signal.h revision 158471
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 158471 2006-05-12 05:04:46Z jhb $ 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 /* reserved by thread library. */ 113#define SIGLWP SIGTHR 114#endif 115 116#define SIGRTMIN 65 117#define SIGRTMAX 126 118 119#define SIG_DFL ((__sighandler_t *)0) 120#define SIG_IGN ((__sighandler_t *)1) 121#define SIG_ERR ((__sighandler_t *)-1) 122/* 123 * XXX missing SIG_HOLD. 124 */ 125 126/*- 127 * Type of a signal handling function. 128 * 129 * Language spec sez signal handlers take exactly one arg, even though we 130 * actually supply three. Ugh! 131 * 132 * We don't try to hide the difference by leaving out the args because 133 * that would cause warnings about conformant programs. Nonconformant 134 * programs can avoid the warnings by casting to (__sighandler_t *) or 135 * sig_t before calling signal() or assigning to sa_handler or sv_handler. 136 * 137 * The kernel should reverse the cast before calling the function. It 138 * has no way to do this, but on most machines 1-arg and 3-arg functions 139 * have the same calling protocol so there is no problem in practice. 140 * A bit in sa_flags could be used to specify the number of args. 141 */ 142typedef void __sighandler_t(int); 143 144#if __POSIX_VISIBLE || __XSI_VISIBLE 145#ifndef _SIGSET_T_DECLARED 146#define _SIGSET_T_DECLARED 147typedef __sigset_t sigset_t; 148#endif 149#endif 150 151#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500 152union sigval { 153 /* Members as suggested by Annex C of POSIX 1003.1b. */ 154 int sival_int; 155 void *sival_ptr; 156}; 157#endif 158 159#if __POSIX_VISIBLE >= 199309 160struct sigevent { 161 int sigev_notify; /* Notification type */ 162 int sigev_signo; /* Signal number */ 163 union sigval sigev_value; /* Signal value */ 164 union { 165 __lwpid_t _threadid; 166 struct { 167 void (*_function)(union sigval); 168 void *_attribute; /* pthread_attr_t * */ 169 } _sigev_thread; 170 long __spare__[8]; 171 } _sigev_un; 172}; 173 174#if __BSD_VISIBLE 175#define sigev_notify_kqueue sigev_signo 176#define sigev_notify_thread_id _sigev_un._threadid 177#endif 178#define sigev_notify_function _sigev_un._sigev_thread._function 179#define sigev_notify_attributes _sigev_un._sigev_thread._attribute 180 181#define SIGEV_NONE 0 /* No async notification. */ 182#define SIGEV_SIGNAL 1 /* Generate a queued signal. */ 183#define SIGEV_THREAD 2 /* Call back from another pthread. */ 184#if __BSD_VISIBLE 185#define SIGEV_KEVENT 3 /* Generate a kevent. */ 186#define SIGEV_THREAD_ID 4 /* Send signal to a kernel thread. */ 187#endif 188#endif /* __POSIX_VISIBLE >= 199309 */ 189 190#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE 191typedef struct __siginfo { 192 int si_signo; /* signal number */ 193 int si_errno; /* errno association */ 194 /* 195 * Cause of signal, one of the SI_ macros or signal-specific 196 * values, i.e. one of the FPE_... values for SIGFPE. This 197 * value is equivalent to the second argument to an old-style 198 * FreeBSD signal handler. 199 */ 200 int si_code; /* signal code */ 201 __pid_t si_pid; /* sending process */ 202 __uid_t si_uid; /* sender's ruid */ 203 int si_status; /* exit value */ 204 void *si_addr; /* faulting instruction */ 205 union sigval si_value; /* signal value */ 206 union { 207 struct { 208 int _trapno;/* machine specific trap code */ 209 } _fault; 210 struct { 211 int _timerid; 212 int _overrun; 213 } _timer; 214 struct { 215 int _mqd; 216 } _mesgq; 217 struct { 218 long _band; /* band event for SIGPOLL */ 219 } _poll; /* was this ever used ? */ 220 struct { 221 long __spare1__; 222 int __spare2__[7]; 223 } __spare__; 224 } _reason; 225} siginfo_t; 226 227#define si_trapno _reason._fault._trapno 228#define si_timerid _reason._timer._timerid 229#define si_overrun _reason._timer._overrun 230#define si_mqd _reason._mesgq._mqd 231#define si_band _reason._poll._band 232 233/** si_code **/ 234/* codes for SIGILL */ 235#define ILL_ILLOPC 1 /* Illegal opcode. */ 236#define ILL_ILLOPN 2 /* Illegal operand. */ 237#define ILL_ILLADR 3 /* Illegal addressing mode. */ 238#define ILL_ILLTRP 4 /* Illegal trap. */ 239#define ILL_PRVOPC 5 /* Privileged opcode. */ 240#define ILL_PRVREG 6 /* Privileged register. */ 241#define ILL_COPROC 7 /* Coprocessor error. */ 242#define ILL_BADSTK 8 /* Internal stack error. */ 243 244/* codes for SIGBUS */ 245#define BUS_ADRALN 1 /* Invalid address alignment. */ 246#define BUS_ADRERR 2 /* Nonexistent physical address. */ 247#define BUS_OBJERR 3 /* Object-specific hardware error. */ 248 249/* codes for SIGSEGV */ 250#define SEGV_MAPERR 1 /* Address not mapped to object. */ 251#define SEGV_ACCERR 2 /* Invalid permissions for mapped */ 252 /* object. */ 253 254/* codes for SIGFPE */ 255#define FPE_INTOVF 1 /* Integer overflow. */ 256#define FPE_INTDIV 2 /* Integer divide by zero. */ 257#define FPE_FLTDIV 3 /* Floating point divide by zero. */ 258#define FPE_FLTOVF 4 /* Floating point overflow. */ 259#define FPE_FLTUND 5 /* Floating point underflow. */ 260#define FPE_FLTRES 6 /* Floating point inexact result. */ 261#define FPE_FLTINV 7 /* Invalid floating point operation. */ 262#define FPE_FLTSUB 8 /* Subscript out of range. */ 263 264/* codes for SIGTRAP */ 265#define TRAP_BRKPT 1 /* Process breakpoint. */ 266#define TRAP_TRACE 2 /* Process trace trap. */ 267 268/* codes for SIGCHLD */ 269#define CLD_EXITED 1 /* Child has exited */ 270#define CLD_KILLED 2 /* Child has terminated abnormally but */ 271 /* did not create a core file */ 272#define CLD_DUMPED 3 /* Child has terminated abnormally and */ 273 /* created a core file */ 274#define CLD_TRAPPED 4 /* Traced child has trapped */ 275#define CLD_STOPPED 5 /* Child has stopped */ 276#define CLD_CONTINUED 6 /* Stopped child has continued */ 277 278/* codes for SIGPOLL */ 279#define POLL_IN 1 /* Data input available */ 280#define POLL_OUT 2 /* Output buffers available */ 281#define POLL_MSG 3 /* Input message available */ 282#define POLL_ERR 4 /* I/O Error */ 283#define POLL_PRI 5 /* High priority input available */ 284#define POLL_HUP 4 /* Device disconnected */ 285 286#endif 287 288#if __POSIX_VISIBLE || __XSI_VISIBLE 289struct __siginfo; 290 291/* 292 * Signal vector "template" used in sigaction call. 293 */ 294struct sigaction { 295 union { 296 void (*__sa_handler)(int); 297 void (*__sa_sigaction)(int, struct __siginfo *, void *); 298 } __sigaction_u; /* signal handler */ 299 int sa_flags; /* see signal options below */ 300 sigset_t sa_mask; /* signal mask to apply */ 301}; 302 303#define sa_handler __sigaction_u.__sa_handler 304#endif 305 306#if __XSI_VISIBLE 307/* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */ 308#define sa_sigaction __sigaction_u.__sa_sigaction 309#endif 310 311#if __POSIX_VISIBLE || __XSI_VISIBLE 312#define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ 313#endif /* __POSIX_VISIBLE || __XSI_VISIBLE */ 314 315#if __XSI_VISIBLE 316#define SA_ONSTACK 0x0001 /* take signal on signal stack */ 317#define SA_RESTART 0x0002 /* restart system call on signal return */ 318#define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ 319#define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ 320#define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */ 321#define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */ 322#endif 323 324#if __BSD_VISIBLE 325#define NSIG 32 /* number of old signals (counting 0) */ 326#endif 327 328#if __POSIX_VISIBLE || __XSI_VISIBLE 329#define SI_NOINFO 0 /* No signal info besides si_signo. */ 330#define SI_USER 0x10001 /* Signal sent by kill(). */ 331#define SI_QUEUE 0x10002 /* Signal sent by the sigqueue(). */ 332#define SI_TIMER 0x10003 /* Signal generated by expiration of */ 333 /* a timer set by timer_settime(). */ 334#define SI_ASYNCIO 0x10004 /* Signal generated by completion of */ 335 /* an asynchronous I/O request.*/ 336#define SI_MESGQ 0x10005 /* Signal generated by arrival of a */ 337 /* message on an empty message queue. */ 338#endif 339#if __BSD_VISIBLE 340#define SI_UNDEFINED 0 341#endif 342 343#if __BSD_VISIBLE 344typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 345typedef void __siginfohandler_t(int, struct __siginfo *, void *); 346#endif 347 348#if __XSI_VISIBLE 349/* 350 * Structure used in sigaltstack call. 351 */ 352#if __BSD_VISIBLE 353typedef struct sigaltstack { 354#else 355typedef struct { 356#endif 357 char *ss_sp; /* signal stack base */ 358 __size_t ss_size; /* signal stack length */ 359 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */ 360} stack_t; 361 362#define SS_ONSTACK 0x0001 /* take signal on alternate stack */ 363#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ 364#define MINSIGSTKSZ __MINSIGSTKSZ /* minimum stack size */ 365#define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */ 366#endif 367 368#if __BSD_VISIBLE 369/* 370 * 4.3 compatibility: 371 * Signal vector "template" used in sigvec call. 372 */ 373struct sigvec { 374 __sighandler_t *sv_handler; /* signal handler */ 375 int sv_mask; /* signal mask to apply */ 376 int sv_flags; /* see signal options below */ 377}; 378 379#define SV_ONSTACK SA_ONSTACK 380#define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ 381#define SV_RESETHAND SA_RESETHAND 382#define SV_NODEFER SA_NODEFER 383#define SV_NOCLDSTOP SA_NOCLDSTOP 384#define SV_SIGINFO SA_SIGINFO 385#define sv_onstack sv_flags /* isn't compatibility wonderful! */ 386#endif 387 388/* Keep this in one place only */ 389#if defined(_KERNEL) && defined(COMPAT_43) && \ 390 !defined(__i386__) 391struct osigcontext { 392 int _not_used; 393}; 394#endif 395 396#if __XSI_VISIBLE 397/* 398 * Structure used in sigstack call. 399 */ 400struct sigstack { 401 /* XXX ss_sp's type should be `void *'. */ 402 char *ss_sp; /* signal stack pointer */ 403 int ss_onstack; /* current status */ 404}; 405#endif 406 407#if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112 408/* 409 * Macro for converting signal number to a mask suitable for 410 * sigblock(). 411 */ 412#define sigmask(m) (1 << ((m)-1)) 413#endif 414 415#if __BSD_VISIBLE 416#define BADSIG SIG_ERR 417#endif 418 419#if __POSIX_VISIBLE || __XSI_VISIBLE 420/* 421 * Flags for sigprocmask: 422 */ 423#define SIG_BLOCK 1 /* block specified signal set */ 424#define SIG_UNBLOCK 2 /* unblock specified signal set */ 425#define SIG_SETMASK 3 /* set specified signal set */ 426#endif 427 428/* 429 * For historical reasons; programs expect signal's return value to be 430 * defined by <sys/signal.h>. 431 */ 432__BEGIN_DECLS 433__sighandler_t *signal(int, __sighandler_t *); 434__END_DECLS 435 436#endif /* !_SYS_SIGNAL_H_ */ 437