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 * Copyright 2004 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 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include <sys/param.h> 33 #include <sys/types.h> 34 #include <sys/sysmacros.h> 35 #include <sys/systm.h> 36 #include <sys/errno.h> 37 #include <sys/proc.h> 38 #include <sys/fault.h> 39 #include <sys/signal.h> 40 #include <sys/siginfo.h> 41 #include <sys/debug.h> 42 43 int 44 sigaltstack(struct sigaltstack *ssp, struct sigaltstack *oss) 45 { 46 klwp_t *lwp = ttolwp(curthread); 47 struct sigaltstack ss; 48 49 /* 50 * User's oss and ss might be the same address, so copyin first and 51 * save before copying out. 52 */ 53 if (ssp) { 54 if (lwp->lwp_sigaltstack.ss_flags & SS_ONSTACK) 55 return (set_errno(EPERM)); 56 if (copyin(ssp, &ss, sizeof (ss))) 57 return (set_errno(EFAULT)); 58 if (ss.ss_flags & ~SS_DISABLE) 59 return (set_errno(EINVAL)); 60 if (!(ss.ss_flags & SS_DISABLE) && ss.ss_size < MINSIGSTKSZ) 61 return (set_errno(ENOMEM)); 62 } 63 64 if (oss) { 65 if (copyout(&lwp->lwp_sigaltstack, 66 oss, sizeof (struct sigaltstack))) 67 return (set_errno(EFAULT)); 68 } 69 70 if (ssp) 71 lwp->lwp_sigaltstack = ss; 72 73 return (0); 74 } 75 76 #ifdef _LP64 77 int 78 sigaltstack32(struct sigaltstack32 *ssp, struct sigaltstack32 *oss) 79 { 80 klwp_t *lwp = ttolwp(curthread); 81 struct sigaltstack *ss; 82 struct sigaltstack32 ss32, oss32; 83 84 /* 85 * User's oss and ss might be the same address, so copyin first and 86 * save before copying out. 87 */ 88 if (ssp) { 89 if (lwp->lwp_sigaltstack.ss_flags & SS_ONSTACK) 90 return (set_errno(EPERM)); 91 if (copyin(ssp, &ss32, sizeof (ss32))) 92 return (set_errno(EFAULT)); 93 if (ss32.ss_flags & ~SS_DISABLE) 94 return (set_errno(EINVAL)); 95 if (!(ss32.ss_flags & SS_DISABLE) && ss32.ss_size < MINSIGSTKSZ) 96 return (set_errno(ENOMEM)); 97 } 98 99 if (oss) { 100 /* 101 * copy to ILP32 struct before copyout. 102 */ 103 ss = &lwp->lwp_sigaltstack; 104 oss32.ss_sp = (caddr32_t)(uintptr_t)ss->ss_sp; 105 oss32.ss_size = (size32_t)ss->ss_size; 106 oss32.ss_flags = ss->ss_flags; 107 108 if (copyout(&oss32, oss, sizeof (oss32))) 109 return (set_errno(EFAULT)); 110 } 111 112 if (ssp) { 113 ss = &lwp->lwp_sigaltstack; 114 ss->ss_sp = (void *)(uintptr_t)ss32.ss_sp; 115 ss->ss_size = (size_t)ss32.ss_size; 116 ss->ss_flags = ss32.ss_flags; 117 } 118 119 return (0); 120 } 121 #endif /* _LP64 */ 122