1b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert/*- 2b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * Copyright (c) 2011 David Chisnall 3b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * All rights reserved. 4b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * 5b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * Redistribution and use in source and binary forms, with or without 6b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * modification, are permitted provided that the following conditions 7b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * are met: 8b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * 1. Redistributions of source code must retain the above copyright 9b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * notice, this list of conditions and the following disclaimer. 10b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * 2. Redistributions in binary form must reproduce the above copyright 11b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * notice, this list of conditions and the following disclaimer in the 12b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * documentation and/or other materials provided with the distribution. 13b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * 14b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * SUCH DAMAGE. 25b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * 26b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * $FreeBSD$ 27b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert */ 28b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert 29b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert#include <stdlib.h> 30b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert#include <pthread.h> 31b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert 32b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert/** 33b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * Linked list of quick exit handlers. This is simpler than the atexit() 34b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * version, because it is not required to support C++ destructors or 35b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * DSO-specific cleanups. 36b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert */ 37b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albertstruct quick_exit_handler { 38b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert struct quick_exit_handler *next; 39b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert void (*cleanup)(void); 40b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert}; 41b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert 42b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert/** 43b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * Lock protecting the handlers list. 44b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert */ 45b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albertstatic pthread_mutex_t atexit_mutex = PTHREAD_MUTEX_INITIALIZER; 46b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert/** 47b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * Stack of cleanup handlers. These will be invoked in reverse order when 48b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert */ 49b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albertstatic struct quick_exit_handler *handlers; 50b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert 51b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albertint 52b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albertat_quick_exit(void (*func)(void)) 53b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert{ 54b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert struct quick_exit_handler *h; 55b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert 56b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert h = malloc(sizeof(*h)); 57b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert 58b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert if (NULL == h) 59b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert return (1); 60b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert h->cleanup = func; 61b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert pthread_mutex_lock(&atexit_mutex); 62b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert h->next = handlers; 63b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert handlers = h; 64b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert pthread_mutex_unlock(&atexit_mutex); 65b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert return (0); 66b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert} 67b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert 68b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albertvoid 69b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albertquick_exit(int status) 70b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert{ 71b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert struct quick_exit_handler *h; 72b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert 73b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert /* 74b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * XXX: The C++ spec requires us to call std::terminate if there is an 75b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert * exception here. 76b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert */ 77b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert for (h = handlers; NULL != h; h = h->next) 78b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert h->cleanup(); 79b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert _Exit(status); 80b8425c549a0bfe08b01b5906b95603d8523c1b16Dan Albert} 81