1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 #include "lint.h"
31 #include <sys/types.h>
32 #include <sys/ucontext.h>
33 #include <signal.h>
34 #include <errno.h>
35
36 int
sigstack(struct sigstack * nss,struct sigstack * oss)37 sigstack(struct sigstack *nss, struct sigstack *oss)
38 {
39 struct sigaltstack nalt;
40 struct sigaltstack oalt;
41 struct sigaltstack *naltp;
42
43 if (nss) {
44 /* Assumes stack growth is down */
45 nalt.ss_sp = (char *)nss->ss_sp - SIGSTKSZ;
46 nalt.ss_size = SIGSTKSZ;
47 nalt.ss_flags = 0;
48 naltp = &nalt;
49 } else
50 naltp = (struct sigaltstack *)0;
51
52 if (sigaltstack(naltp, &oalt) < 0)
53 return (-1);
54
55 if (oss) {
56 /* Assumes stack growth is down */
57 oss->ss_sp = (char *)oalt.ss_sp + oalt.ss_size;
58 oss->ss_onstack = ((oalt.ss_flags & SS_ONSTACK) != 0);
59 }
60 return (0);
61 }
62