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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
#pragma ident "%Z%%M% %I% %E% SMI"
#pragma weak sigstack = _sigstack
#include "lint.h"
#include <sys/types.h>
#include <sys/ucontext.h>
#include <signal.h>
#include <errno.h>
int
_sigstack(struct sigstack *nss, struct sigstack *oss)
{
struct sigaltstack nalt;
struct sigaltstack oalt;
struct sigaltstack *naltp;
if (nss) {
/* Assumes stack growth is down */
nalt.ss_sp = (char *)nss->ss_sp - SIGSTKSZ;
nalt.ss_size = SIGSTKSZ;
nalt.ss_flags = 0;
naltp = &nalt;
} else
naltp = (struct sigaltstack *)0;
if (sigaltstack(naltp, &oalt) < 0)
return (-1);
if (oss) {
/* Assumes stack growth is down */
oss->ss_sp = (char *)oalt.ss_sp + oalt.ss_size;
oss->ss_onstack = ((oalt.ss_flags & SS_ONSTACK) != 0);
}
return (0);
}
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