1 /* 2 * Copyright (c) 1982, 1986, 1989, 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)signal.h 8.4 (Berkeley) 5/4/95 39 * $FreeBSD: src/sys/sys/signal.h,v 1.23.2.2 2001/04/19 01:38:35 alfred Exp $ 40 * $DragonFly: src/sys/sys/signal.h,v 1.6 2007/01/14 07:59:08 dillon Exp $ 41 */ 42 43 #ifndef _SYS_SIGNAL_H_ 44 #define _SYS_SIGNAL_H_ 45 46 #ifndef _MACHINE_STDINT_H_ 47 #include <machine/stdint.h> /* for __ types */ 48 #endif 49 #include <sys/cdefs.h> 50 #include <sys/_posix.h> 51 52 /* 53 * sigset_t macros. 54 */ 55 #define _SIG_WORDS 4 56 #define _SIG_MAXSIG 128 57 #define _SIG_IDX(sig) ((sig) - 1) 58 #define _SIG_WORD(sig) (_SIG_IDX(sig) >> 5) 59 #define _SIG_BIT(sig) (1 << (_SIG_IDX(sig) & 31)) 60 #define _SIG_VALID(sig) ((sig) < _SIG_MAXSIG && (sig) > 0) 61 62 /* 63 * System defined signals. 64 */ 65 #define SIGHUP 1 /* hangup */ 66 #define SIGINT 2 /* interrupt */ 67 #define SIGQUIT 3 /* quit */ 68 #define SIGILL 4 /* illegal instr. (not reset when caught) */ 69 #ifndef _POSIX_SOURCE 70 #define SIGTRAP 5 /* trace trap (not reset when caught) */ 71 #endif 72 #define SIGABRT 6 /* abort() */ 73 #ifndef _POSIX_SOURCE 74 #define SIGIOT SIGABRT /* compatibility */ 75 #define SIGEMT 7 /* EMT instruction */ 76 #endif 77 #define SIGFPE 8 /* floating point exception */ 78 #define SIGKILL 9 /* kill (cannot be caught or ignored) */ 79 #ifndef _POSIX_SOURCE 80 #define SIGBUS 10 /* bus error */ 81 #endif 82 #define SIGSEGV 11 /* segmentation violation */ 83 #ifndef _POSIX_SOURCE 84 #define SIGSYS 12 /* non-existent system call invoked */ 85 #endif 86 #define SIGPIPE 13 /* write on a pipe with no one to read it */ 87 #define SIGALRM 14 /* alarm clock */ 88 #define SIGTERM 15 /* software termination signal from kill */ 89 #ifndef _POSIX_SOURCE 90 #define SIGURG 16 /* urgent condition on IO channel */ 91 #endif 92 #define SIGSTOP 17 /* sendable stop signal not from tty */ 93 #define SIGTSTP 18 /* stop signal from tty */ 94 #define SIGCONT 19 /* continue a stopped process */ 95 #define SIGCHLD 20 /* to parent on child stop or exit */ 96 #define SIGTTIN 21 /* to readers pgrp upon background tty read */ 97 #define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */ 98 #ifndef _POSIX_SOURCE 99 #define SIGIO 23 /* input/output possible signal */ 100 #define SIGXCPU 24 /* exceeded CPU time limit */ 101 #define SIGXFSZ 25 /* exceeded file size limit */ 102 #define SIGVTALRM 26 /* virtual time alarm */ 103 #define SIGPROF 27 /* profiling time alarm */ 104 #define SIGWINCH 28 /* window size changes */ 105 #define SIGINFO 29 /* information request */ 106 #endif 107 #define SIGUSR1 30 /* user defined signal 1 */ 108 #define SIGUSR2 31 /* user defined signal 2 */ 109 #if __BSD_VISIBLE 110 #define SIGTHR 32 /* Thread interrupt (FreeBSD-5 reserved) */ 111 #define SIGCKPT 33 /* checkpoint and continue */ 112 #define SIGCKPTEXIT 34 /* checkpoint and exit */ 113 #endif 114 115 /*- 116 * Type of a signal handling function. 117 * 118 * Language spec sez signal handlers take exactly one arg, even though we 119 * actually supply three. Ugh! 120 * 121 * We don't try to hide the difference by leaving out the args because 122 * that would cause warnings about conformant programs. Nonconformant 123 * programs can avoid the warnings by casting to (__sighandler_t *) or 124 * sig_t before calling signal() or assigning to sa_handler or sv_handler. 125 * 126 * The kernel should reverse the cast before calling the function. It 127 * has no way to do this, but on most machines 1-arg and 3-arg functions 128 * have the same calling protocol so there is no problem in practice. 129 * A bit in sa_flags could be used to specify the number of args. 130 * 131 * SIG_EINTR causes system calls to interrupt but generates no signal 132 * delivery. The caller is responsible for polling the event. 133 */ 134 typedef void __sighandler_t (int); 135 136 #define SIG_DFL ((__sighandler_t *)0) 137 #define SIG_IGN ((__sighandler_t *)1) 138 #define SIG_ERR ((__sighandler_t *)-1) 139 140 #if defined(_P1003_1B_VISIBLE) || defined(_KERNEL) 141 union sigval { 142 /* Members as suggested by Annex C of POSIX 1003.1b. */ 143 int sigval_int; 144 void *sigval_ptr; 145 }; 146 147 struct sigevent { 148 int sigev_notify; /* Notification type */ 149 union { 150 int __sigev_signo; /* Signal number */ 151 int __sigev_notify_kqueue; 152 } __sigev_u; 153 union sigval sigev_value; /* Signal value */ 154 }; 155 #define sigev_signo __sigev_u.__sigev_signo 156 #define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue 157 158 #define SIGEV_NONE 0 /* No async notification */ 159 #define SIGEV_SIGNAL 1 /* Generate a queued signal */ 160 #define SIGEV_KEVENT 3 /* Generate a kevent */ 161 162 typedef struct __siginfo { 163 int si_signo; /* signal number */ 164 int si_errno; /* errno association */ 165 /* 166 * Cause of signal, one of the SI_ macros or signal-specific 167 * values, i.e. one of the FPE_... values for SIGFPE. This 168 * value is equivalent to the second argument to an old-style 169 * FreeBSD signal handler. 170 */ 171 int si_code; /* signal code */ 172 int si_pid; /* sending process */ 173 unsigned int si_uid; /* sender's ruid */ 174 int si_status; /* exit value */ 175 void *si_addr; /* faulting instruction */ 176 union sigval si_value; /* signal value */ 177 long si_band; /* band event for SIGPOLL */ 178 int __spare__[7]; /* gimme some slack */ 179 } siginfo_t; 180 #endif /* _P1003_1B_VISIBLE */ 181 182 typedef struct __sigset { 183 unsigned int __bits[_SIG_WORDS]; 184 } sigset_t; 185 186 /* 187 * XXX - there are some nasty dependencies on include file order. Now that 188 * sigset_t has been defined we can include the MD header. 189 */ 190 #include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */ 191 192 #if !defined(_ANSI_SOURCE) 193 194 struct __siginfo; 195 196 /* 197 * Signal vector "template" used in sigaction call. 198 */ 199 struct sigaction { 200 union { 201 void (*__sa_handler) (int); 202 void (*__sa_sigaction) (int, struct __siginfo *, void *); 203 int *__sa_mailbox; 204 } __sigaction_u; /* signal handler */ 205 int sa_flags; /* see signal options below */ 206 sigset_t sa_mask; /* signal mask to apply */ 207 }; 208 209 /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */ 210 #define sa_handler __sigaction_u.__sa_handler 211 212 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ 213 214 #if !defined(_POSIX_SOURCE) 215 216 #define sa_sigaction __sigaction_u.__sa_sigaction 217 #define sa_mailbox __sigaction_u.__sa_mailbox 218 219 #define SA_ONSTACK 0x0001 /* take signal on signal stack */ 220 #define SA_RESTART 0x0002 /* restart system call on signal return */ 221 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ 222 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ 223 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */ 224 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */ 225 #ifdef COMPAT_SUNOS 226 #define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */ 227 #endif 228 #define SA_MAILBOX 0x1000 /* store to mailbox */ 229 230 #define NSIG 64 /* size of sigptbl */ 231 232 /* POSIX 1003.1b required values. */ 233 #define SI_USER 0x10001 234 #define SI_QUEUE 0x10002 235 #define SI_TIMER 0x10003 236 #define SI_ASYNCIO 0x10004 237 #define SI_MESGQ 0x10005 238 239 /* Additional FreeBSD values. */ 240 #define SI_UNDEFINED 0 241 242 typedef void __siginfohandler_t (int, struct __siginfo *, void *); 243 244 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 245 246 /* 247 * Structure used in sigaltstack call. 248 */ 249 typedef struct sigaltstack { 250 char *ss_sp; /* signal stack base */ 251 __size_t ss_size; /* signal stack length */ 252 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */ 253 } stack_t; 254 255 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */ 256 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ 257 #define MINSIGSTKSZ 8192 /* minimum allowable stack */ 258 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */ 259 260 /* Have enough typedefs for this now. XXX */ 261 #include <sys/ucontext.h> 262 263 /* 264 * 4.3 compatibility: 265 * Signal vector "template" used in sigvec call. 266 */ 267 struct sigvec { 268 __sighandler_t *sv_handler; /* signal handler */ 269 int sv_mask; /* signal mask to apply */ 270 int sv_flags; /* see signal options below */ 271 }; 272 273 #define SV_ONSTACK SA_ONSTACK 274 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ 275 #define SV_RESETHAND SA_RESETHAND 276 #define SV_NODEFER SA_NODEFER 277 #define SV_NOCLDSTOP SA_NOCLDSTOP 278 #define SV_SIGINFO SA_SIGINFO 279 #define sv_onstack sv_flags /* isn't compatibility wonderful! */ 280 281 /* 282 * Structure used in sigstack call. 283 */ 284 struct sigstack { 285 char *ss_sp; /* signal stack pointer */ 286 int ss_onstack; /* current status */ 287 }; 288 289 /* 290 * Macro for converting signal number to a mask suitable for 291 * sigblock(). 292 */ 293 #define sigmask(m) (1 << ((m)-1)) 294 295 #define BADSIG SIG_ERR 296 297 #endif /* !_POSIX_SOURCE */ 298 299 /* 300 * Flags for sigprocmask: 301 */ 302 #define SIG_BLOCK 1 /* block specified signal set */ 303 #define SIG_UNBLOCK 2 /* unblock specified signal set */ 304 #define SIG_SETMASK 3 /* set specified signal set */ 305 306 #endif /* !_ANSI_SOURCE */ 307 308 /* 309 * For historical reasons; programs expect signal's return value to be 310 * defined by <sys/signal.h>. 311 */ 312 __BEGIN_DECLS 313 __sighandler_t *signal (int, __sighandler_t *); 314 __END_DECLS 315 316 #endif /* !_SYS_SIGNAL_H_ */ 317