1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. 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 * @(#)exit.c 8.1 (Berkeley) 6/4/93 30 * $FreeBSD: src/lib/libc/stdlib/exit.c,v 1.9 2007/01/09 00:28:09 imp Exp $ 31 */ 32 33 #include "namespace.h" 34 #include <sys/single_threaded.h> 35 #include <stdlib.h> 36 #include <unistd.h> 37 #include "un-namespace.h" 38 39 #include "atexit.h" 40 #include "libc_private.h" 41 42 void (*__cleanup)(void); 43 44 /* 45 * Publicly exported __isthreaded inverted sticky version for use in 46 * third-party libraries to optimize non-threaded programs. 47 */ 48 char __libc_single_threaded = 1; 49 50 /* 51 * This variable is zero until a process has created a thread. 52 * It is used to avoid calling locking functions in libc when they 53 * are not required. By default, libc is intended to be(come) 54 * thread-safe, but without a (significant) penalty to non-threaded 55 * processes. 56 */ 57 int __isthreaded = 0; 58 59 /* 60 * Allows code to test if the whole process is exiting, to avoid 61 * unnecessary overhead such as freeing zones in nmalloc. 62 */ 63 int __isexiting = 0; 64 65 /* 66 * Exit, flushing stdio buffers if necessary. 67 */ 68 void 69 exit(int status) 70 { 71 /* Ensure that the auto-initialization routine is linked in: */ 72 extern int _thread_autoinit_dummy_decl; 73 74 __isexiting = 1; 75 _thread_autoinit_dummy_decl = 1; 76 77 /* Call TLS destructors, if any. */ 78 _thread_finalize(); 79 __cxa_finalize(NULL); 80 if (__cleanup) 81 (*__cleanup)(); 82 _exit(status); 83 } 84 85 /* 86 * ISO C99 added the _Exit() function that results in immediate program 87 * termination without triggering signals or atexit()-registered functions. 88 * In POSIX this is equivalent to the _exit() function. 89 */ 90 void 91 _Exit(int status) 92 { 93 _exit(status); 94 } 95