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 1.4 2003/10/13 18:12:07 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 #if __BSD_VISIBLE 107 #define SIGTHR 32 /* Thread interrupt (FreeBSD-5 reserved) */ 108 #define SIGCKPT 33 /* checkpoint and continue */ 109 #define SIGCKPTEXIT 34 /* checkpoint and exit */ 110 #endif 111 112 /*- 113 * Type of a signal handling function. 114 * 115 * Language spec sez signal handlers take exactly one arg, even though we 116 * actually supply three. Ugh! 117 * 118 * We don't try to hide the difference by leaving out the args because 119 * that would cause warnings about conformant programs. Nonconformant 120 * programs can avoid the warnings by casting to (__sighandler_t *) or 121 * sig_t before calling signal() or assigning to sa_handler or sv_handler. 122 * 123 * The kernel should reverse the cast before calling the function. It 124 * has no way to do this, but on most machines 1-arg and 3-arg functions 125 * have the same calling protocol so there is no problem in practice. 126 * A bit in sa_flags could be used to specify the number of args. 127 */ 128 typedef void __sighandler_t (int); 129 130 #define SIG_DFL ((__sighandler_t *)0) 131 #define SIG_IGN ((__sighandler_t *)1) 132 #define SIG_ERR ((__sighandler_t *)-1) 133 134 #if defined(_P1003_1B_VISIBLE) || defined(_KERNEL) 135 union sigval { 136 /* Members as suggested by Annex C of POSIX 1003.1b. */ 137 int sigval_int; 138 void *sigval_ptr; 139 }; 140 141 struct sigevent { 142 int sigev_notify; /* Notification type */ 143 union { 144 int __sigev_signo; /* Signal number */ 145 int __sigev_notify_kqueue; 146 } __sigev_u; 147 union sigval sigev_value; /* Signal value */ 148 }; 149 #define sigev_signo __sigev_u.__sigev_signo 150 #define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue 151 152 #define SIGEV_NONE 0 /* No async notification */ 153 #define SIGEV_SIGNAL 1 /* Generate a queued signal */ 154 #define SIGEV_KEVENT 3 /* Generate a kevent */ 155 156 typedef struct __siginfo { 157 int si_signo; /* signal number */ 158 int si_errno; /* errno association */ 159 /* 160 * Cause of signal, one of the SI_ macros or signal-specific 161 * values, i.e. one of the FPE_... values for SIGFPE. This 162 * value is equivalent to the second argument to an old-style 163 * FreeBSD signal handler. 164 */ 165 int si_code; /* signal code */ 166 int si_pid; /* sending process */ 167 unsigned int si_uid; /* sender's ruid */ 168 int si_status; /* exit value */ 169 void *si_addr; /* faulting instruction */ 170 union sigval si_value; /* signal value */ 171 long si_band; /* band event for SIGPOLL */ 172 int __spare__[7]; /* gimme some slack */ 173 } siginfo_t; 174 #endif /* _P1003_1B_VISIBLE */ 175 176 typedef struct __sigset { 177 unsigned int __bits[_SIG_WORDS]; 178 } sigset_t; 179 180 /* 181 * XXX - there are some nasty dependencies on include file order. Now that 182 * sigset_t has been defined we can include the MD header. 183 */ 184 #include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */ 185 186 #if !defined(_ANSI_SOURCE) 187 188 struct __siginfo; 189 190 /* 191 * Signal vector "template" used in sigaction call. 192 */ 193 struct sigaction { 194 union { 195 void (*__sa_handler) (int); 196 void (*__sa_sigaction) (int, struct __siginfo *, 197 void *); 198 } __sigaction_u; /* signal handler */ 199 int sa_flags; /* see signal options below */ 200 sigset_t sa_mask; /* signal mask to apply */ 201 }; 202 203 /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */ 204 #define sa_handler __sigaction_u.__sa_handler 205 206 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ 207 208 #if !defined(_POSIX_SOURCE) 209 210 #define sa_sigaction __sigaction_u.__sa_sigaction 211 212 #define SA_ONSTACK 0x0001 /* take signal on signal stack */ 213 #define SA_RESTART 0x0002 /* restart system call on signal return */ 214 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ 215 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ 216 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */ 217 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */ 218 #ifdef COMPAT_SUNOS 219 #define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */ 220 #endif 221 222 #define NSIG 64 /* size of sigptbl */ 223 224 /* POSIX 1003.1b required values. */ 225 #define SI_USER 0x10001 226 #define SI_QUEUE 0x10002 227 #define SI_TIMER 0x10003 228 #define SI_ASYNCIO 0x10004 229 #define SI_MESGQ 0x10005 230 231 /* Additional FreeBSD values. */ 232 #define SI_UNDEFINED 0 233 234 typedef void __siginfohandler_t (int, struct __siginfo *, void *); 235 236 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 237 238 #ifdef _BSD_SIZE_T_ 239 typedef _BSD_SIZE_T_ size_t; 240 #undef _BSD_SIZE_T_ 241 #endif 242 243 /* 244 * Structure used in sigaltstack call. 245 */ 246 typedef struct sigaltstack { 247 char *ss_sp; /* signal stack base */ 248 size_t ss_size; /* signal stack length */ 249 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */ 250 } stack_t; 251 252 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */ 253 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ 254 #define MINSIGSTKSZ 8192 /* minimum allowable stack */ 255 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */ 256 257 /* Have enough typedefs for this now. XXX */ 258 #include <sys/ucontext.h> 259 260 /* 261 * 4.3 compatibility: 262 * Signal vector "template" used in sigvec call. 263 */ 264 struct sigvec { 265 __sighandler_t *sv_handler; /* signal handler */ 266 int sv_mask; /* signal mask to apply */ 267 int sv_flags; /* see signal options below */ 268 }; 269 270 #define SV_ONSTACK SA_ONSTACK 271 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ 272 #define SV_RESETHAND SA_RESETHAND 273 #define SV_NODEFER SA_NODEFER 274 #define SV_NOCLDSTOP SA_NOCLDSTOP 275 #define SV_SIGINFO SA_SIGINFO 276 #define sv_onstack sv_flags /* isn't compatibility wonderful! */ 277 278 /* 279 * Structure used in sigstack call. 280 */ 281 struct sigstack { 282 char *ss_sp; /* signal stack pointer */ 283 int ss_onstack; /* current status */ 284 }; 285 286 /* 287 * Macro for converting signal number to a mask suitable for 288 * sigblock(). 289 */ 290 #define sigmask(m) (1 << ((m)-1)) 291 292 #define BADSIG SIG_ERR 293 294 #endif /* !_POSIX_SOURCE */ 295 296 /* 297 * Flags for sigprocmask: 298 */ 299 #define SIG_BLOCK 1 /* block specified signal set */ 300 #define SIG_UNBLOCK 2 /* unblock specified signal set */ 301 #define SIG_SETMASK 3 /* set specified signal set */ 302 303 #endif /* !_ANSI_SOURCE */ 304 305 /* 306 * For historical reasons; programs expect signal's return value to be 307 * defined by <sys/signal.h>. 308 */ 309 __BEGIN_DECLS 310 __sighandler_t *signal (int, __sighandler_t *); 311 __END_DECLS 312 313 #endif /* !_SYS_SIGNAL_H_ */ 314