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 */ 38 39 #ifndef _SYS_SIGNAL_H_ 40 #define _SYS_SIGNAL_H_ 41 42 #include <sys/cdefs.h> 43 #include <sys/_types.h> 44 #include <sys/_sigset.h> 45 #include <sys/_sigval.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 171 172 struct pthread_attr; 173 174 struct sigevent { 175 int sigev_notify; /* Notification type */ 176 int sigev_signo; /* Signal number */ 177 union sigval sigev_value; /* Signal value */ 178 union { 179 __lwpid_t _threadid; 180 struct { 181 void (*_function)(union sigval); 182 struct pthread_attr **_attribute; 183 } _sigev_thread; 184 unsigned short _kevent_flags; 185 long __spare__[8]; 186 } _sigev_un; 187 }; 188 189 #if __BSD_VISIBLE 190 #define sigev_notify_kqueue sigev_signo 191 #define sigev_notify_kevent_flags _sigev_un._kevent_flags 192 #define sigev_notify_thread_id _sigev_un._threadid 193 #endif 194 #define sigev_notify_function _sigev_un._sigev_thread._function 195 #define sigev_notify_attributes _sigev_un._sigev_thread._attribute 196 197 #define SIGEV_NONE 0 /* No async notification. */ 198 #define SIGEV_SIGNAL 1 /* Generate a queued signal. */ 199 #define SIGEV_THREAD 2 /* Call back from another pthread. */ 200 #if __BSD_VISIBLE 201 #define SIGEV_KEVENT 3 /* Generate a kevent. */ 202 #define SIGEV_THREAD_ID 4 /* Send signal to a kernel thread. */ 203 #endif 204 205 #endif /* __POSIX_VISIBLE >= 199309 */ 206 207 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE 208 typedef struct __siginfo { 209 int si_signo; /* signal number */ 210 int si_errno; /* errno association */ 211 /* 212 * Cause of signal, one of the SI_ macros or signal-specific 213 * values, i.e. one of the FPE_... values for SIGFPE. This 214 * value is equivalent to the second argument to an old-style 215 * FreeBSD signal handler. 216 */ 217 int si_code; /* signal code */ 218 __pid_t si_pid; /* sending process */ 219 __uid_t si_uid; /* sender's ruid */ 220 int si_status; /* exit value */ 221 void *si_addr; /* faulting instruction */ 222 union sigval si_value; /* signal value */ 223 union { 224 struct { 225 int _trapno;/* machine specific trap code */ 226 } _fault; 227 struct { 228 int _timerid; 229 int _overrun; 230 } _timer; 231 struct { 232 int _mqd; 233 } _mesgq; 234 struct { 235 long _band; /* band event for SIGPOLL */ 236 } _poll; /* was this ever used ? */ 237 struct { 238 int _syscall; /* Syscall number for signals 239 * delivered as a result of 240 * system calls denied by 241 * Capsicum. */ 242 } _capsicum; 243 struct { 244 long __spare1__; 245 int __spare2__[7]; 246 } __spare__; 247 } _reason; 248 } siginfo_t; 249 250 #define si_trapno _reason._fault._trapno 251 #define si_timerid _reason._timer._timerid 252 #define si_overrun _reason._timer._overrun 253 #define si_mqd _reason._mesgq._mqd 254 #define si_band _reason._poll._band 255 #define si_syscall _reason._capsicum._syscall 256 257 #if defined(_WANT_LWPINFO32) || (defined(_KERNEL) && defined(__LP64__)) 258 struct siginfo32 { 259 int si_signo; /* signal number */ 260 int si_errno; /* errno association */ 261 int si_code; /* signal code */ 262 __pid_t si_pid; /* sending process */ 263 __uid_t si_uid; /* sender's ruid */ 264 int si_status; /* exit value */ 265 uint32_t si_addr; /* faulting instruction */ 266 union sigval32 si_value; /* signal value */ 267 union { 268 struct { 269 int _trapno;/* machine specific trap code */ 270 } _fault; 271 struct { 272 int _timerid; 273 int _overrun; 274 } _timer; 275 struct { 276 int _mqd; 277 } _mesgq; 278 struct { 279 int32_t _band; /* band event for SIGPOLL */ 280 } _poll; /* was this ever used ? */ 281 struct { 282 int32_t __spare1__; 283 int __spare2__[7]; 284 } __spare__; 285 } _reason; 286 }; 287 #endif 288 289 /** si_code **/ 290 /* codes for SIGILL */ 291 #define ILL_ILLOPC 1 /* Illegal opcode. */ 292 #define ILL_ILLOPN 2 /* Illegal operand. */ 293 #define ILL_ILLADR 3 /* Illegal addressing mode. */ 294 #define ILL_ILLTRP 4 /* Illegal trap. */ 295 #define ILL_PRVOPC 5 /* Privileged opcode. */ 296 #define ILL_PRVREG 6 /* Privileged register. */ 297 #define ILL_COPROC 7 /* Coprocessor error. */ 298 #define ILL_BADSTK 8 /* Internal stack error. */ 299 300 /* codes for SIGBUS */ 301 #define BUS_ADRALN 1 /* Invalid address alignment. */ 302 #define BUS_ADRERR 2 /* Nonexistent physical address. */ 303 #define BUS_OBJERR 3 /* Object-specific hardware error. */ 304 #define BUS_OOMERR 100 /* Non-standard: No memory. */ 305 306 /* codes for SIGSEGV */ 307 #define SEGV_MAPERR 1 /* Address not mapped to object. */ 308 #define SEGV_ACCERR 2 /* Invalid permissions for mapped */ 309 /* object. */ 310 #define SEGV_PKUERR 100 /* x86: PKU violation */ 311 312 /* codes for SIGFPE */ 313 #define FPE_INTOVF 1 /* Integer overflow. */ 314 #define FPE_INTDIV 2 /* Integer divide by zero. */ 315 #define FPE_FLTDIV 3 /* Floating point divide by zero. */ 316 #define FPE_FLTOVF 4 /* Floating point overflow. */ 317 #define FPE_FLTUND 5 /* Floating point underflow. */ 318 #define FPE_FLTRES 6 /* Floating point inexact result. */ 319 #define FPE_FLTINV 7 /* Invalid floating point operation. */ 320 #define FPE_FLTSUB 8 /* Subscript out of range. */ 321 #define FPE_FLTIDO 9 /* Input denormal operation */ 322 323 /* codes for SIGTRAP */ 324 #define TRAP_BRKPT 1 /* Process breakpoint. */ 325 #define TRAP_TRACE 2 /* Process trace trap. */ 326 #define TRAP_DTRACE 3 /* DTrace induced trap. */ 327 #define TRAP_CAP 4 /* Capabilities protective trap. */ 328 329 /* codes for SIGCHLD */ 330 #define CLD_EXITED 1 /* Child has exited */ 331 #define CLD_KILLED 2 /* Child has terminated abnormally but */ 332 /* did not create a core file */ 333 #define CLD_DUMPED 3 /* Child has terminated abnormally and */ 334 /* created a core file */ 335 #define CLD_TRAPPED 4 /* Traced child has trapped */ 336 #define CLD_STOPPED 5 /* Child has stopped */ 337 #define CLD_CONTINUED 6 /* Stopped child has continued */ 338 339 /* codes for SIGPOLL */ 340 #define POLL_IN 1 /* Data input available */ 341 #define POLL_OUT 2 /* Output buffers available */ 342 #define POLL_MSG 3 /* Input message available */ 343 #define POLL_ERR 4 /* I/O Error */ 344 #define POLL_PRI 5 /* High priority input available */ 345 #define POLL_HUP 6 /* Device disconnected */ 346 347 #endif 348 349 #if __POSIX_VISIBLE || __XSI_VISIBLE 350 struct __siginfo; 351 352 /* 353 * Signal vector "template" used in sigaction call. 354 */ 355 struct sigaction { 356 union { 357 void (*__sa_handler)(int); 358 void (*__sa_sigaction)(int, struct __siginfo *, void *); 359 } __sigaction_u; /* signal handler */ 360 int sa_flags; /* see signal options below */ 361 sigset_t sa_mask; /* signal mask to apply */ 362 }; 363 364 #define sa_handler __sigaction_u.__sa_handler 365 #endif 366 367 #if __XSI_VISIBLE 368 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */ 369 #define sa_sigaction __sigaction_u.__sa_sigaction 370 #endif 371 372 #if __POSIX_VISIBLE || __XSI_VISIBLE 373 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */ 374 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */ 375 376 #if __XSI_VISIBLE || __POSIX_VISIBLE >= 200809 377 #define SA_ONSTACK 0x0001 /* take signal on signal stack */ 378 #define SA_RESTART 0x0002 /* restart system call on signal return */ 379 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */ 380 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */ 381 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */ 382 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */ 383 #endif 384 385 #if __BSD_VISIBLE 386 #define NSIG 32 /* number of old signals (counting 0) */ 387 #endif 388 389 #if __POSIX_VISIBLE || __XSI_VISIBLE 390 #define SI_NOINFO 0 /* No signal info besides si_signo. */ 391 #define SI_USER 0x10001 /* Signal sent by kill(). */ 392 #define SI_QUEUE 0x10002 /* Signal sent by the sigqueue(). */ 393 #define SI_TIMER 0x10003 /* Signal generated by expiration of */ 394 /* a timer set by timer_settime(). */ 395 #define SI_ASYNCIO 0x10004 /* Signal generated by completion of */ 396 /* an asynchronous I/O request.*/ 397 #define SI_MESGQ 0x10005 /* Signal generated by arrival of a */ 398 /* message on an empty message queue. */ 399 #define SI_KERNEL 0x10006 400 #define SI_LWP 0x10007 /* Signal sent by thr_kill */ 401 #endif 402 #if __BSD_VISIBLE 403 #define SI_UNDEFINED 0 404 #endif 405 406 #if __BSD_VISIBLE 407 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */ 408 typedef void __siginfohandler_t(int, struct __siginfo *, void *); 409 #endif 410 411 #if __XSI_VISIBLE 412 #if __BSD_VISIBLE 413 #define __stack_t sigaltstack 414 #endif 415 typedef struct __stack_t stack_t; 416 417 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */ 418 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */ 419 #define MINSIGSTKSZ __MINSIGSTKSZ /* minimum stack size */ 420 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */ 421 #endif 422 423 /* 424 * Structure used in sigaltstack call. Its definition is always 425 * needed for __ucontext. If __BSD_VISIBLE is defined, the structure 426 * tag is actually sigaltstack. 427 */ 428 struct __stack_t { 429 void *ss_sp; /* signal stack base */ 430 __size_t ss_size; /* signal stack length */ 431 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */ 432 }; 433 434 #if __BSD_VISIBLE 435 /* 436 * 4.3 compatibility: 437 * Signal vector "template" used in sigvec call. 438 */ 439 struct sigvec { 440 __sighandler_t *sv_handler; /* signal handler */ 441 int sv_mask; /* signal mask to apply */ 442 int sv_flags; /* see signal options below */ 443 }; 444 445 #define SV_ONSTACK SA_ONSTACK 446 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */ 447 #define SV_RESETHAND SA_RESETHAND 448 #define SV_NODEFER SA_NODEFER 449 #define SV_NOCLDSTOP SA_NOCLDSTOP 450 #define SV_SIGINFO SA_SIGINFO 451 #define sv_onstack sv_flags /* isn't compatibility wonderful! */ 452 #endif 453 454 /* Keep this in one place only */ 455 #if defined(_KERNEL) && defined(COMPAT_43) && \ 456 !defined(__i386__) 457 struct osigcontext { 458 int _not_used; 459 }; 460 #endif 461 462 #if __XSI_VISIBLE 463 /* 464 * Structure used in sigstack call. 465 */ 466 struct sigstack { 467 void *ss_sp; /* signal stack pointer */ 468 int ss_onstack; /* current status */ 469 }; 470 #endif 471 472 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112 473 /* 474 * Macro for converting signal number to a mask suitable for 475 * sigblock(). 476 */ 477 #define sigmask(m) (1 << ((m)-1)) 478 #endif 479 480 #if __BSD_VISIBLE 481 #define BADSIG SIG_ERR 482 483 /* sigqueue(2) signo high-bits flags */ 484 #define __SIGQUEUE_TID 0x80000000 /* queue for tid, instead of pid */ 485 #define __SIGQUEUE_RSRV 0x40000000 /* reserved */ 486 #endif 487 488 #if __POSIX_VISIBLE || __XSI_VISIBLE 489 /* 490 * Flags for sigprocmask: 491 */ 492 #define SIG_BLOCK 1 /* block specified signal set */ 493 #define SIG_UNBLOCK 2 /* unblock specified signal set */ 494 #define SIG_SETMASK 3 /* set specified signal set */ 495 #endif 496 497 /* 498 * For historical reasons; programs expect signal's return value to be 499 * defined by <sys/signal.h>. 500 */ 501 __BEGIN_DECLS 502 __sighandler_t *signal(int, __sighandler_t *); 503 __END_DECLS 504 505 #endif /* !_SYS_SIGNAL_H_ */ 506