signal.h revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1989, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)signal.h 8.4 (Berkeley) 5/4/95 37 * $FreeBSD: stable/11/sys/sys/signal.h 330897 2018-03-14 03:19:51Z eadler $ 38 */ 39 40#ifndef _SYS_SIGNAL_H_ 41#define _SYS_SIGNAL_H_ 42 43#include <sys/cdefs.h> 44#include <sys/_types.h> 45#include <sys/_sigset.h> 46 47#include <machine/_limits.h> /* __MINSIGSTKSZ */ 48#include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */ 49 50#if __POSIX_VISIBLE >= 200809 51 52#include <sys/_pthreadtypes.h> 53#include <sys/_timespec.h> 54 55#ifndef _SIZE_T_DECLARED 56typedef __size_t size_t; 57#define _SIZE_T_DECLARED 58#endif 59 60#ifndef _UID_T_DECLARED 61typedef __uid_t uid_t; 62#define _UID_T_DECLARED 63#endif 64 65#endif /* __POSIX_VISIBLE >= 200809 */ 66 67/* 68 * System defined signals. 69 */ 70#if __POSIX_VISIBLE || __XSI_VISIBLE 71#define SIGHUP 1 /* hangup */ 72#endif 73#define SIGINT 2 /* interrupt */ 74#if __POSIX_VISIBLE || __XSI_VISIBLE 75#define SIGQUIT 3 /* quit */ 76#endif 77#define SIGILL 4 /* illegal instr. (not reset when caught) */ 78#if __XSI_VISIBLE 79#define SIGTRAP 5 /* trace trap (not reset when caught) */ 80#endif 81#define SIGABRT 6 /* abort() */ 82#if __BSD_VISIBLE 83#define SIGIOT SIGABRT /* compatibility */ 84#define SIGEMT 7 /* EMT instruction */ 85#endif 86#define SIGFPE 8 /* floating point exception */ 87#if __POSIX_VISIBLE || __XSI_VISIBLE 88#define SIGKILL 9 /* kill (cannot be caught or ignored) */ 89#endif 90#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 91#define SIGBUS 10 /* bus error */ 92#endif 93#define SIGSEGV 11 /* segmentation violation */ 94#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 95#define SIGSYS 12 /* non-existent system call invoked */ 96#endif 97#if __POSIX_VISIBLE || __XSI_VISIBLE 98#define SIGPIPE 13 /* write on a pipe with no one to read it */ 99#define SIGALRM 14 /* alarm clock */ 100#endif 101#define SIGTERM 15 /* software termination signal from kill */ 102#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 103#define SIGURG 16 /* urgent condition on IO channel */ 104#endif 105#if __POSIX_VISIBLE || __XSI_VISIBLE 106#define SIGSTOP 17 /* sendable stop signal not from tty */ 107#define SIGTSTP 18 /* stop signal from tty */ 108#define SIGCONT 19 /* continue a stopped process */ 109#define SIGCHLD 20 /* to parent on child stop or exit */ 110#define SIGTTIN 21 /* to readers pgrp upon background tty read */ 111#define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */ 112#endif 113#if __BSD_VISIBLE 114#define SIGIO 23 /* input/output possible signal */ 115#endif 116#if __XSI_VISIBLE 117#define SIGXCPU 24 /* exceeded CPU time limit */ 118#define SIGXFSZ 25 /* exceeded file size limit */ 119#define SIGVTALRM 26 /* virtual time alarm */ 120#define SIGPROF 27 /* profiling time alarm */ 121#endif 122#if __BSD_VISIBLE 123#define SIGWINCH 28 /* window size changes */ 124#define SIGINFO 29 /* information request */ 125#endif 126#if __POSIX_VISIBLE || __XSI_VISIBLE 127#define SIGUSR1 30 /* user defined signal 1 */ 128#define SIGUSR2 31 /* user defined signal 2 */ 129#endif 130#if __BSD_VISIBLE 131#define SIGTHR 32 /* reserved by thread library. */ 132#define SIGLWP SIGTHR 133#define SIGLIBRT 33 /* reserved by real-time library. */ 134#endif 135 136#define SIGRTMIN 65 137#define SIGRTMAX 126 138 139#define SIG_DFL ((__sighandler_t *)0) 140#define SIG_IGN ((__sighandler_t *)1) 141#define SIG_ERR ((__sighandler_t *)-1) 142/* #define SIG_CATCH ((__sighandler_t *)2) See signalvar.h */ 143#define SIG_HOLD ((__sighandler_t *)3) 144 145/* 146 * Type of a signal handling function. 147 * 148 * Language spec sez signal handlers take exactly one arg, even though we 149 * actually supply three. Ugh! 150 * 151 * We don't try to hide the difference by leaving out the args because 152 * that would cause warnings about conformant programs. Nonconformant 153 * programs can avoid the warnings by casting to (__sighandler_t *) or 154 * sig_t before calling signal() or assigning to sa_handler or sv_handler. 155 * 156 * The kernel should reverse the cast before calling the function. It 157 * has no way to do this, but on most machines 1-arg and 3-arg functions 158 * have the same calling protocol so there is no problem in practice. 159 * A bit in sa_flags could be used to specify the number of args. 160 */ 161typedef void __sighandler_t(int); 162 163#if __POSIX_VISIBLE || __XSI_VISIBLE 164#ifndef _SIGSET_T_DECLARED 165#define _SIGSET_T_DECLARED 166typedef __sigset_t sigset_t; 167#endif 168#endif 169 170#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500 171union sigval { 172 /* Members as suggested by Annex C of POSIX 1003.1b. */ 173 int sival_int; 174 void *sival_ptr; 175 /* 6.0 compatibility */ 176 int sigval_int; 177 void *sigval_ptr; 178}; 179 180#if defined(_WANT_LWPINFO32) || (defined(_KERNEL) && defined(__LP64__)) 181union sigval32 { 182 int sival_int; 183 uint32_t sival_ptr; 184 /* 6.0 compatibility */ 185 int sigval_int; 186 uint32_t sigval_ptr; 187}; 188#endif 189#endif 190 191#if __POSIX_VISIBLE >= 199309 192 193struct pthread_attr; 194 195struct sigevent { 196 int sigev_notify; /* Notification type */ 197 int sigev_signo; /* Signal number */ 198 union sigval sigev_value; /* Signal value */ 199 union { 200 __lwpid_t _threadid; 201 struct { 202 void (*_function)(union sigval); 203 struct pthread_attr **_attribute; 204 } _sigev_thread; 205 unsigned short _kevent_flags; 206 long __spare__[8]; 207 } _sigev_un; 208}; 209 210#if __BSD_VISIBLE 211#define sigev_notify_kqueue sigev_signo 212#define sigev_notify_kevent_flags _sigev_un._kevent_flags 213#define sigev_notify_thread_id _sigev_un._threadid 214#endif 215#define sigev_notify_function _sigev_un._sigev_thread._function 216#define sigev_notify_attributes _sigev_un._sigev_thread._attribute 217 218#define SIGEV_NONE 0 /* No async notification. */ 219#define SIGEV_SIGNAL 1 /* Generate a queued signal. */ 220#define SIGEV_THREAD 2 /* Call back from another pthread. */ 221#if __BSD_VISIBLE 222#define SIGEV_KEVENT 3 /* Generate a kevent. */ 223#define SIGEV_THREAD_ID 4 /* Send signal to a kernel thread. */ 224#endif 225 226#endif /* __POSIX_VISIBLE >= 199309 */ 227 228#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE 229typedef struct __siginfo { 230 int si_signo; /* signal number */ 231 int si_errno; /* errno association */ 232 /* 233 * Cause of signal, one of the SI_ macros or signal-specific 234 * values, i.e. one of the FPE_... values for SIGFPE. This 235 * value is equivalent to the second argument to an old-style 236 * FreeBSD signal handler. 237 */ 238 int si_code; /* signal code */ 239 __pid_t si_pid; /* sending process */ 240 __uid_t si_uid; /* sender's ruid */ 241 int si_status; /* exit value */ 242 void *si_addr; /* faulting instruction */ 243 union sigval si_value; /* signal value */ 244 union { 245 struct { 246 int _trapno;/* machine specific trap code */ 247 } _fault; 248 struct { 249 int _timerid; 250 int _overrun; 251 } _timer; 252 struct { 253 int _mqd; 254 } _mesgq; 255 struct { 256 long _band; /* band event for SIGPOLL */ 257 } _poll; /* was this ever used ? */ 258 struct { 259 long __spare1__; 260 int __spare2__[7]; 261 } __spare__; 262 } _reason; 263} siginfo_t; 264 265#define si_trapno _reason._fault._trapno 266#define si_timerid _reason._timer._timerid 267#define si_overrun _reason._timer._overrun 268#define si_mqd _reason._mesgq._mqd 269#define si_band _reason._poll._band 270 271#if defined(_WANT_LWPINFO32) || (defined(_KERNEL) && defined(__LP64__)) 272struct siginfo32 { 273 int si_signo; /* signal number */ 274 int si_errno; /* errno association */ 275 int si_code; /* signal code */ 276 __pid_t si_pid; /* sending process */ 277 __uid_t si_uid; /* sender's ruid */ 278 int si_status; /* exit value */ 279 uint32_t si_addr; /* faulting instruction */ 280 union sigval32 si_value; /* signal value */ 281 union { 282 struct { 283 int _trapno;/* machine specific trap code */ 284 } _fault; 285 struct { 286 int _timerid; 287 int _overrun; 288 } _timer; 289 struct { 290 int _mqd; 291 } _mesgq; 292 struct { 293 int32_t _band; /* band event for SIGPOLL */ 294 } _poll; /* was this ever used ? */ 295 struct { 296 int32_t __spare1__; 297 int __spare2__[7]; 298 } __spare__; 299 } _reason; 300}; 301#endif 302 303/** si_code **/ 304/* codes for SIGILL */ 305#define ILL_ILLOPC 1 /* Illegal opcode. */ 306#define ILL_ILLOPN 2 /* Illegal operand. */ 307#define ILL_ILLADR 3 /* Illegal addressing mode. */ 308#define ILL_ILLTRP 4 /* Illegal trap. */ 309#define ILL_PRVOPC 5 /* Privileged opcode. */ 310#define ILL_PRVREG 6 /* Privileged register. */ 311#define ILL_COPROC 7 /* Coprocessor error. */ 312#define ILL_BADSTK 8 /* Internal stack error. */ 313 314/* codes for SIGBUS */ 315#define BUS_ADRALN 1 /* Invalid address alignment. */ 316#define BUS_ADRERR 2 /* Nonexistent physical address. */ 317#define BUS_OBJERR 3 /* Object-specific hardware error. */ 318 319/* codes for SIGSEGV */ 320#define SEGV_MAPERR 1 /* Address not mapped to object. */ 321#define SEGV_ACCERR 2 /* Invalid permissions for mapped */ 322 /* object. */ 323 324/* codes for SIGFPE */ 325#define FPE_INTOVF 1 /* Integer overflow. */ 326#define FPE_INTDIV 2 /* Integer divide by zero. */ 327#define FPE_FLTDIV 3 /* Floating point divide by zero. */ 328#define FPE_FLTOVF 4 /* Floating point overflow. */ 329#define FPE_FLTUND 5 /* Floating point underflow. */ 330#define FPE_FLTRES 6 /* Floating point inexact result. */ 331#define FPE_FLTINV 7 /* Invalid floating point operation. */ 332#define FPE_FLTSUB 8 /* Subscript out of range. */ 333 334/* codes for SIGTRAP */ 335#define TRAP_BRKPT 1 /* Process breakpoint. */ 336#define TRAP_TRACE 2 /* Process trace trap. */ 337#define TRAP_DTRACE 3 /* DTrace induced trap. */ 338#define TRAP_CAP 4 /* Capabilities protective trap. */ 339 340/* codes for SIGCHLD */ 341#define CLD_EXITED 1 /* Child has exited */ 342#define CLD_KILLED 2 /* Child has terminated abnormally but */ 343 /* did not create a core file */ 344#define CLD_DUMPED 3 /* Child has terminated abnormally and */ 345 /* created a core file */ 346#define CLD_TRAPPED 4 /* Traced child has trapped */ 347#define CLD_STOPPED 5 /* Child has stopped */ 348#define CLD_CONTINUED 6 /* Stopped child has continued */ 349 350/* codes for SIGPOLL */ 351#define POLL_IN 1 /* Data input available */ 352#define POLL_OUT 2 /* Output buffers available */ 353#define POLL_MSG 3 /* Input message available */ 354#define POLL_ERR 4 /* I/O Error */ 355#define POLL_PRI 5 /* High priority input available */ 356#define POLL_HUP 6 /* Device disconnected */ 357 358#endif 359 360#if __POSIX_VISIBLE || __XSI_VISIBLE 361struct __siginfo; 362 363/* 364 * Signal vector "template" used in sigaction call. 365 */ 366struct sigaction { 367 union { 368 void (*__sa_handler)(int); 369 void (*__sa_sigaction)(int, struct __siginfo *, void *); 370 } __sigaction_u; /* signal handler */ 371 int sa_flags; /* see signal options below */ 372 sigset_t sa_mask; /* signal mask to apply */ 373}; 374 375#define sa_handler __sigaction_u.__sa_handler 376#endif 377 378#if __XSI_VISIBLE 379/* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */ 380#define sa_sigaction __sigaction_u.__sa_sigaction 381#endif 382 383#if __POSIX_VISIBLE || __XSI_VISIBLE 384#define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ 385#endif /* __POSIX_VISIBLE || __XSI_VISIBLE */ 386 387#if __XSI_VISIBLE 388#define SA_ONSTACK 0x0001 /* take signal on signal stack */ 389#define SA_RESTART 0x0002 /* restart system call on signal return */ 390#define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ 391#define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ 392#define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */ 393#define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */ 394#endif 395 396#if __BSD_VISIBLE 397#define NSIG 32 /* number of old signals (counting 0) */ 398#endif 399 400#if __POSIX_VISIBLE || __XSI_VISIBLE 401#define SI_NOINFO 0 /* No signal info besides si_signo. */ 402#define SI_USER 0x10001 /* Signal sent by kill(). */ 403#define SI_QUEUE 0x10002 /* Signal sent by the sigqueue(). */ 404#define SI_TIMER 0x10003 /* Signal generated by expiration of */ 405 /* a timer set by timer_settime(). */ 406#define SI_ASYNCIO 0x10004 /* Signal generated by completion of */ 407 /* an asynchronous I/O request.*/ 408#define SI_MESGQ 0x10005 /* Signal generated by arrival of a */ 409 /* message on an empty message queue. */ 410#define SI_KERNEL 0x10006 411#define SI_LWP 0x10007 /* Signal sent by thr_kill */ 412#endif 413#if __BSD_VISIBLE 414#define SI_UNDEFINED 0 415#endif 416 417#if __BSD_VISIBLE 418typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 419typedef void __siginfohandler_t(int, struct __siginfo *, void *); 420#endif 421 422#if __XSI_VISIBLE 423#if __BSD_VISIBLE 424#define __stack_t sigaltstack 425#endif 426typedef struct __stack_t stack_t; 427 428#define SS_ONSTACK 0x0001 /* take signal on alternate stack */ 429#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ 430#define MINSIGSTKSZ __MINSIGSTKSZ /* minimum stack size */ 431#define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */ 432#endif 433 434/* 435 * Structure used in sigaltstack call. Its definition is always 436 * needed for __ucontext. If __BSD_VISIBLE is defined, the structure 437 * tag is actually sigaltstack. 438 */ 439struct __stack_t { 440 void *ss_sp; /* signal stack base */ 441 __size_t ss_size; /* signal stack length */ 442 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */ 443}; 444 445#if __BSD_VISIBLE 446/* 447 * 4.3 compatibility: 448 * Signal vector "template" used in sigvec call. 449 */ 450struct sigvec { 451 __sighandler_t *sv_handler; /* signal handler */ 452 int sv_mask; /* signal mask to apply */ 453 int sv_flags; /* see signal options below */ 454}; 455 456#define SV_ONSTACK SA_ONSTACK 457#define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ 458#define SV_RESETHAND SA_RESETHAND 459#define SV_NODEFER SA_NODEFER 460#define SV_NOCLDSTOP SA_NOCLDSTOP 461#define SV_SIGINFO SA_SIGINFO 462#define sv_onstack sv_flags /* isn't compatibility wonderful! */ 463#endif 464 465/* Keep this in one place only */ 466#if defined(_KERNEL) && defined(COMPAT_43) && \ 467 !defined(__i386__) 468struct osigcontext { 469 int _not_used; 470}; 471#endif 472 473#if __XSI_VISIBLE 474/* 475 * Structure used in sigstack call. 476 */ 477struct sigstack { 478 void *ss_sp; /* signal stack pointer */ 479 int ss_onstack; /* current status */ 480}; 481#endif 482 483#if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112 484/* 485 * Macro for converting signal number to a mask suitable for 486 * sigblock(). 487 */ 488#define sigmask(m) (1 << ((m)-1)) 489#endif 490 491#if __BSD_VISIBLE 492#define BADSIG SIG_ERR 493#endif 494 495#if __POSIX_VISIBLE || __XSI_VISIBLE 496/* 497 * Flags for sigprocmask: 498 */ 499#define SIG_BLOCK 1 /* block specified signal set */ 500#define SIG_UNBLOCK 2 /* unblock specified signal set */ 501#define SIG_SETMASK 3 /* set specified signal set */ 502#endif 503 504/* 505 * For historical reasons; programs expect signal's return value to be 506 * defined by <sys/signal.h>. 507 */ 508__BEGIN_DECLS 509__sighandler_t *signal(int, __sighandler_t *); 510__END_DECLS 511 512#endif /* !_SYS_SIGNAL_H_ */ 513