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 * 3. 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 * $FreeBSD$ 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 56 typedef __size_t size_t; 57 #define _SIZE_T_DECLARED 58 #endif 59 60 #ifndef _UID_T_DECLARED 61 typedef __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 */ 161 typedef void __sighandler_t(int); 162 163 #if __POSIX_VISIBLE || __XSI_VISIBLE 164 #ifndef _SIGSET_T_DECLARED 165 #define _SIGSET_T_DECLARED 166 typedef __sigset_t sigset_t; 167 #endif 168 #endif 169 170 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500 171 union 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__)) 181 union 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 192 193 struct pthread_attr; 194 195 struct 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 229 typedef 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__)) 272 struct 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 361 struct __siginfo; 362 363 /* 364 * Signal vector "template" used in sigaction call. 365 */ 366 struct 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 418 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 419 typedef 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 426 typedef 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 */ 439 struct __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 */ 450 struct 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__) 468 struct osigcontext { 469 int _not_used; 470 }; 471 #endif 472 473 #if __XSI_VISIBLE 474 /* 475 * Structure used in sigstack call. 476 */ 477 struct 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