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 1.2 2003/06/17 04:28:58 dillon Exp $ 41 */ 42 43 #ifndef _SYS_SIGNAL_H_ 44 #define _SYS_SIGNAL_H_ 45 46 #include <sys/cdefs.h> 47 #include <sys/_posix.h> 48 49 /* 50 * sigset_t macros. 51 */ 52 #define _SIG_WORDS 4 53 #define _SIG_MAXSIG 128 54 #define _SIG_IDX(sig) ((sig) - 1) 55 #define _SIG_WORD(sig) (_SIG_IDX(sig) >> 5) 56 #define _SIG_BIT(sig) (1 << (_SIG_IDX(sig) & 31)) 57 #define _SIG_VALID(sig) ((sig) < _SIG_MAXSIG && (sig) > 0) 58 59 /* 60 * System defined signals. 61 */ 62 #define SIGHUP 1 /* hangup */ 63 #define SIGINT 2 /* interrupt */ 64 #define SIGQUIT 3 /* quit */ 65 #define SIGILL 4 /* illegal instr. (not reset when caught) */ 66 #ifndef _POSIX_SOURCE 67 #define SIGTRAP 5 /* trace trap (not reset when caught) */ 68 #endif 69 #define SIGABRT 6 /* abort() */ 70 #ifndef _POSIX_SOURCE 71 #define SIGIOT SIGABRT /* compatibility */ 72 #define SIGEMT 7 /* EMT instruction */ 73 #endif 74 #define SIGFPE 8 /* floating point exception */ 75 #define SIGKILL 9 /* kill (cannot be caught or ignored) */ 76 #ifndef _POSIX_SOURCE 77 #define SIGBUS 10 /* bus error */ 78 #endif 79 #define SIGSEGV 11 /* segmentation violation */ 80 #ifndef _POSIX_SOURCE 81 #define SIGSYS 12 /* non-existent system call invoked */ 82 #endif 83 #define SIGPIPE 13 /* write on a pipe with no one to read it */ 84 #define SIGALRM 14 /* alarm clock */ 85 #define SIGTERM 15 /* software termination signal from kill */ 86 #ifndef _POSIX_SOURCE 87 #define SIGURG 16 /* urgent condition on IO channel */ 88 #endif 89 #define SIGSTOP 17 /* sendable stop signal not from tty */ 90 #define SIGTSTP 18 /* stop signal from tty */ 91 #define SIGCONT 19 /* continue a stopped process */ 92 #define SIGCHLD 20 /* to parent on child stop or exit */ 93 #define SIGTTIN 21 /* to readers pgrp upon background tty read */ 94 #define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */ 95 #ifndef _POSIX_SOURCE 96 #define SIGIO 23 /* input/output possible signal */ 97 #define SIGXCPU 24 /* exceeded CPU time limit */ 98 #define SIGXFSZ 25 /* exceeded file size limit */ 99 #define SIGVTALRM 26 /* virtual time alarm */ 100 #define SIGPROF 27 /* profiling time alarm */ 101 #define SIGWINCH 28 /* window size changes */ 102 #define SIGINFO 29 /* information request */ 103 #endif 104 #define SIGUSR1 30 /* user defined signal 1 */ 105 #define SIGUSR2 31 /* user defined signal 2 */ 106 107 /*- 108 * Type of a signal handling function. 109 * 110 * Language spec sez signal handlers take exactly one arg, even though we 111 * actually supply three. Ugh! 112 * 113 * We don't try to hide the difference by leaving out the args because 114 * that would cause warnings about conformant programs. Nonconformant 115 * programs can avoid the warnings by casting to (__sighandler_t *) or 116 * sig_t before calling signal() or assigning to sa_handler or sv_handler. 117 * 118 * The kernel should reverse the cast before calling the function. It 119 * has no way to do this, but on most machines 1-arg and 3-arg functions 120 * have the same calling protocol so there is no problem in practice. 121 * A bit in sa_flags could be used to specify the number of args. 122 */ 123 typedef void __sighandler_t __P((int)); 124 125 #define SIG_DFL ((__sighandler_t *)0) 126 #define SIG_IGN ((__sighandler_t *)1) 127 #define SIG_ERR ((__sighandler_t *)-1) 128 129 #if defined(_P1003_1B_VISIBLE) || defined(_KERNEL) 130 union sigval { 131 /* Members as suggested by Annex C of POSIX 1003.1b. */ 132 int sigval_int; 133 void *sigval_ptr; 134 }; 135 136 struct sigevent { 137 int sigev_notify; /* Notification type */ 138 union { 139 int __sigev_signo; /* Signal number */ 140 int __sigev_notify_kqueue; 141 } __sigev_u; 142 union sigval sigev_value; /* Signal value */ 143 }; 144 #define sigev_signo __sigev_u.__sigev_signo 145 #define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue 146 147 #define SIGEV_NONE 0 /* No async notification */ 148 #define SIGEV_SIGNAL 1 /* Generate a queued signal */ 149 #define SIGEV_KEVENT 3 /* Generate a kevent */ 150 151 typedef struct __siginfo { 152 int si_signo; /* signal number */ 153 int si_errno; /* errno association */ 154 /* 155 * Cause of signal, one of the SI_ macros or signal-specific 156 * values, i.e. one of the FPE_... values for SIGFPE. This 157 * value is equivalent to the second argument to an old-style 158 * FreeBSD signal handler. 159 */ 160 int si_code; /* signal code */ 161 int si_pid; /* sending process */ 162 unsigned int si_uid; /* sender's ruid */ 163 int si_status; /* exit value */ 164 void *si_addr; /* faulting instruction */ 165 union sigval si_value; /* signal value */ 166 long si_band; /* band event for SIGPOLL */ 167 int __spare__[7]; /* gimme some slack */ 168 } siginfo_t; 169 #endif /* _P1003_1B_VISIBLE */ 170 171 typedef struct __sigset { 172 unsigned int __bits[_SIG_WORDS]; 173 } sigset_t; 174 175 /* 176 * XXX - there are some nasty dependencies on include file order. Now that 177 * sigset_t has been defined we can include the MD header. 178 */ 179 #include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */ 180 181 #if !defined(_ANSI_SOURCE) 182 183 struct __siginfo; 184 185 /* 186 * Signal vector "template" used in sigaction call. 187 */ 188 struct sigaction { 189 union { 190 void (*__sa_handler) __P((int)); 191 void (*__sa_sigaction) __P((int, struct __siginfo *, 192 void *)); 193 } __sigaction_u; /* signal handler */ 194 int sa_flags; /* see signal options below */ 195 sigset_t sa_mask; /* signal mask to apply */ 196 }; 197 198 /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */ 199 #define sa_handler __sigaction_u.__sa_handler 200 201 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ 202 203 #if !defined(_POSIX_SOURCE) 204 205 #define sa_sigaction __sigaction_u.__sa_sigaction 206 207 #define SA_ONSTACK 0x0001 /* take signal on signal stack */ 208 #define SA_RESTART 0x0002 /* restart system call on signal return */ 209 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ 210 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ 211 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */ 212 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */ 213 #ifdef COMPAT_SUNOS 214 #define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */ 215 #endif 216 217 #define NSIG 32 /* number of old signals (counting 0) */ 218 219 /* POSIX 1003.1b required values. */ 220 #define SI_USER 0x10001 221 #define SI_QUEUE 0x10002 222 #define SI_TIMER 0x10003 223 #define SI_ASYNCIO 0x10004 224 #define SI_MESGQ 0x10005 225 226 /* Additional FreeBSD values. */ 227 #define SI_UNDEFINED 0 228 229 typedef void __siginfohandler_t __P((int, struct __siginfo *, void *)); 230 231 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 232 233 #ifdef _BSD_SIZE_T_ 234 typedef _BSD_SIZE_T_ size_t; 235 #undef _BSD_SIZE_T_ 236 #endif 237 238 /* 239 * Structure used in sigaltstack call. 240 */ 241 typedef struct sigaltstack { 242 char *ss_sp; /* signal stack base */ 243 size_t ss_size; /* signal stack length */ 244 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */ 245 } stack_t; 246 247 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */ 248 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ 249 #define MINSIGSTKSZ 8192 /* minimum allowable stack */ 250 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */ 251 252 /* Have enough typedefs for this now. XXX */ 253 #include <sys/ucontext.h> 254 255 /* 256 * 4.3 compatibility: 257 * Signal vector "template" used in sigvec call. 258 */ 259 struct sigvec { 260 __sighandler_t *sv_handler; /* signal handler */ 261 int sv_mask; /* signal mask to apply */ 262 int sv_flags; /* see signal options below */ 263 }; 264 265 #define SV_ONSTACK SA_ONSTACK 266 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ 267 #define SV_RESETHAND SA_RESETHAND 268 #define SV_NODEFER SA_NODEFER 269 #define SV_NOCLDSTOP SA_NOCLDSTOP 270 #define SV_SIGINFO SA_SIGINFO 271 #define sv_onstack sv_flags /* isn't compatibility wonderful! */ 272 273 /* 274 * Structure used in sigstack call. 275 */ 276 struct sigstack { 277 char *ss_sp; /* signal stack pointer */ 278 int ss_onstack; /* current status */ 279 }; 280 281 /* 282 * Macro for converting signal number to a mask suitable for 283 * sigblock(). 284 */ 285 #define sigmask(m) (1 << ((m)-1)) 286 287 #define BADSIG SIG_ERR 288 289 #endif /* !_POSIX_SOURCE */ 290 291 /* 292 * Flags for sigprocmask: 293 */ 294 #define SIG_BLOCK 1 /* block specified signal set */ 295 #define SIG_UNBLOCK 2 /* unblock specified signal set */ 296 #define SIG_SETMASK 3 /* set specified signal set */ 297 298 #endif /* !_ANSI_SOURCE */ 299 300 /* 301 * For historical reasons; programs expect signal's return value to be 302 * defined by <sys/signal.h>. 303 */ 304 __BEGIN_DECLS 305 __sighandler_t *signal __P((int, __sighandler_t *)); 306 __END_DECLS 307 308 #endif /* !_SYS_SIGNAL_H_ */ 309