructors or 39 * DSO-specific cleanups. 40 */ 41 struct quick_exit_handler { 42 struct quick_exit_handler *next; 43 void (*cleanup)(void); 44 }; 45 46 /** 47 * Lock protecting the handlers list. 48 */ 49 static pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER; 50 /** 51 * Stack of cleanup handlers. These will be invoked in reverse order when 52 */ 53 static struct quick_exit_handler *handlers; 54 55 int 56 at_quick_exit(void (*func)(void)) 57 { 58 struct quick_exit_handler *h; 59 60 h = malloc(sizeof(*h)); 61 62 if (NULL == h) 63 return (1); 64 h->cleanup = func; 65 pthread_mutex_lock(&atexit_mutex); 66 h->next = handlers; 67 __compiler_membar(); 68 handlers = h; 69 pthread_mutex_unlock(&atexit_mutex); 70 return (0); 71 } 72 73 void 74 quick_exit(int status) 75 { 76 struct quick_exit_handler *h; 77 78 /* 79 * XXX: The C++ spec requires us to call std::terminate if there is an 80 * exception here. 81 */ 82 for (h = handlers; NULL != h; h = h->next) { 83 __compiler_membar(); 84 h->cleanup(); 85 } 86 _Exit(status); 87 } 88