signal.h revision 151574
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 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)signal.h 8.4 (Berkeley) 5/4/95 35 * $FreeBSD: head/sys/sys/signal.h 151574 2005-10-23 03:59:52Z davidxu $ 36 */ 37 38#ifndef _SYS_SIGNAL_H_ 39#define _SYS_SIGNAL_H_ 40 41#include <sys/cdefs.h> 42#include <sys/_types.h> 43#include <sys/_sigset.h> 44 45#include <machine/_limits.h> /* __MINSIGSTKSZ */ 46#include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */ 47 48/* 49 * System defined signals. 50 */ 51#if __POSIX_VISIBLE || __XSI_VISIBLE 52#define SIGHUP 1 /* hangup */ 53#endif 54#define SIGINT 2 /* interrupt */ 55#if __POSIX_VISIBLE || __XSI_VISIBLE 56#define SIGQUIT 3 /* quit */ 57#endif 58#define SIGILL 4 /* illegal instr. (not reset when caught) */ 59#if __XSI_VISIBLE 60#define SIGTRAP 5 /* trace trap (not reset when caught) */ 61#endif 62#define SIGABRT 6 /* abort() */ 63#if __BSD_VISIBLE 64#define SIGIOT SIGABRT /* compatibility */ 65#define SIGEMT 7 /* EMT instruction */ 66#endif 67#define SIGFPE 8 /* floating point exception */ 68#if __POSIX_VISIBLE || __XSI_VISIBLE 69#define SIGKILL 9 /* kill (cannot be caught or ignored) */ 70#endif 71#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 72#define SIGBUS 10 /* bus error */ 73#endif 74#define SIGSEGV 11 /* segmentation violation */ 75#if __BSD_VISIBLE 76#define SIGSYS 12 /* non-existent system call invoked */ 77#endif 78#if __POSIX_VISIBLE || __XSI_VISIBLE 79#define SIGPIPE 13 /* write on a pipe with no one to read it */ 80#define SIGALRM 14 /* alarm clock */ 81#endif 82#define SIGTERM 15 /* software termination signal from kill */ 83#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 84#define SIGURG 16 /* urgent condition on IO channel */ 85#endif 86#if __POSIX_VISIBLE || __XSI_VISIBLE 87#define SIGSTOP 17 /* sendable stop signal not from tty */ 88#define SIGTSTP 18 /* stop signal from tty */ 89#define SIGCONT 19 /* continue a stopped process */ 90#define SIGCHLD 20 /* to parent on child stop or exit */ 91#define SIGTTIN 21 /* to readers pgrp upon background tty read */ 92#define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */ 93#endif 94#if __BSD_VISIBLE 95#define SIGIO 23 /* input/output possible signal */ 96#endif 97#if __XSI_VISIBLE 98#define SIGXCPU 24 /* exceeded CPU time limit */ 99#define SIGXFSZ 25 /* exceeded file size limit */ 100#define SIGVTALRM 26 /* virtual time alarm */ 101#define SIGPROF 27 /* profiling time alarm */ 102#endif 103#if __BSD_VISIBLE 104#define SIGWINCH 28 /* window size changes */ 105#define SIGINFO 29 /* information request */ 106#endif 107#if __POSIX_VISIBLE || __XSI_VISIBLE 108#define SIGUSR1 30 /* user defined signal 1 */ 109#define SIGUSR2 31 /* user defined signal 2 */ 110#endif 111#if __BSD_VISIBLE 112#define SIGTHR 32 /* Thread interrupt. */ 113#endif 114 115#define SIGRTMIN 65 116#define SIGRTMAX 128 117 118#define SIG_DFL ((__sighandler_t *)0) 119#define SIG_IGN ((__sighandler_t *)1) 120#define SIG_ERR ((__sighandler_t *)-1) 121/* 122 * XXX missing SIG_HOLD. 123 */ 124 125/*- 126 * Type of a signal handling function. 127 * 128 * Language spec sez signal handlers take exactly one arg, even though we 129 * actually supply three. Ugh! 130 * 131 * We don't try to hide the difference by leaving out the args because 132 * that would cause warnings about conformant programs. Nonconformant 133 * programs can avoid the warnings by casting to (__sighandler_t *) or 134 * sig_t before calling signal() or assigning to sa_handler or sv_handler. 135 * 136 * The kernel should reverse the cast before calling the function. It 137 * has no way to do this, but on most machines 1-arg and 3-arg functions 138 * have the same calling protocol so there is no problem in practice. 139 * A bit in sa_flags could be used to specify the number of args. 140 */ 141typedef void __sighandler_t(int); 142 143#if __POSIX_VISIBLE || __XSI_VISIBLE 144#ifndef _SIGSET_T_DECLARED 145#define _SIGSET_T_DECLARED 146typedef __sigset_t sigset_t; 147#endif 148#endif 149 150#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500 151union sigval { 152 /* Members as suggested by Annex C of POSIX 1003.1b. */ 153 int sigval_int; 154 void *sigval_ptr; 155}; 156#endif 157 158#if __POSIX_VISIBLE >= 199309 159struct sigevent { 160 int sigev_notify; /* Notification type */ 161 union { 162 int __sigev_signo; /* Signal number */ 163 int __sigev_notify_kqueue; 164 } __sigev_u; 165 union sigval sigev_value; /* Signal value */ 166/* 167 * XXX missing sigev_notify_function, sigev_notify_attributes. 168 */ 169}; 170#define sigev_signo __sigev_u.__sigev_signo 171#if __BSD_VISIBLE 172#define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue 173#endif 174 175#define SIGEV_NONE 0 /* No async notification */ 176#define SIGEV_SIGNAL 1 /* Generate a queued signal */ 177#if __BSD_VISIBLE 178#define SIGEV_KEVENT 3 /* Generate a kevent */ 179#endif 180/* 181 * XXX missing SIGEV_THREAD. 182 */ 183#endif /* __POSIX_VISIBLE >= 199309 */ 184 185#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE 186typedef struct __siginfo { 187 int si_signo; /* signal number */ 188 int si_errno; /* errno association */ 189 /* 190 * Cause of signal, one of the SI_ macros or signal-specific 191 * values, i.e. one of the FPE_... values for SIGFPE. This 192 * value is equivalent to the second argument to an old-style 193 * FreeBSD signal handler. 194 */ 195 int si_code; /* signal code */ 196 __pid_t si_pid; /* sending process */ 197 __uid_t si_uid; /* sender's ruid */ 198 int si_status; /* exit value */ 199 void *si_addr; /* faulting instruction */ 200 union sigval si_value; /* signal value */ 201 long si_band; /* band event for SIGPOLL */ 202 union { 203 struct { 204 int _trapno;/* machine specific trap code */ 205 } _fault; 206 struct { 207 int _timerid; 208 int _overrun; 209 } _timer; 210 int __spare__[7]; /* gimme some slack */ 211 } _reason; 212} siginfo_t; 213 214#define si_trapno _reason._fault._trapno 215#define si_timerid _reason._timer._timerid 216#define si_overrun _reason._timer._overrun 217 218/** si_code **/ 219/* codes for SIGILL */ 220#define ILL_ILLOPC 1 /* Illegal opcode. */ 221#define ILL_ILLOPN 2 /* Illegal operand. */ 222#define ILL_ILLADR 3 /* Illegal addressing mode. */ 223#define ILL_ILLTRP 4 /* Illegal trap. */ 224#define ILL_PRVOPC 5 /* Privileged opcode. */ 225#define ILL_PRVREG 6 /* Privileged register. */ 226#define ILL_COPROC 7 /* Coprocessor error. */ 227#define ILL_BADSTK 8 /* Internal stack error. */ 228 229/* codes for SIGBUS */ 230#define BUS_ADRALN 1 /* Invalid address alignment. */ 231#define BUS_ADRERR 2 /* Nonexistent physical address. */ 232#define BUS_OBJERR 3 /* Object-specific hardware error. */ 233 234/* codes for SIGSEGV */ 235#define SEGV_MAPERR 1 /* Address not mapped to object. */ 236#define SEGV_ACCERR 2 /* Invalid permissions for mapped */ 237 /* object. */ 238 239/* codes for SIGFPE */ 240#define FPE_INTOVF 1 /* Integer overflow. */ 241#define FPE_INTDIV 2 /* Integer divide by zero. */ 242#define FPE_FLTDIV 3 /* Floating point divide by zero. */ 243#define FPE_FLTOVF 4 /* Floating point overflow. */ 244#define FPE_FLTUND 5 /* Floating point underflow. */ 245#define FPE_FLTRES 6 /* Floating point inexact result. */ 246#define FPE_FLTINV 7 /* Invalid floating point operation. */ 247#define FPE_FLTSUB 8 /* Subscript out of range. */ 248 249/* codes for SIGTRAP */ 250#define TRAP_BRKPT 1 /* Process breakpoint. */ 251#define TRAP_TRACE 2 /* Process trace trap. */ 252 253/* codes for SIGCHLD */ 254#define CLD_EXITED 1 /* Child has exited */ 255#define CLD_KILLED 2 /* Child has terminated abnormally but */ 256 /* did not create a core file */ 257#define CLD_DUMPED 3 /* Child has terminated abnormally and */ 258 /* created a core file */ 259#define CLD_TRAPPED 4 /* Traced child has trapped */ 260#define CLD_STOPPED 5 /* Child has stopped */ 261#define CLD_CONTINUED 6 /* Stopped child has continued */ 262 263/* codes for SIGPOLL */ 264#define POLL_IN 1 /* Data input available */ 265#define POLL_OUT 2 /* Output buffers available */ 266#define POLL_MSG 3 /* Input message available */ 267#define POLL_ERR 4 /* I/O Error */ 268#define POLL_PRI 5 /* High priority input available */ 269#define POLL_HUP 4 /* Device disconnected */ 270 271#endif 272 273#if __POSIX_VISIBLE || __XSI_VISIBLE 274struct __siginfo; 275 276/* 277 * Signal vector "template" used in sigaction call. 278 */ 279struct sigaction { 280 union { 281 void (*__sa_handler)(int); 282 void (*__sa_sigaction)(int, struct __siginfo *, void *); 283 } __sigaction_u; /* signal handler */ 284 int sa_flags; /* see signal options below */ 285 sigset_t sa_mask; /* signal mask to apply */ 286}; 287 288#define sa_handler __sigaction_u.__sa_handler 289#endif 290 291#if __XSI_VISIBLE 292/* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */ 293#define sa_sigaction __sigaction_u.__sa_sigaction 294#endif 295 296#if __POSIX_VISIBLE || __XSI_VISIBLE 297#define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ 298#endif /* __POSIX_VISIBLE || __XSI_VISIBLE */ 299 300#if __XSI_VISIBLE 301#define SA_ONSTACK 0x0001 /* take signal on signal stack */ 302#define SA_RESTART 0x0002 /* restart system call on signal return */ 303#define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ 304#define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ 305#define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */ 306#define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */ 307#endif 308 309#if __BSD_VISIBLE 310#define NSIG 32 /* number of old signals (counting 0) */ 311#endif 312 313#if __POSIX_VISIBLE || __XSI_VISIBLE 314#define SI_USER 0x10001 /* Signal sent by kill(). */ 315#define SI_QUEUE 0x10002 /* Signal sent by the sigqueue(). */ 316#define SI_TIMER 0x10003 /* Signal generated by expiration of */ 317 /* a timer set by timer_settime(). */ 318#define SI_ASYNCIO 0x10004 /* Signal generated by completion of */ 319 /* an asynchronous I/O request.*/ 320#define SI_MESGQ 0x10005 /* Signal generated by arrival of a */ 321 /* message on an empty message queue. */ 322#endif 323#if __BSD_VISIBLE 324#define SI_UNDEFINED 0 325#endif 326 327#if __BSD_VISIBLE 328typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 329typedef void __siginfohandler_t(int, struct __siginfo *, void *); 330#endif 331 332#if __XSI_VISIBLE 333/* 334 * Structure used in sigaltstack call. 335 */ 336#if __BSD_VISIBLE 337typedef struct sigaltstack { 338#else 339typedef struct { 340#endif 341 char *ss_sp; /* signal stack base */ 342 __size_t ss_size; /* signal stack length */ 343 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */ 344} stack_t; 345 346#define SS_ONSTACK 0x0001 /* take signal on alternate stack */ 347#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ 348#define MINSIGSTKSZ __MINSIGSTKSZ /* minimum stack size */ 349#define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */ 350#endif 351 352#if __BSD_VISIBLE 353/* 354 * 4.3 compatibility: 355 * Signal vector "template" used in sigvec call. 356 */ 357struct sigvec { 358 __sighandler_t *sv_handler; /* signal handler */ 359 int sv_mask; /* signal mask to apply */ 360 int sv_flags; /* see signal options below */ 361}; 362 363#define SV_ONSTACK SA_ONSTACK 364#define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ 365#define SV_RESETHAND SA_RESETHAND 366#define SV_NODEFER SA_NODEFER 367#define SV_NOCLDSTOP SA_NOCLDSTOP 368#define SV_SIGINFO SA_SIGINFO 369#define sv_onstack sv_flags /* isn't compatibility wonderful! */ 370#endif 371 372/* Keep this in one place only */ 373#if defined(_KERNEL) && defined(COMPAT_43) && \ 374 !defined(__i386__) && !defined(__alpha__) 375struct osigcontext { 376 int _not_used; 377}; 378#endif 379 380#if __XSI_VISIBLE 381/* 382 * Structure used in sigstack call. 383 */ 384struct sigstack { 385 /* XXX ss_sp's type should be `void *'. */ 386 char *ss_sp; /* signal stack pointer */ 387 int ss_onstack; /* current status */ 388}; 389#endif 390 391#if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112 392/* 393 * Macro for converting signal number to a mask suitable for 394 * sigblock(). 395 */ 396#define sigmask(m) (1 << ((m)-1)) 397#endif 398 399#if __BSD_VISIBLE 400#define BADSIG SIG_ERR 401#endif 402 403#if __POSIX_VISIBLE || __XSI_VISIBLE 404/* 405 * Flags for sigprocmask: 406 */ 407#define SIG_BLOCK 1 /* block specified signal set */ 408#define SIG_UNBLOCK 2 /* unblock specified signal set */ 409#define SIG_SETMASK 3 /* set specified signal set */ 410#endif 411 412/* 413 * For historical reasons; programs expect signal's return value to be 414 * defined by <sys/signal.h>. 415 */ 416__BEGIN_DECLS 417__sighandler_t *signal(int, __sighandler_t *); 418__END_DECLS 419 420#endif /* !_SYS_SIGNAL_H_ */ 421