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