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 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