FreeBSD/Linux Kernel Cross Reference
sys/sys/signal.h
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 * $FreeBSD$
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
54 typedef __size_t size_t;
55 #define _SIZE_T_DECLARED
56 #endif
57
58 #ifndef _UID_T_DECLARED
59 typedef __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 */
159 typedef void __sighandler_t(int);
160
161 #if __POSIX_VISIBLE || __XSI_VISIBLE
162 #ifndef _SIGSET_T_DECLARED
163 #define _SIGSET_T_DECLARED
164 typedef __sigset_t sigset_t;
165 #endif
166 #endif
167
168 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
169 union 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__))
179 union 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
191 struct pthread_attr;
192
193 struct 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
227 typedef 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__))
270 struct 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
359 struct __siginfo;
360
361 /*
362 * Signal vector "template" used in sigaction call.
363 */
364 struct 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
416 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
417 typedef 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
424 typedef 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 */
437 struct __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 */
448 struct 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__)
466 struct osigcontext {
467 int _not_used;
468 };
469 #endif
470
471 #if __XSI_VISIBLE
472 /*
473 * Structure used in sigstack call.
474 */
475 struct 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_ */
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