FreeBSD/Linux Kernel Cross Reference
sys/sys/signal.h
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 #define BUS_OOMERR 100 /* Non-standard: No memory. */
319
320 /* codes for SIGSEGV */
321 #define SEGV_MAPERR 1 /* Address not mapped to object. */
322 #define SEGV_ACCERR 2 /* Invalid permissions for mapped */
323 /* object. */
324 #define SEGV_PKUERR 100 /* x86: PKU violation */
325
326 /* codes for SIGFPE */
327 #define FPE_INTOVF 1 /* Integer overflow. */
328 #define FPE_INTDIV 2 /* Integer divide by zero. */
329 #define FPE_FLTDIV 3 /* Floating point divide by zero. */
330 #define FPE_FLTOVF 4 /* Floating point overflow. */
331 #define FPE_FLTUND 5 /* Floating point underflow. */
332 #define FPE_FLTRES 6 /* Floating point inexact result. */
333 #define FPE_FLTINV 7 /* Invalid floating point operation. */
334 #define FPE_FLTSUB 8 /* Subscript out of range. */
335
336 /* codes for SIGTRAP */
337 #define TRAP_BRKPT 1 /* Process breakpoint. */
338 #define TRAP_TRACE 2 /* Process trace trap. */
339 #define TRAP_DTRACE 3 /* DTrace induced trap. */
340 #define TRAP_CAP 4 /* Capabilities protective trap. */
341
342 /* codes for SIGCHLD */
343 #define CLD_EXITED 1 /* Child has exited */
344 #define CLD_KILLED 2 /* Child has terminated abnormally but */
345 /* did not create a core file */
346 #define CLD_DUMPED 3 /* Child has terminated abnormally and */
347 /* created a core file */
348 #define CLD_TRAPPED 4 /* Traced child has trapped */
349 #define CLD_STOPPED 5 /* Child has stopped */
350 #define CLD_CONTINUED 6 /* Stopped child has continued */
351
352 /* codes for SIGPOLL */
353 #define POLL_IN 1 /* Data input available */
354 #define POLL_OUT 2 /* Output buffers available */
355 #define POLL_MSG 3 /* Input message available */
356 #define POLL_ERR 4 /* I/O Error */
357 #define POLL_PRI 5 /* High priority input available */
358 #define POLL_HUP 6 /* Device disconnected */
359
360 #endif
361
362 #if __POSIX_VISIBLE || __XSI_VISIBLE
363 struct __siginfo;
364
365 /*
366 * Signal vector "template" used in sigaction call.
367 */
368 struct sigaction {
369 union {
370 void (*__sa_handler)(int);
371 void (*__sa_sigaction)(int, struct __siginfo *, void *);
372 } __sigaction_u; /* signal handler */
373 int sa_flags; /* see signal options below */
374 sigset_t sa_mask; /* signal mask to apply */
375 };
376
377 #define sa_handler __sigaction_u.__sa_handler
378 #endif
379
380 #if __XSI_VISIBLE
381 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
382 #define sa_sigaction __sigaction_u.__sa_sigaction
383 #endif
384
385 #if __POSIX_VISIBLE || __XSI_VISIBLE
386 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
387 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
388
389 #if __XSI_VISIBLE
390 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
391 #define SA_RESTART 0x0002 /* restart system call on signal return */
392 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
393 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
394 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
395 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
396 #endif
397
398 #if __BSD_VISIBLE
399 #define NSIG 32 /* number of old signals (counting 0) */
400 #endif
401
402 #if __POSIX_VISIBLE || __XSI_VISIBLE
403 #define SI_NOINFO 0 /* No signal info besides si_signo. */
404 #define SI_USER 0x10001 /* Signal sent by kill(). */
405 #define SI_QUEUE 0x10002 /* Signal sent by the sigqueue(). */
406 #define SI_TIMER 0x10003 /* Signal generated by expiration of */
407 /* a timer set by timer_settime(). */
408 #define SI_ASYNCIO 0x10004 /* Signal generated by completion of */
409 /* an asynchronous I/O request.*/
410 #define SI_MESGQ 0x10005 /* Signal generated by arrival of a */
411 /* message on an empty message queue. */
412 #define SI_KERNEL 0x10006
413 #define SI_LWP 0x10007 /* Signal sent by thr_kill */
414 #endif
415 #if __BSD_VISIBLE
416 #define SI_UNDEFINED 0
417 #endif
418
419 #if __BSD_VISIBLE
420 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
421 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
422 #endif
423
424 #if __XSI_VISIBLE
425 #if __BSD_VISIBLE
426 #define __stack_t sigaltstack
427 #endif
428 typedef struct __stack_t stack_t;
429
430 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
431 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
432 #define MINSIGSTKSZ __MINSIGSTKSZ /* minimum stack size */
433 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
434 #endif
435
436 /*
437 * Structure used in sigaltstack call. Its definition is always
438 * needed for __ucontext. If __BSD_VISIBLE is defined, the structure
439 * tag is actually sigaltstack.
440 */
441 struct __stack_t {
442 void *ss_sp; /* signal stack base */
443 __size_t ss_size; /* signal stack length */
444 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
445 };
446
447 #if __BSD_VISIBLE
448 /*
449 * 4.3 compatibility:
450 * Signal vector "template" used in sigvec call.
451 */
452 struct sigvec {
453 __sighandler_t *sv_handler; /* signal handler */
454 int sv_mask; /* signal mask to apply */
455 int sv_flags; /* see signal options below */
456 };
457
458 #define SV_ONSTACK SA_ONSTACK
459 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
460 #define SV_RESETHAND SA_RESETHAND
461 #define SV_NODEFER SA_NODEFER
462 #define SV_NOCLDSTOP SA_NOCLDSTOP
463 #define SV_SIGINFO SA_SIGINFO
464 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
465 #endif
466
467 /* Keep this in one place only */
468 #if defined(_KERNEL) && defined(COMPAT_43) && \
469 !defined(__i386__)
470 struct osigcontext {
471 int _not_used;
472 };
473 #endif
474
475 #if __XSI_VISIBLE
476 /*
477 * Structure used in sigstack call.
478 */
479 struct sigstack {
480 void *ss_sp; /* signal stack pointer */
481 int ss_onstack; /* current status */
482 };
483 #endif
484
485 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
486 /*
487 * Macro for converting signal number to a mask suitable for
488 * sigblock().
489 */
490 #define sigmask(m) (1 << ((m)-1))
491 #endif
492
493 #if __BSD_VISIBLE
494 #define BADSIG SIG_ERR
495 #endif
496
497 #if __POSIX_VISIBLE || __XSI_VISIBLE
498 /*
499 * Flags for sigprocmask:
500 */
501 #define SIG_BLOCK 1 /* block specified signal set */
502 #define SIG_UNBLOCK 2 /* unblock specified signal set */
503 #define SIG_SETMASK 3 /* set specified signal set */
504 #endif
505
506 /*
507 * For historical reasons; programs expect signal's return value to be
508 * defined by <sys/signal.h>.
509 */
510 __BEGIN_DECLS
511 __sighandler_t *signal(int, __sighandler_t *);
512 __END_DECLS
513
514 #endif /* !_SYS_SIGNAL_H_ */
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