signal.h revision 325029
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: stable/11/sys/sys/signal.h 325029 2017-10-27 04:38:42Z bdrewery $ 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#if __POSIX_VISIBLE >= 200809 49 50#include <sys/_pthreadtypes.h> 51#include <sys/_timespec.h> 52 53#ifndef _SIZE_T_DECLARED 54typedef __size_t size_t; 55#define _SIZE_T_DECLARED 56#endif 57 58#ifndef _UID_T_DECLARED 59typedef __uid_t uid_t; 60#define _UID_T_DECLARED 61#endif 62 63#endif /* __POSIX_VISIBLE >= 200809 */ 64 65/* 66 * System defined signals. 67 */ 68#if __POSIX_VISIBLE || __XSI_VISIBLE 69#define SIGHUP 1 /* hangup */ 70#endif 71#define SIGINT 2 /* interrupt */ 72#if __POSIX_VISIBLE || __XSI_VISIBLE 73#define SIGQUIT 3 /* quit */ 74#endif 75#define SIGILL 4 /* illegal instr. (not reset when caught) */ 76#if __XSI_VISIBLE 77#define SIGTRAP 5 /* trace trap (not reset when caught) */ 78#endif 79#define SIGABRT 6 /* abort() */ 80#if __BSD_VISIBLE 81#define SIGIOT SIGABRT /* compatibility */ 82#define SIGEMT 7 /* EMT instruction */ 83#endif 84#define SIGFPE 8 /* floating point exception */ 85#if __POSIX_VISIBLE || __XSI_VISIBLE 86#define SIGKILL 9 /* kill (cannot be caught or ignored) */ 87#endif 88#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 89#define SIGBUS 10 /* bus error */ 90#endif 91#define SIGSEGV 11 /* segmentation violation */ 92#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 93#define SIGSYS 12 /* non-existent system call invoked */ 94#endif 95#if __POSIX_VISIBLE || __XSI_VISIBLE 96#define SIGPIPE 13 /* write on a pipe with no one to read it */ 97#define SIGALRM 14 /* alarm clock */ 98#endif 99#define SIGTERM 15 /* software termination signal from kill */ 100#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 101#define SIGURG 16 /* urgent condition on IO channel */ 102#endif 103#if __POSIX_VISIBLE || __XSI_VISIBLE 104#define SIGSTOP 17 /* sendable stop signal not from tty */ 105#define SIGTSTP 18 /* stop signal from tty */ 106#define SIGCONT 19 /* continue a stopped process */ 107#define SIGCHLD 20 /* to parent on child stop or exit */ 108#define SIGTTIN 21 /* to readers pgrp upon background tty read */ 109#define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */ 110#endif 111#if __BSD_VISIBLE 112#define SIGIO 23 /* input/output possible signal */ 113#endif 114#if __XSI_VISIBLE 115#define SIGXCPU 24 /* exceeded CPU time limit */ 116#define SIGXFSZ 25 /* exceeded file size limit */ 117#define SIGVTALRM 26 /* virtual time alarm */ 118#define SIGPROF 27 /* profiling time alarm */ 119#endif 120#if __BSD_VISIBLE 121#define SIGWINCH 28 /* window size changes */ 122#define SIGINFO 29 /* information request */ 123#endif 124#if __POSIX_VISIBLE || __XSI_VISIBLE 125#define SIGUSR1 30 /* user defined signal 1 */ 126#define SIGUSR2 31 /* user defined signal 2 */ 127#endif 128#if __BSD_VISIBLE 129#define SIGTHR 32 /* reserved by thread library. */ 130#define SIGLWP SIGTHR 131#define SIGLIBRT 33 /* reserved by real-time library. */ 132#endif 133 134#define SIGRTMIN 65 135#define SIGRTMAX 126 136 137#define SIG_DFL ((__sighandler_t *)0) 138#define SIG_IGN ((__sighandler_t *)1) 139#define SIG_ERR ((__sighandler_t *)-1) 140/* #define SIG_CATCH ((__sighandler_t *)2) See signalvar.h */ 141#define SIG_HOLD ((__sighandler_t *)3) 142 143/* 144 * Type of a signal handling function. 145 * 146 * Language spec sez signal handlers take exactly one arg, even though we 147 * actually supply three. Ugh! 148 * 149 * We don't try to hide the difference by leaving out the args because 150 * that would cause warnings about conformant programs. Nonconformant 151 * programs can avoid the warnings by casting to (__sighandler_t *) or 152 * sig_t before calling signal() or assigning to sa_handler or sv_handler. 153 * 154 * The kernel should reverse the cast before calling the function. It 155 * has no way to do this, but on most machines 1-arg and 3-arg functions 156 * have the same calling protocol so there is no problem in practice. 157 * A bit in sa_flags could be used to specify the number of args. 158 */ 159typedef void __sighandler_t(int); 160 161#if __POSIX_VISIBLE || __XSI_VISIBLE 162#ifndef _SIGSET_T_DECLARED 163#define _SIGSET_T_DECLARED 164typedef __sigset_t sigset_t; 165#endif 166#endif 167 168#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500 169union sigval { 170 /* Members as suggested by Annex C of POSIX 1003.1b. */ 171 int sival_int; 172 void *sival_ptr; 173 /* 6.0 compatibility */ 174 int sigval_int; 175 void *sigval_ptr; 176}; 177 178#if defined(_WANT_LWPINFO32) || (defined(_KERNEL) && defined(__LP64__)) 179union sigval32 { 180 int sival_int; 181 uint32_t sival_ptr; 182 /* 6.0 compatibility */ 183 int sigval_int; 184 uint32_t sigval_ptr; 185}; 186#endif 187#endif 188 189#if __POSIX_VISIBLE >= 199309 190 191struct pthread_attr; 192 193struct sigevent { 194 int sigev_notify; /* Notification type */ 195 int sigev_signo; /* Signal number */ 196 union sigval sigev_value; /* Signal value */ 197 union { 198 __lwpid_t _threadid; 199 struct { 200 void (*_function)(union sigval); 201 struct pthread_attr **_attribute; 202 } _sigev_thread; 203 unsigned short _kevent_flags; 204 long __spare__[8]; 205 } _sigev_un; 206}; 207 208#if __BSD_VISIBLE 209#define sigev_notify_kqueue sigev_signo 210#define sigev_notify_kevent_flags _sigev_un._kevent_flags 211#define sigev_notify_thread_id _sigev_un._threadid 212#endif 213#define sigev_notify_function _sigev_un._sigev_thread._function 214#define sigev_notify_attributes _sigev_un._sigev_thread._attribute 215 216#define SIGEV_NONE 0 /* No async notification. */ 217#define SIGEV_SIGNAL 1 /* Generate a queued signal. */ 218#define SIGEV_THREAD 2 /* Call back from another pthread. */ 219#if __BSD_VISIBLE 220#define SIGEV_KEVENT 3 /* Generate a kevent. */ 221#define SIGEV_THREAD_ID 4 /* Send signal to a kernel thread. */ 222#endif 223 224#endif /* __POSIX_VISIBLE >= 199309 */ 225 226#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE 227typedef struct __siginfo { 228 int si_signo; /* signal number */ 229 int si_errno; /* errno association */ 230 /* 231 * Cause of signal, one of the SI_ macros or signal-specific 232 * values, i.e. one of the FPE_... values for SIGFPE. This 233 * value is equivalent to the second argument to an old-style 234 * FreeBSD signal handler. 235 */ 236 int si_code; /* signal code */ 237 __pid_t si_pid; /* sending process */ 238 __uid_t si_uid; /* sender's ruid */ 239 int si_status; /* exit value */ 240 void *si_addr; /* faulting instruction */ 241 union sigval si_value; /* signal value */ 242 union { 243 struct { 244 int _trapno;/* machine specific trap code */ 245 } _fault; 246 struct { 247 int _timerid; 248 int _overrun; 249 } _timer; 250 struct { 251 int _mqd; 252 } _mesgq; 253 struct { 254 long _band; /* band event for SIGPOLL */ 255 } _poll; /* was this ever used ? */ 256 struct { 257 long __spare1__; 258 int __spare2__[7]; 259 } __spare__; 260 } _reason; 261} siginfo_t; 262 263#define si_trapno _reason._fault._trapno 264#define si_timerid _reason._timer._timerid 265#define si_overrun _reason._timer._overrun 266#define si_mqd _reason._mesgq._mqd 267#define si_band _reason._poll._band 268 269#if defined(_WANT_LWPINFO32) || (defined(_KERNEL) && defined(__LP64__)) 270struct siginfo32 { 271 int si_signo; /* signal number */ 272 int si_errno; /* errno association */ 273 int si_code; /* signal code */ 274 __pid_t si_pid; /* sending process */ 275 __uid_t si_uid; /* sender's ruid */ 276 int si_status; /* exit value */ 277 uint32_t si_addr; /* faulting instruction */ 278 union sigval32 si_value; /* signal value */ 279 union { 280 struct { 281 int _trapno;/* machine specific trap code */ 282 } _fault; 283 struct { 284 int _timerid; 285 int _overrun; 286 } _timer; 287 struct { 288 int _mqd; 289 } _mesgq; 290 struct { 291 int32_t _band; /* band event for SIGPOLL */ 292 } _poll; /* was this ever used ? */ 293 struct { 294 int32_t __spare1__; 295 int __spare2__[7]; 296 } __spare__; 297 } _reason; 298}; 299#endif 300 301/** si_code **/ 302/* codes for SIGILL */ 303#define ILL_ILLOPC 1 /* Illegal opcode. */ 304#define ILL_ILLOPN 2 /* Illegal operand. */ 305#define ILL_ILLADR 3 /* Illegal addressing mode. */ 306#define ILL_ILLTRP 4 /* Illegal trap. */ 307#define ILL_PRVOPC 5 /* Privileged opcode. */ 308#define ILL_PRVREG 6 /* Privileged register. */ 309#define ILL_COPROC 7 /* Coprocessor error. */ 310#define ILL_BADSTK 8 /* Internal stack error. */ 311 312/* codes for SIGBUS */ 313#define BUS_ADRALN 1 /* Invalid address alignment. */ 314#define BUS_ADRERR 2 /* Nonexistent physical address. */ 315#define BUS_OBJERR 3 /* Object-specific hardware error. */ 316 317/* codes for SIGSEGV */ 318#define SEGV_MAPERR 1 /* Address not mapped to object. */ 319#define SEGV_ACCERR 2 /* Invalid permissions for mapped */ 320 /* object. */ 321 322/* codes for SIGFPE */ 323#define FPE_INTOVF 1 /* Integer overflow. */ 324#define FPE_INTDIV 2 /* Integer divide by zero. */ 325#define FPE_FLTDIV 3 /* Floating point divide by zero. */ 326#define FPE_FLTOVF 4 /* Floating point overflow. */ 327#define FPE_FLTUND 5 /* Floating point underflow. */ 328#define FPE_FLTRES 6 /* Floating point inexact result. */ 329#define FPE_FLTINV 7 /* Invalid floating point operation. */ 330#define FPE_FLTSUB 8 /* Subscript out of range. */ 331 332/* codes for SIGTRAP */ 333#define TRAP_BRKPT 1 /* Process breakpoint. */ 334#define TRAP_TRACE 2 /* Process trace trap. */ 335#define TRAP_DTRACE 3 /* DTrace induced trap. */ 336#define TRAP_CAP 4 /* Capabilities protective trap. */ 337 338/* codes for SIGCHLD */ 339#define CLD_EXITED 1 /* Child has exited */ 340#define CLD_KILLED 2 /* Child has terminated abnormally but */ 341 /* did not create a core file */ 342#define CLD_DUMPED 3 /* Child has terminated abnormally and */ 343 /* created a core file */ 344#define CLD_TRAPPED 4 /* Traced child has trapped */ 345#define CLD_STOPPED 5 /* Child has stopped */ 346#define CLD_CONTINUED 6 /* Stopped child has continued */ 347 348/* codes for SIGPOLL */ 349#define POLL_IN 1 /* Data input available */ 350#define POLL_OUT 2 /* Output buffers available */ 351#define POLL_MSG 3 /* Input message available */ 352#define POLL_ERR 4 /* I/O Error */ 353#define POLL_PRI 5 /* High priority input available */ 354#define POLL_HUP 6 /* Device disconnected */ 355 356#endif 357 358#if __POSIX_VISIBLE || __XSI_VISIBLE 359struct __siginfo; 360 361/* 362 * Signal vector "template" used in sigaction call. 363 */ 364struct sigaction { 365 union { 366 void (*__sa_handler)(int); 367 void (*__sa_sigaction)(int, struct __siginfo *, void *); 368 } __sigaction_u; /* signal handler */ 369 int sa_flags; /* see signal options below */ 370 sigset_t sa_mask; /* signal mask to apply */ 371}; 372 373#define sa_handler __sigaction_u.__sa_handler 374#endif 375 376#if __XSI_VISIBLE 377/* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */ 378#define sa_sigaction __sigaction_u.__sa_sigaction 379#endif 380 381#if __POSIX_VISIBLE || __XSI_VISIBLE 382#define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ 383#endif /* __POSIX_VISIBLE || __XSI_VISIBLE */ 384 385#if __XSI_VISIBLE 386#define SA_ONSTACK 0x0001 /* take signal on signal stack */ 387#define SA_RESTART 0x0002 /* restart system call on signal return */ 388#define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ 389#define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ 390#define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */ 391#define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */ 392#endif 393 394#if __BSD_VISIBLE 395#define NSIG 32 /* number of old signals (counting 0) */ 396#endif 397 398#if __POSIX_VISIBLE || __XSI_VISIBLE 399#define SI_NOINFO 0 /* No signal info besides si_signo. */ 400#define SI_USER 0x10001 /* Signal sent by kill(). */ 401#define SI_QUEUE 0x10002 /* Signal sent by the sigqueue(). */ 402#define SI_TIMER 0x10003 /* Signal generated by expiration of */ 403 /* a timer set by timer_settime(). */ 404#define SI_ASYNCIO 0x10004 /* Signal generated by completion of */ 405 /* an asynchronous I/O request.*/ 406#define SI_MESGQ 0x10005 /* Signal generated by arrival of a */ 407 /* message on an empty message queue. */ 408#define SI_KERNEL 0x10006 409#define SI_LWP 0x10007 /* Signal sent by thr_kill */ 410#endif 411#if __BSD_VISIBLE 412#define SI_UNDEFINED 0 413#endif 414 415#if __BSD_VISIBLE 416typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 417typedef void __siginfohandler_t(int, struct __siginfo *, void *); 418#endif 419 420#if __XSI_VISIBLE 421#if __BSD_VISIBLE 422#define __stack_t sigaltstack 423#endif 424typedef struct __stack_t stack_t; 425 426#define SS_ONSTACK 0x0001 /* take signal on alternate stack */ 427#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ 428#define MINSIGSTKSZ __MINSIGSTKSZ /* minimum stack size */ 429#define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */ 430#endif 431 432/* 433 * Structure used in sigaltstack call. Its definition is always 434 * needed for __ucontext. If __BSD_VISIBLE is defined, the structure 435 * tag is actually sigaltstack. 436 */ 437struct __stack_t { 438 void *ss_sp; /* signal stack base */ 439 __size_t ss_size; /* signal stack length */ 440 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */ 441}; 442 443#if __BSD_VISIBLE 444/* 445 * 4.3 compatibility: 446 * Signal vector "template" used in sigvec call. 447 */ 448struct sigvec { 449 __sighandler_t *sv_handler; /* signal handler */ 450 int sv_mask; /* signal mask to apply */ 451 int sv_flags; /* see signal options below */ 452}; 453 454#define SV_ONSTACK SA_ONSTACK 455#define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ 456#define SV_RESETHAND SA_RESETHAND 457#define SV_NODEFER SA_NODEFER 458#define SV_NOCLDSTOP SA_NOCLDSTOP 459#define SV_SIGINFO SA_SIGINFO 460#define sv_onstack sv_flags /* isn't compatibility wonderful! */ 461#endif 462 463/* Keep this in one place only */ 464#if defined(_KERNEL) && defined(COMPAT_43) && \ 465 !defined(__i386__) 466struct osigcontext { 467 int _not_used; 468}; 469#endif 470 471#if __XSI_VISIBLE 472/* 473 * Structure used in sigstack call. 474 */ 475struct sigstack { 476 void *ss_sp; /* signal stack pointer */ 477 int ss_onstack; /* current status */ 478}; 479#endif 480 481#if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112 482/* 483 * Macro for converting signal number to a mask suitable for 484 * sigblock(). 485 */ 486#define sigmask(m) (1 << ((m)-1)) 487#endif 488 489#if __BSD_VISIBLE 490#define BADSIG SIG_ERR 491#endif 492 493#if __POSIX_VISIBLE || __XSI_VISIBLE 494/* 495 * Flags for sigprocmask: 496 */ 497#define SIG_BLOCK 1 /* block specified signal set */ 498#define SIG_UNBLOCK 2 /* unblock specified signal set */ 499#define SIG_SETMASK 3 /* set specified signal set */ 500#endif 501 502/* 503 * For historical reasons; programs expect signal's return value to be 504 * defined by <sys/signal.h>. 505 */ 506__BEGIN_DECLS 507__sighandler_t *signal(int, __sighandler_t *); 508__END_DECLS 509 510#endif /* !_SYS_SIGNAL_H_ */ 511