1 /* $OpenBSD: exit.c,v 1.11 2005/08/08 08:05:36 espie Exp $ */ 2 /*- 3 * Copyright (c) 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/types.h> 32 #include <sys/mman.h> 33 #include <stdlib.h> 34 #include <unistd.h> 35 #include "atexit.h" 36 #include "thread_private.h" 37 38 /* 39 * This variable is zero until a process has created a thread. 40 * It is used to avoid calling locking functions in libc when they 41 * are not required. By default, libc is intended to be(come) 42 * thread-safe, but without a (significant) penalty to non-threaded 43 * processes. 44 */ 45 int __isthreaded = 0; 46 47 /* 48 * Exit, flushing stdio buffers if necessary. 49 */ 50 void 51 exit(int status) 52 { 53 struct atexit *p, *q; 54 int n, pgsize = getpagesize(); 55 56 if (!__atexit_invalid) { 57 p = __atexit; 58 while (p != NULL) { 59 for (n = p->ind; --n >= 0;) 60 if (p->fns[n] != NULL) 61 (*p->fns[n])(); 62 q = p; 63 p = p->next; 64 munmap(q, pgsize); 65 } 66 } 67 /* cleanup, if registered, was called through fns[0] in the last page */ 68 _exit(status); 69 } 70