signal.h revision 107376 
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 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 *	@(#)signal.h	8.4 (Berkeley) 5/4/95
39 * $FreeBSD: head/sys/sys/signal.h 107376 2002-11-28 15:32:49Z mike $
40 */
41
42#ifndef _SYS_SIGNAL_H_
43#define	_SYS_SIGNAL_H_
44
45#include <sys/cdefs.h>
46#include <sys/_types.h>
47#include <sys/_sigset.h>
48
49#include <machine/signal.h>	/* sig_atomic_t; trap codes; sigcontext */
50
51/*
52 * System defined signals.
53 */
54#if __POSIX_VISIBLE || __XSI_VISIBLE
55#define	SIGHUP		1	/* hangup */
56#endif
57#define	SIGINT		2	/* interrupt */
58#if __POSIX_VISIBLE || __XSI_VISIBLE
59#define	SIGQUIT		3	/* quit */
60#endif
61#define	SIGILL		4	/* illegal instr. (not reset when caught) */
62#if __XSI_VISIBLE
63#define	SIGTRAP		5	/* trace trap (not reset when caught) */
64#endif
65#define	SIGABRT		6	/* abort() */
66#if __BSD_VISIBLE
67#define	SIGIOT		SIGABRT	/* compatibility */
68#define	SIGEMT		7	/* EMT instruction */
69#endif
70#define	SIGFPE		8	/* floating point exception */
71#if __POSIX_VISIBLE || __XSI_VISIBLE
72#define	SIGKILL		9	/* kill (cannot be caught or ignored) */
73#endif
74#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
75#define	SIGBUS		10	/* bus error */
76#endif
77#define	SIGSEGV		11	/* segmentation violation */
78#if __BSD_VISIBLE
79#define	SIGSYS		12	/* non-existent system call invoked */
80#endif
81#if __POSIX_VISIBLE || __XSI_VISIBLE
82#define	SIGPIPE		13	/* write on a pipe with no one to read it */
83#define	SIGALRM		14	/* alarm clock */
84#endif
85#define	SIGTERM		15	/* software termination signal from kill */
86#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
87#define	SIGURG		16	/* urgent condition on IO channel */
88#endif
89#if __POSIX_VISIBLE || __XSI_VISIBLE
90#define	SIGSTOP		17	/* sendable stop signal not from tty */
91#define	SIGTSTP		18	/* stop signal from tty */
92#define	SIGCONT		19	/* continue a stopped process */
93#define	SIGCHLD		20	/* to parent on child stop or exit */
94#define	SIGTTIN		21	/* to readers pgrp upon background tty read */
95#define	SIGTTOU		22	/* like TTIN if (tp->t_local&LTOSTOP) */
96#endif
97#if __BSD_VISIBLE
98#define	SIGIO		23	/* input/output possible signal */
99#endif
100#if __XSI_VISIBLE
101#define	SIGXCPU		24	/* exceeded CPU time limit */
102#define	SIGXFSZ		25	/* exceeded file size limit */
103#define	SIGVTALRM	26	/* virtual time alarm */
104#define	SIGPROF		27	/* profiling time alarm */
105#endif
106#if __BSD_VISIBLE
107#define	SIGWINCH	28	/* window size changes */
108#define	SIGINFO		29	/* information request */
109#endif
110#if __POSIX_VISIBLE || __XSI_VISIBLE
111#define	SIGUSR1		30	/* user defined signal 1 */
112#define	SIGUSR2		31	/* user defined signal 2 */
113#endif
114/*
115 * XXX missing SIGRTMIN, SIGRTMAX.
116 */
117
118#define	SIG_DFL		((__sighandler_t *)0)
119#define	SIG_IGN		((__sighandler_t *)1)
120#define	SIG_ERR		((__sighandler_t *)-1)
121/*
122 * XXX missing SIG_HOLD.
123 */
124
125/*-
126 * Type of a signal handling function.
127 *
128 * Language spec sez signal handlers take exactly one arg, even though we
129 * actually supply three.  Ugh!
130 *
131 * We don't try to hide the difference by leaving out the args because
132 * that would cause warnings about conformant programs.  Nonconformant
133 * programs can avoid the warnings by casting to (__sighandler_t *) or
134 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
135 *
136 * The kernel should reverse the cast before calling the function.  It
137 * has no way to do this, but on most machines 1-arg and 3-arg functions
138 * have the same calling protocol so there is no problem in practice.
139 * A bit in sa_flags could be used to specify the number of args.
140 */
141typedef	void __sighandler_t(int);
142
143#if __POSIX_VISIBLE || __XSI_VISIBLE
144#ifndef _SIGSET_T_DECLARED
145#define	_SIGSET_T_DECLARED
146typedef	__sigset_t	sigset_t;
147#endif
148#endif
149
150#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
151union sigval {
152	/* Members as suggested by Annex C of POSIX 1003.1b. */
153	int	sigval_int;
154	void	*sigval_ptr;
155};
156#endif
157
158#if __POSIX_VISIBLE >= 199309
159struct sigevent {
160	int	sigev_notify;		/* Notification type */
161	union {
162		int	__sigev_signo;	/* Signal number */
163		int	__sigev_notify_kqueue;
164	} __sigev_u;
165	union sigval sigev_value;	/* Signal value */
166/*
167 * XXX missing sigev_notify_function, sigev_notify_attributes.
168 */
169};
170#define	sigev_signo		__sigev_u.__sigev_signo
171#if __BSD_VISIBLE
172#define	sigev_notify_kqueue	__sigev_u.__sigev_notify_kqueue
173#endif
174
175#define	SIGEV_NONE	0		/* No async notification */
176#define	SIGEV_SIGNAL	1		/* Generate a queued signal */
177#if __BSD_VISIBLE
178#define	SIGEV_KEVENT	3		/* Generate a kevent */
179#endif
180/*
181 * XXX missing SIGEV_THREAD.
182 */
183#endif /* __POSIX_VISIBLE >= 199309 */
184
185#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
186typedef	struct __siginfo {
187	int	si_signo;		/* signal number */
188	int	si_errno;		/* errno association */
189	/*
190	 * Cause of signal, one of the SI_ macros or signal-specific
191	 * values, i.e. one of the FPE_... values for SIGFPE.  This
192	 * value is equivalent to the second argument to an old-style
193	 * FreeBSD signal handler.
194	 */
195	int	si_code;		/* signal code */
196	__pid_t	si_pid;			/* sending process */
197	__uid_t	si_uid;			/* sender's ruid */
198	int	si_status;		/* exit value */
199	void	*si_addr;		/* faulting instruction */
200	union sigval si_value;		/* signal value */
201	long	si_band;		/* band event for SIGPOLL */
202	int	__spare__[7];		/* gimme some slack */
203} siginfo_t;
204#endif
205
206#if __POSIX_VISIBLE || __XSI_VISIBLE
207struct __siginfo;
208
209/*
210 * Signal vector "template" used in sigaction call.
211 */
212struct sigaction {
213	union {
214		void    (*__sa_handler)(int);
215		void    (*__sa_sigaction)(int, struct __siginfo *, void *);
216	} __sigaction_u;		/* signal handler */
217	int	sa_flags;		/* see signal options below */
218	sigset_t sa_mask;		/* signal mask to apply */
219};
220#endif
221
222#if __XSI_VISIBLE
223/* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
224#define	sa_handler	__sigaction_u.__sa_handler
225#define	sa_sigaction	__sigaction_u.__sa_sigaction
226#endif
227
228#if __POSIX_VISIBLE || __XSI_VISIBLE
229#define	SA_NOCLDSTOP	0x0008	/* do not generate SIGCHLD on child stop */
230#endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
231
232#if __XSI_VISIBLE
233#define	SA_ONSTACK	0x0001	/* take signal on signal stack */
234#define	SA_RESTART	0x0002	/* restart system call on signal return */
235#define	SA_RESETHAND	0x0004	/* reset to SIG_DFL when taking signal */
236#define	SA_NODEFER	0x0010	/* don't mask the signal we're delivering */
237#define	SA_NOCLDWAIT	0x0020	/* don't keep zombies around */
238#define	SA_SIGINFO	0x0040	/* signal handler with SA_SIGINFO args */
239#endif
240#if __BSD_VISIBLE
241/* XXX dubious. */
242#ifdef COMPAT_SUNOS
243#define	SA_USERTRAMP	0x0100	/* do not bounce off kernel's sigtramp */
244#endif
245#endif
246
247#if __BSD_VISIBLE
248#define	NSIG		32	/* number of old signals (counting 0) */
249#endif
250
251#if __POSIX_VISIBLE || __XSI_VISIBLE
252#define	SI_USER		0x10001
253#define	SI_QUEUE	0x10002
254#define	SI_TIMER	0x10003
255#define	SI_ASYNCIO	0x10004
256#define	SI_MESGQ	0x10005
257#endif
258#if __BSD_VISIBLE
259#define	SI_UNDEFINED	0
260#endif
261
262#if __BSD_VISIBLE
263typedef	__sighandler_t	*sig_t;	/* type of pointer to a signal function */
264typedef	void __siginfohandler_t(int, struct __siginfo *, void *);
265#endif
266
267#if __XSI_VISIBLE
268/*
269 * Structure used in sigaltstack call.
270 */
271#if __BSD_VISIBLE
272typedef	struct sigaltstack {
273#else
274typedef	struct {
275#endif
276	char	*ss_sp;			/* signal stack base */
277	__size_t ss_size;		/* signal stack length */
278	int	ss_flags;		/* SS_DISABLE and/or SS_ONSTACK */
279} stack_t;
280
281#define	SS_ONSTACK	0x0001	/* take signal on alternate stack */
282#define	SS_DISABLE	0x0004	/* disable taking signals on alternate stack */
283#define	SIGSTKSZ	(MINSIGSTKSZ + 32768)	/* recommended stack size */
284#endif
285
286#if __BSD_VISIBLE
287/*
288 * 4.3 compatibility:
289 * Signal vector "template" used in sigvec call.
290 */
291struct sigvec {
292	__sighandler_t *sv_handler;	/* signal handler */
293	int	sv_mask;		/* signal mask to apply */
294	int	sv_flags;		/* see signal options below */
295};
296
297#define	SV_ONSTACK	SA_ONSTACK
298#define	SV_INTERRUPT	SA_RESTART	/* same bit, opposite sense */
299#define	SV_RESETHAND	SA_RESETHAND
300#define	SV_NODEFER	SA_NODEFER
301#define	SV_NOCLDSTOP	SA_NOCLDSTOP
302#define	SV_SIGINFO	SA_SIGINFO
303#define	sv_onstack	sv_flags	/* isn't compatibility wonderful! */
304#endif
305
306/* Keep this in one place only */
307#if defined(_KERNEL) && defined(COMPAT_43) && \
308    !defined(__i386__) && !defined(__alpha__)
309struct osigcontext {
310	int _not_used;
311};
312#endif
313
314#if __XSI_VISIBLE
315/*
316 * Structure used in sigstack call.
317 */
318struct sigstack {
319	/* XXX ss_sp's type should be `void *'. */
320	char	*ss_sp;			/* signal stack pointer */
321	int	ss_onstack;		/* current status */
322};
323#endif
324
325#if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
326/*
327 * Macro for converting signal number to a mask suitable for
328 * sigblock().
329 */
330#define	sigmask(m)	(1 << ((m)-1))
331#endif
332
333#if __BSD_VISIBLE
334#define	BADSIG		SIG_ERR
335#endif
336
337#if __POSIX_VISIBLE || __XSI_VISIBLE
338/*
339 * Flags for sigprocmask:
340 */
341#define	SIG_BLOCK	1	/* block specified signal set */
342#define	SIG_UNBLOCK	2	/* unblock specified signal set */
343#define	SIG_SETMASK	3	/* set specified signal set */
344#endif
345
346/*
347 * For historical reasons; programs expect signal's return value to be
348 * defined by <sys/signal.h>.
349 */
350__BEGIN_DECLS
351__sighandler_t *signal(int, __sighandler_t *);
352__END_DECLS
353
354#endif /* !_SYS_SIGNAL_H_ */
355