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
exit(int status)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
_Exit(int status)91 _Exit(int status)
92 {
93 _exit(status);
94 }
95