xref: /illumos-gate/usr/src/boot/sys/sys/signal.h (revision 199767f8)
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&LTOSTOP) */
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 	void	*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 	void	*ss_sp;			/* signal stack pointer */
410 	int	ss_onstack;		/* current status */
411 };
412 #endif
413 
414 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
415 /*
416  * Macro for converting signal number to a mask suitable for
417  * sigblock().
418  */
419 #define	sigmask(m)	(1 << ((m)-1))
420 #endif
421 
422 #if __BSD_VISIBLE
423 #define	BADSIG		SIG_ERR
424 #endif
425 
426 #if __POSIX_VISIBLE || __XSI_VISIBLE
427 /*
428  * Flags for sigprocmask:
429  */
430 #define	SIG_BLOCK	1	/* block specified signal set */
431 #define	SIG_UNBLOCK	2	/* unblock specified signal set */
432 #define	SIG_SETMASK	3	/* set specified signal set */
433 #endif
434 
435 /*
436  * For historical reasons; programs expect signal's return value to be
437  * defined by <sys/signal.h>.
438  */
439 __BEGIN_DECLS
440 __sighandler_t *signal(int, __sighandler_t *);
441 __END_DECLS
442 
443 #endif /* !_SYS_SIGNAL_H_ */
444