thr_error.c revision 156611 
1/*
2 * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
3 * Copyright (c) 1994 by Chris Provenzano, proven@mit.edu
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *	This product includes software developed by John Birrell
17 *  and Chris Provenzano.
18 * 4. Neither the name of the author nor the names of any co-contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $FreeBSD: head/lib/libkse/sys/thr_error.c 156611 2006-03-13 00:59:51Z deischen $
35 */
36#include <pthread.h>
37#include "libc_private.h"
38#include "thr_private.h"
39
40#undef errno
41extern	int	errno;
42
43LT10_COMPAT_DEFAULT(__error);
44
45int *
46__error(void)
47{
48	struct pthread *curthread;
49
50	if (__isthreaded == 0)
51		return (&errno);
52	else if (_kse_in_critical())
53		return &(_get_curkse()->k_error);
54	else {
55		curthread = _get_curthread();
56		if ((curthread == NULL) || (curthread == _thr_initial))
57			return (&errno);
58		else
59			return (&curthread->error);
60	}
61}
62