getcontextx.c revision 230429 
1/*
2 * Copyright (c) 2011 Konstantin Belousov <kib@FreeBSD.org>
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 *
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 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/lib/libc/sparc64/gen/getcontextx.c 230429 2012-01-21 18:00:28Z kib $");
29
30#include <sys/types.h>
31#include <sys/ucontext.h>
32#include <errno.h>
33#include <stdlib.h>
34
35size_t
36__getcontextx_size(void)
37{
38
39	return (sizeof(ucontext_t));
40}
41
42int
43__fillcontextx(char *ctx)
44{
45	ucontext_t *ucp;
46
47	ucp = (ucontext_t *)ctx;
48	return (getcontext(ucp));
49}
50
51__weak_reference(__getcontextx, getcontextx);
52
53ucontext_t *
54__getcontextx(void)
55{
56	char *ctx;
57	int error;
58
59	ctx = malloc(__getcontextx_size());
60	if (ctx == NULL)
61		return (NULL);
62	if (__fillcontextx(ctx) == -1) {
63		error = errno;
64		free(ctx);
65		errno = error;
66		return (NULL);
67	}
68	return ((ucontext_t *)ctx);
69}
70