1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char *rcsid = "$OpenBSD: exit.c,v 1.8 2002/09/14 22:03:14 dhartmei Exp $"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/types.h> 39 #include <sys/mman.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 #include "atexit.h" 43 #include "thread_private.h" 44 45 /* 46 * This variable is zero until a process has created a thread. 47 * It is used to avoid calling locking functions in libc when they 48 * are not required. By default, libc is intended to be(come) 49 * thread-safe, but without a (significant) penalty to non-threaded 50 * processes. 51 */ 52 int __isthreaded = 0; 53 54 /* 55 * Exit, flushing stdio buffers if necessary. 56 */ 57 void 58 exit(status) 59 int status; 60 { 61 register struct atexit *p, *q; 62 register int n, pgsize = getpagesize(); 63 64 if (!__atexit_invalid) { 65 p = __atexit; 66 while (p != NULL) { 67 for (n = p->ind; --n >= 0;) 68 if (p->fns[n] != NULL) 69 (*p->fns[n])(); 70 q = p; 71 p = p->next; 72 munmap(q, pgsize); 73 } 74 } 75 /* cleanup, if registered, was called through fns[0] in the last page */ 76 _exit(status); 77 } 78