exit.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#if defined(LIBC_SCCS) && !defined(lint)
33static char sccsid[] = "@(#)exit.c	8.1 (Berkeley) 6/4/93";
34#endif /* LIBC_SCCS and not lint */
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: stable/11/lib/libc/stdlib/exit.c 330897 2018-03-14 03:19:51Z eadler $");
37
38#include "namespace.h"
39#include <stdlib.h>
40#include <unistd.h>
41#include "un-namespace.h"
42
43#include "atexit.h"
44#include "libc_private.h"
45
46void (*__cleanup)(void);
47
48/*
49 * This variable is zero until a process has created a thread.
50 * It is used to avoid calling locking functions in libc when they
51 * are not required. By default, libc is intended to be(come)
52 * thread-safe, but without a (significant) penalty to non-threaded
53 * processes.
54 */
55int	__isthreaded	= 0;
56
57/*
58 * Exit, flushing stdio buffers if necessary.
59 */
60void
61exit(int status)
62{
63	/* Ensure that the auto-initialization routine is linked in: */
64	extern int _thread_autoinit_dummy_decl;
65
66	_thread_autoinit_dummy_decl = 1;
67
68	/*
69	 * We're dealing with cleaning up thread_local destructors in the case of
70	 * the process termination through main() exit.
71	 * Other cases are handled elsewhere.
72	 */
73	__cxa_thread_call_dtors();
74	__cxa_finalize(NULL);
75	if (__cleanup)
76		(*__cleanup)();
77	_exit(status);
78}
79