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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char *rcsid = "$OpenBSD: exit.c,v 1.9 2003/06/02 20:18:37 millert Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/types.h> 35 #include <sys/mman.h> 36 #include <stdlib.h> 37 #include <unistd.h> 38 #include "atexit.h" 39 #include "thread_private.h" 40 41 /* 42 * This variable is zero until a process has created a thread. 43 * It is used to avoid calling locking functions in libc when they 44 * are not required. By default, libc is intended to be(come) 45 * thread-safe, but without a (significant) penalty to non-threaded 46 * processes. 47 */ 48 int __isthreaded = 0; 49 50 /* 51 * Exit, flushing stdio buffers if necessary. 52 */ 53 void 54 exit(status) 55 int status; 56 { 57 register struct atexit *p, *q; 58 register int n, pgsize = getpagesize(); 59 60 if (!__atexit_invalid) { 61 p = __atexit; 62 while (p != NULL) { 63 for (n = p->ind; --n >= 0;) 64 if (p->fns[n] != NULL) 65 (*p->fns[n])(); 66 q = p; 67 p = p->next; 68 munmap(q, pgsize); 69 } 70 } 71 /* cleanup, if registered, was called through fns[0] in the last page */ 72 _exit(status); 73 } 74