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 2010 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 <sys/param.h> 31 #include <sys/types.h> 32 #include <sys/sysmacros.h> 33 #include <sys/systm.h> 34 #include <sys/user.h> 35 #include <sys/errno.h> 36 #include <sys/proc.h> 37 #include <sys/fault.h> 38 #include <sys/signal.h> 39 #include <sys/siginfo.h> 40 #include <sys/debug.h> 41 42 int 43 sigaction(int sig, struct sigaction *actp, struct sigaction *oactp) 44 { 45 struct sigaction act; 46 struct sigaction oact; 47 k_sigset_t set; 48 proc_t *p; 49 user_t *ua; 50 int sigcld_look = 0; 51 52 if (sig <= 0 || sig >= NSIG || 53 (actp != NULL && sigismember(&cantmask, sig))) 54 return (set_errno(EINVAL)); 55 56 /* 57 * act and oact might be the same address, so copyin act first. 58 */ 59 if (actp) { 60 #if defined(__sparc) 61 void (*handler)(); 62 #endif 63 if (copyin(actp, &act, sizeof (act))) 64 return (set_errno(EFAULT)); 65 #if defined(__sparc) 66 /* 67 * Check alignment of handler 68 */ 69 handler = act.sa_handler; 70 if (handler != SIG_IGN && handler != SIG_DFL && 71 ((uintptr_t)handler & 0x3) != 0) 72 return (set_errno(EINVAL)); 73 #endif 74 } 75 76 p = curproc; 77 ua = PTOU(p); 78 mutex_enter(&p->p_lock); 79 80 if (oactp) { 81 int flags; 82 void (*disp)(); 83 84 disp = ua->u_signal[sig - 1]; 85 86 flags = 0; 87 if (disp != SIG_DFL && disp != SIG_IGN) { 88 set = ua->u_sigmask[sig-1]; 89 if (sigismember(&p->p_siginfo, sig)) 90 flags |= SA_SIGINFO; 91 if (sigismember(&ua->u_sigrestart, sig)) 92 flags |= SA_RESTART; 93 if (sigismember(&ua->u_sigonstack, sig)) 94 flags |= SA_ONSTACK; 95 if (sigismember(&ua->u_sigresethand, sig)) 96 flags |= SA_RESETHAND; 97 if (sigismember(&ua->u_signodefer, sig)) 98 flags |= SA_NODEFER; 99 } else 100 sigemptyset(&set); 101 102 if (sig == SIGCLD) { 103 if (p->p_flag & SNOWAIT) 104 flags |= SA_NOCLDWAIT; 105 if (!(p->p_flag & SJCTL)) 106 flags |= SA_NOCLDSTOP; 107 } 108 109 oact.sa_handler = disp; 110 oact.sa_flags = flags; 111 sigktou(&set, &oact.sa_mask); 112 } 113 114 if (actp) { 115 if (sig == SIGCLD) 116 sigcld_look = 1; 117 sigutok(&act.sa_mask, &set); 118 setsigact(sig, act.sa_handler, &set, act.sa_flags); 119 } 120 121 mutex_exit(&p->p_lock); 122 123 if (sigcld_look) 124 sigcld_repost(); 125 126 if (oactp && 127 copyout(&oact, oactp, sizeof (oact))) 128 return (set_errno(EFAULT)); 129 130 return (0); 131 } 132 133 #ifdef _SYSCALL32_IMPL 134 135 int 136 sigaction32(int sig, struct sigaction32 *actp, struct sigaction32 *oactp) 137 { 138 struct sigaction32 act32; 139 struct sigaction32 oact32; 140 k_sigset_t set; 141 proc_t *p; 142 user_t *ua; 143 int sigcld_look = 0; 144 145 if (sig <= 0 || sig >= NSIG || 146 (actp != NULL && sigismember(&cantmask, sig))) 147 return (set_errno(EINVAL)); 148 149 /* 150 * act and oact might be the same address, so copyin act first. 151 */ 152 if (actp) { 153 #if defined(__sparc) 154 void (*handler)(); 155 #endif 156 if (copyin(actp, &act32, sizeof (act32))) 157 return (set_errno(EFAULT)); 158 #if defined(__sparc) 159 /* 160 * Check alignment of handler 161 */ 162 handler = (void (*)())(uintptr_t)act32.sa_handler; 163 if (handler != SIG_IGN && handler != SIG_DFL && 164 ((uintptr_t)handler & 0x3) != 0) 165 return (set_errno(EINVAL)); 166 #endif 167 } 168 169 p = curproc; 170 ua = PTOU(p); 171 mutex_enter(&p->p_lock); 172 173 if (oactp) { 174 int flags; 175 void (*disp)(); 176 177 disp = ua->u_signal[sig - 1]; 178 179 flags = 0; 180 if (disp != SIG_DFL && disp != SIG_IGN) { 181 set = ua->u_sigmask[sig-1]; 182 if (sigismember(&p->p_siginfo, sig)) 183 flags |= SA_SIGINFO; 184 if (sigismember(&ua->u_sigrestart, sig)) 185 flags |= SA_RESTART; 186 if (sigismember(&ua->u_sigonstack, sig)) 187 flags |= SA_ONSTACK; 188 if (sigismember(&ua->u_sigresethand, sig)) 189 flags |= SA_RESETHAND; 190 if (sigismember(&ua->u_signodefer, sig)) 191 flags |= SA_NODEFER; 192 } else 193 sigemptyset(&set); 194 195 if (sig == SIGCLD) { 196 if (p->p_flag & SNOWAIT) 197 flags |= SA_NOCLDWAIT; 198 if (!(p->p_flag & SJCTL)) 199 flags |= SA_NOCLDSTOP; 200 } 201 202 oact32.sa_handler = (caddr32_t)(uintptr_t)disp; 203 oact32.sa_flags = flags; 204 sigktou(&set, &oact32.sa_mask); 205 } 206 207 if (actp) { 208 if (sig == SIGCLD) 209 sigcld_look = 1; 210 sigutok(&act32.sa_mask, &set); 211 setsigact(sig, (void (*)())(uintptr_t)act32.sa_handler, &set, 212 act32.sa_flags); 213 } 214 215 mutex_exit(&p->p_lock); 216 217 if (sigcld_look) 218 sigcld_repost(); 219 220 if (oactp && 221 copyout(&oact32, oactp, sizeof (oact32))) 222 return (set_errno(EFAULT)); 223 224 return (0); 225 } 226 #endif /* _SYSCALL32_IMPL */ 227