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 /*
49 * System defined signals.
50 */
51 #if __POSIX_VISIBLE || __XSI_VISIBLE
52 #define SIGHUP 1 /* hangup */
53 #endif
54 #define SIGINT 2 /* interrupt */
55 #if __POSIX_VISIBLE || __XSI_VISIBLE
56 #define SIGQUIT 3 /* quit */
57 #endif
58 #define SIGILL 4 /* illegal instr. (not reset when caught) */
59 #if __XSI_VISIBLE
60 #define SIGTRAP 5 /* trace trap (not reset when caught) */
61 #endif
62 #define SIGABRT 6 /* abort() */
63 #if __BSD_VISIBLE
64 #define SIGIOT SIGABRT /* compatibility */
65 #define SIGEMT 7 /* EMT instruction */
66 #endif
67 #define SIGFPE 8 /* floating point exception */
68 #if __POSIX_VISIBLE || __XSI_VISIBLE
69 #define SIGKILL 9 /* kill (cannot be caught or ignored) */
70 #endif
71 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
72 #define SIGBUS 10 /* bus error */
73 #endif
74 #define SIGSEGV 11 /* segmentation violation */
75 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
76 #define SIGSYS 12 /* non-existent system call invoked */
77 #endif
78 #if __POSIX_VISIBLE || __XSI_VISIBLE
79 #define SIGPIPE 13 /* write on a pipe with no one to read it */
80 #define SIGALRM 14 /* alarm clock */
81 #endif
82 #define SIGTERM 15 /* software termination signal from kill */
83 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
84 #define SIGURG 16 /* urgent condition on IO channel */
85 #endif
86 #if __POSIX_VISIBLE || __XSI_VISIBLE
87 #define SIGSTOP 17 /* sendable stop signal not from tty */
88 #define SIGTSTP 18 /* stop signal from tty */
89 #define SIGCONT 19 /* continue a stopped process */
90 #define SIGCHLD 20 /* to parent on child stop or exit */
91 #define SIGTTIN 21 /* to readers pgrp upon background tty read */
92 #define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */
93 #endif
94 #if __BSD_VISIBLE
95 #define SIGIO 23 /* input/output possible signal */
96 #endif
97 #if __XSI_VISIBLE
98 #define SIGXCPU 24 /* exceeded CPU time limit */
99 #define SIGXFSZ 25 /* exceeded file size limit */
100 #define SIGVTALRM 26 /* virtual time alarm */
101 #define SIGPROF 27 /* profiling time alarm */
102 #endif
103 #if __BSD_VISIBLE
104 #define SIGWINCH 28 /* window size changes */
105 #define SIGINFO 29 /* information request */
106 #endif
107 #if __POSIX_VISIBLE || __XSI_VISIBLE
108 #define SIGUSR1 30 /* user defined signal 1 */
109 #define SIGUSR2 31 /* user defined signal 2 */
110 #endif
111 #if __BSD_VISIBLE
112 #define SIGTHR 32 /* reserved by thread library. */
113 #define SIGLWP SIGTHR
114 #define SIGLIBRT 33 /* reserved by real-time library. */
115 #endif
116
117 #define SIGRTMIN 65
118 #define SIGRTMAX 126
119
120 #define SIG_DFL ((__sighandler_t *)0)
121 #define SIG_IGN ((__sighandler_t *)1)
122 #define SIG_ERR ((__sighandler_t *)-1)
123 /* #define SIG_CATCH ((__sighandler_t *)2) See signalvar.h */
124 #define SIG_HOLD ((__sighandler_t *)3)
125
126 /*
127 * Type of a signal handling function.
128 *
129 * Language spec sez signal handlers take exactly one arg, even though we
130 * actually supply three. Ugh!
131 *
132 * We don't try to hide the difference by leaving out the args because
133 * that would cause warnings about conformant programs. Nonconformant
134 * programs can avoid the warnings by casting to (__sighandler_t *) or
135 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
136 *
137 * The kernel should reverse the cast before calling the function. It
138 * has no way to do this, but on most machines 1-arg and 3-arg functions
139 * have the same calling protocol so there is no problem in practice.
140 * A bit in sa_flags could be used to specify the number of args.
141 */
142 typedef void __sighandler_t(int);
143
144 #if __POSIX_VISIBLE || __XSI_VISIBLE
145 #ifndef _SIGSET_T_DECLARED
146 #define _SIGSET_T_DECLARED
147 typedef __sigset_t sigset_t;
148 #endif
149 #endif
150
151 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
152 union sigval {
153 /* Members as suggested by Annex C of POSIX 1003.1b. */
154 int sival_int;
155 void *sival_ptr;
156 /* 6.0 compatibility */
157 int sigval_int;
158 void *sigval_ptr;
159 };
160 #endif
161
162 #if __POSIX_VISIBLE >= 199309
163 struct sigevent {
164 int sigev_notify; /* Notification type */
165 int sigev_signo; /* Signal number */
166 union sigval sigev_value; /* Signal value */
167 union {
168 __lwpid_t _threadid;
169 struct {
170 void (*_function)(union sigval);
171 void *_attribute; /* pthread_attr_t * */
172 } _sigev_thread;
173 unsigned short _kevent_flags;
174 long __spare__[8];
175 } _sigev_un;
176 };
177
178 #if __BSD_VISIBLE
179 #define sigev_notify_kqueue sigev_signo
180 #define sigev_notify_kevent_flags _sigev_un._kevent_flags
181 #define sigev_notify_thread_id _sigev_un._threadid
182 #endif
183 #define sigev_notify_function _sigev_un._sigev_thread._function
184 #define sigev_notify_attributes _sigev_un._sigev_thread._attribute
185
186 #define SIGEV_NONE 0 /* No async notification. */
187 #define SIGEV_SIGNAL 1 /* Generate a queued signal. */
188 #define SIGEV_THREAD 2 /* Call back from another pthread. */
189 #if __BSD_VISIBLE
190 #define SIGEV_KEVENT 3 /* Generate a kevent. */
191 #define SIGEV_THREAD_ID 4 /* Send signal to a kernel thread. */
192 #endif
193 #endif /* __POSIX_VISIBLE >= 199309 */
194
195 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
196 typedef struct __siginfo {
197 int si_signo; /* signal number */
198 int si_errno; /* errno association */
199 /*
200 * Cause of signal, one of the SI_ macros or signal-specific
201 * values, i.e. one of the FPE_... values for SIGFPE. This
202 * value is equivalent to the second argument to an old-style
203 * FreeBSD signal handler.
204 */
205 int si_code; /* signal code */
206 __pid_t si_pid; /* sending process */
207 __uid_t si_uid; /* sender's ruid */
208 int si_status; /* exit value */
209 void *si_addr; /* faulting instruction */
210 union sigval si_value; /* signal value */
211 union {
212 struct {
213 int _trapno;/* machine specific trap code */
214 } _fault;
215 struct {
216 int _timerid;
217 int _overrun;
218 } _timer;
219 struct {
220 int _mqd;
221 } _mesgq;
222 struct {
223 long _band; /* band event for SIGPOLL */
224 } _poll; /* was this ever used ? */
225 struct {
226 long __spare1__;
227 int __spare2__[7];
228 } __spare__;
229 } _reason;
230 } siginfo_t;
231
232 #define si_trapno _reason._fault._trapno
233 #define si_timerid _reason._timer._timerid
234 #define si_overrun _reason._timer._overrun
235 #define si_mqd _reason._mesgq._mqd
236 #define si_band _reason._poll._band
237
238 /** si_code **/
239 /* codes for SIGILL */
240 #define ILL_ILLOPC 1 /* Illegal opcode. */
241 #define ILL_ILLOPN 2 /* Illegal operand. */
242 #define ILL_ILLADR 3 /* Illegal addressing mode. */
243 #define ILL_ILLTRP 4 /* Illegal trap. */
244 #define ILL_PRVOPC 5 /* Privileged opcode. */
245 #define ILL_PRVREG 6 /* Privileged register. */
246 #define ILL_COPROC 7 /* Coprocessor error. */
247 #define ILL_BADSTK 8 /* Internal stack error. */
248
249 /* codes for SIGBUS */
250 #define BUS_ADRALN 1 /* Invalid address alignment. */
251 #define BUS_ADRERR 2 /* Nonexistent physical address. */
252 #define BUS_OBJERR 3 /* Object-specific hardware error. */
253
254 /* codes for SIGSEGV */
255 #define SEGV_MAPERR 1 /* Address not mapped to object. */
256 #define SEGV_ACCERR 2 /* Invalid permissions for mapped */
257 /* object. */
258
259 /* codes for SIGFPE */
260 #define FPE_INTOVF 1 /* Integer overflow. */
261 #define FPE_INTDIV 2 /* Integer divide by zero. */
262 #define FPE_FLTDIV 3 /* Floating point divide by zero. */
263 #define FPE_FLTOVF 4 /* Floating point overflow. */
264 #define FPE_FLTUND 5 /* Floating point underflow. */
265 #define FPE_FLTRES 6 /* Floating point inexact result. */
266 #define FPE_FLTINV 7 /* Invalid floating point operation. */
267 #define FPE_FLTSUB 8 /* Subscript out of range. */
268
269 /* codes for SIGTRAP */
270 #define TRAP_BRKPT 1 /* Process breakpoint. */
271 #define TRAP_TRACE 2 /* Process trace trap. */
272 #define TRAP_DTRACE 3 /* DTrace induced trap. */
273
274 /* codes for SIGCHLD */
275 #define CLD_EXITED 1 /* Child has exited */
276 #define CLD_KILLED 2 /* Child has terminated abnormally but */
277 /* did not create a core file */
278 #define CLD_DUMPED 3 /* Child has terminated abnormally and */
279 /* created a core file */
280 #define CLD_TRAPPED 4 /* Traced child has trapped */
281 #define CLD_STOPPED 5 /* Child has stopped */
282 #define CLD_CONTINUED 6 /* Stopped child has continued */
283
284 /* codes for SIGPOLL */
285 #define POLL_IN 1 /* Data input available */
286 #define POLL_OUT 2 /* Output buffers available */
287 #define POLL_MSG 3 /* Input message available */
288 #define POLL_ERR 4 /* I/O Error */
289 #define POLL_PRI 5 /* High priority input available */
290 #define POLL_HUP 6 /* Device disconnected */
291
292 #endif
293
294 #if __POSIX_VISIBLE || __XSI_VISIBLE
295 struct __siginfo;
296
297 /*
298 * Signal vector "template" used in sigaction call.
299 */
300 struct sigaction {
301 union {
302 void (*__sa_handler)(int);
303 void (*__sa_sigaction)(int, struct __siginfo *, void *);
304 } __sigaction_u; /* signal handler */
305 int sa_flags; /* see signal options below */
306 sigset_t sa_mask; /* signal mask to apply */
307 };
308
309 #define sa_handler __sigaction_u.__sa_handler
310 #endif
311
312 #if __XSI_VISIBLE
313 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
314 #define sa_sigaction __sigaction_u.__sa_sigaction
315 #endif
316
317 #if __POSIX_VISIBLE || __XSI_VISIBLE
318 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
319 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
320
321 #if __XSI_VISIBLE
322 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
323 #define SA_RESTART 0x0002 /* restart system call on signal return */
324 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
325 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
326 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
327 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
328 #endif
329
330 #if __BSD_VISIBLE
331 #define NSIG 32 /* number of old signals (counting 0) */
332 #endif
333
334 #if __POSIX_VISIBLE || __XSI_VISIBLE
335 #define SI_NOINFO 0 /* No signal info besides si_signo. */
336 #define SI_USER 0x10001 /* Signal sent by kill(). */
337 #define SI_QUEUE 0x10002 /* Signal sent by the sigqueue(). */
338 #define SI_TIMER 0x10003 /* Signal generated by expiration of */
339 /* a timer set by timer_settime(). */
340 #define SI_ASYNCIO 0x10004 /* Signal generated by completion of */
341 /* an asynchronous I/O request.*/
342 #define SI_MESGQ 0x10005 /* Signal generated by arrival of a */
343 /* message on an empty message queue. */
344 #define SI_KERNEL 0x10006
345 #define SI_LWP 0x10007 /* Signal sent by thr_kill */
346 #endif
347 #if __BSD_VISIBLE
348 #define SI_UNDEFINED 0
349 #endif
350
351 #if __BSD_VISIBLE
352 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
353 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
354 #endif
355
356 #if __XSI_VISIBLE
357 /*
358 * Structure used in sigaltstack call.
359 */
360 #if __BSD_VISIBLE
361 typedef struct sigaltstack {
362 #else
363 typedef struct {
364 #endif
365 char *ss_sp; /* signal stack base */
366 __size_t ss_size; /* signal stack length */
367 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
368 } stack_t;
369
370 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
371 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
372 #define MINSIGSTKSZ __MINSIGSTKSZ /* minimum stack size */
373 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
374 #endif
375
376 #if __BSD_VISIBLE
377 /*
378 * 4.3 compatibility:
379 * Signal vector "template" used in sigvec call.
380 */
381 struct sigvec {
382 __sighandler_t *sv_handler; /* signal handler */
383 int sv_mask; /* signal mask to apply */
384 int sv_flags; /* see signal options below */
385 };
386
387 #define SV_ONSTACK SA_ONSTACK
388 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
389 #define SV_RESETHAND SA_RESETHAND
390 #define SV_NODEFER SA_NODEFER
391 #define SV_NOCLDSTOP SA_NOCLDSTOP
392 #define SV_SIGINFO SA_SIGINFO
393 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
394 #endif
395
396 /* Keep this in one place only */
397 #if defined(_KERNEL) && defined(COMPAT_43) && \
398 !defined(__i386__)
399 struct osigcontext {
400 int _not_used;
401 };
402 #endif
403
404 #if __XSI_VISIBLE
405 /*
406 * Structure used in sigstack call.
407 */
408 struct sigstack {
409 /* XXX ss_sp's type should be `void *'. */
410 char *ss_sp; /* signal stack pointer */
411 int ss_onstack; /* current status */
412 };
413 #endif
414
415 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
416 /*
417 * Macro for converting signal number to a mask suitable for
418 * sigblock().
419 */
420 #define sigmask(m) (1 << ((m)-1))
421 #endif
422
423 #if __BSD_VISIBLE
424 #define BADSIG SIG_ERR
425 #endif
426
427 #if __POSIX_VISIBLE || __XSI_VISIBLE
428 /*
429 * Flags for sigprocmask:
430 */
431 #define SIG_BLOCK 1 /* block specified signal set */
432 #define SIG_UNBLOCK 2 /* unblock specified signal set */
433 #define SIG_SETMASK 3 /* set specified signal set */
434 #endif
435
436 /*
437 * For historical reasons; programs expect signal's return value to be
438 * defined by <sys/signal.h>.
439 */
440 __BEGIN_DECLS
441 __sighandler_t *signal(int, __sighandler_t *);
442 __END_DECLS
443
444 #endif /* !_SYS_SIGNAL_H_ */
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