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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* 24 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 25 * Use is subject to license terms. 26 */ 27 28 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 29 /* All Rights Reserved */ 30 31 #pragma ident "%Z%%M% %I% %E% SMI" 32 33 #include "synonyms.h" 34 #include <sys/types.h> 35 #include <sys/ucontext.h> 36 #include <signal.h> 37 #include <errno.h> 38 39 int 40 sigstack(struct sigstack *nss, struct sigstack *oss) 41 { 42 struct sigaltstack nalt; 43 struct sigaltstack oalt; 44 struct sigaltstack *naltp; 45 46 if (nss) { 47 /* Assumes stack growth is down */ 48 nalt.ss_sp = (char *)nss->ss_sp - SIGSTKSZ; 49 nalt.ss_size = SIGSTKSZ; 50 nalt.ss_flags = 0; 51 naltp = &nalt; 52 } else 53 naltp = (struct sigaltstack *)0; 54 55 if (sigaltstack(naltp, &oalt) < 0) 56 return (-1); 57 58 if (oss) { 59 /* Assumes stack growth is down */ 60 oss->ss_sp = (char *)oalt.ss_sp + oalt.ss_size; 61 oss->ss_onstack = ((oalt.ss_flags & SS_ONSTACK) != 0); 62 } 63 return (0); 64 } 65