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 2006 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 #pragma weak sigstack = _sigstack 33 34 #include "synonyms.h" 35 #include <sys/types.h> 36 #include <sys/ucontext.h> 37 #include <signal.h> 38 #include <errno.h> 39 40 int 41 sigstack(struct sigstack *nss, struct sigstack *oss) 42 { 43 struct sigaltstack nalt; 44 struct sigaltstack oalt; 45 struct sigaltstack *naltp; 46 47 if (nss) { 48 /* Assumes stack growth is down */ 49 nalt.ss_sp = (char *)nss->ss_sp - SIGSTKSZ; 50 nalt.ss_size = SIGSTKSZ; 51 nalt.ss_flags = 0; 52 naltp = &nalt; 53 } else 54 naltp = (struct sigaltstack *)0; 55 56 if (sigaltstack(naltp, &oalt) < 0) 57 return (-1); 58 59 if (oss) { 60 /* Assumes stack growth is down */ 61 oss->ss_sp = (char *)oalt.ss_sp + oalt.ss_size; 62 oss->ss_onstack = ((oalt.ss_flags & SS_ONSTACK) != 0); 63 } 64 return (0); 65 } 66