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      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 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #include "lint.h"
     33 #include <sys/types.h>
     34 #include <sys/ucontext.h>
     35 #include <signal.h>
     36 #include <errno.h>
     37 
     38 int
     39 sigstack(struct sigstack *nss, struct sigstack *oss)
     40 {
     41 	struct sigaltstack nalt;
     42 	struct sigaltstack oalt;
     43 	struct sigaltstack *naltp;
     44 
     45 	if (nss) {
     46 		/* Assumes stack growth is down */
     47 		nalt.ss_sp = (char *)nss->ss_sp - SIGSTKSZ;
     48 		nalt.ss_size = SIGSTKSZ;
     49 		nalt.ss_flags = 0;
     50 		naltp = &nalt;
     51 	} else
     52 		naltp = (struct sigaltstack *)0;
     53 
     54 	if (sigaltstack(naltp, &oalt) < 0)
     55 		return (-1);
     56 
     57 	if (oss) {
     58 		/* Assumes stack growth is down */
     59 		oss->ss_sp = (char *)oalt.ss_sp + oalt.ss_size;
     60 		oss->ss_onstack = ((oalt.ss_flags & SS_ONSTACK) != 0);
     61 	}
     62 	return (0);
     63 }
     64