signal.h revision 130344 
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: head/sys/sys/signal.h 130344 2004-06-11 11:16:26Z phk $
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/signal.h>	/* sig_atomic_t; trap codes; sigcontext */
46
47/*
48 * System defined signals.
49 */
50#if __POSIX_VISIBLE || __XSI_VISIBLE
51#define	SIGHUP		1	/* hangup */
52#endif
53#define	SIGINT		2	/* interrupt */
54#if __POSIX_VISIBLE || __XSI_VISIBLE
55#define	SIGQUIT		3	/* quit */
56#endif
57#define	SIGILL		4	/* illegal instr. (not reset when caught) */
58#if __XSI_VISIBLE
59#define	SIGTRAP		5	/* trace trap (not reset when caught) */
60#endif
61#define	SIGABRT		6	/* abort() */
62#if __BSD_VISIBLE
63#define	SIGIOT		SIGABRT	/* compatibility */
64#define	SIGEMT		7	/* EMT instruction */
65#endif
66#define	SIGFPE		8	/* floating point exception */
67#if __POSIX_VISIBLE || __XSI_VISIBLE
68#define	SIGKILL		9	/* kill (cannot be caught or ignored) */
69#endif
70#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
71#define	SIGBUS		10	/* bus error */
72#endif
73#define	SIGSEGV		11	/* segmentation violation */
74#if __BSD_VISIBLE
75#define	SIGSYS		12	/* non-existent system call invoked */
76#endif
77#if __POSIX_VISIBLE || __XSI_VISIBLE
78#define	SIGPIPE		13	/* write on a pipe with no one to read it */
79#define	SIGALRM		14	/* alarm clock */
80#endif
81#define	SIGTERM		15	/* software termination signal from kill */
82#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
83#define	SIGURG		16	/* urgent condition on IO channel */
84#endif
85#if __POSIX_VISIBLE || __XSI_VISIBLE
86#define	SIGSTOP		17	/* sendable stop signal not from tty */
87#define	SIGTSTP		18	/* stop signal from tty */
88#define	SIGCONT		19	/* continue a stopped process */
89#define	SIGCHLD		20	/* to parent on child stop or exit */
90#define	SIGTTIN		21	/* to readers pgrp upon background tty read */
91#define	SIGTTOU		22	/* like TTIN if (tp->t_local&LTOSTOP) */
92#endif
93#if __BSD_VISIBLE
94#define	SIGIO		23	/* input/output possible signal */
95#endif
96#if __XSI_VISIBLE
97#define	SIGXCPU		24	/* exceeded CPU time limit */
98#define	SIGXFSZ		25	/* exceeded file size limit */
99#define	SIGVTALRM	26	/* virtual time alarm */
100#define	SIGPROF		27	/* profiling time alarm */
101#endif
102#if __BSD_VISIBLE
103#define	SIGWINCH	28	/* window size changes */
104#define	SIGINFO		29	/* information request */
105#endif
106#if __POSIX_VISIBLE || __XSI_VISIBLE
107#define	SIGUSR1		30	/* user defined signal 1 */
108#define	SIGUSR2		31	/* user defined signal 2 */
109#endif
110#if __BSD_VISIBLE
111#define	SIGTHR		32	/* Thread interrupt. */
112#endif
113/*
114 * XXX missing SIGRTMIN, SIGRTMAX.
115 */
116
117#define	SIG_DFL		((__sighandler_t *)0)
118#define	SIG_IGN		((__sighandler_t *)1)
119#define	SIG_ERR		((__sighandler_t *)-1)
120/*
121 * XXX missing SIG_HOLD.
122 */
123
124/*-
125 * Type of a signal handling function.
126 *
127 * Language spec sez signal handlers take exactly one arg, even though we
128 * actually supply three.  Ugh!
129 *
130 * We don't try to hide the difference by leaving out the args because
131 * that would cause warnings about conformant programs.  Nonconformant
132 * programs can avoid the warnings by casting to (__sighandler_t *) or
133 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
134 *
135 * The kernel should reverse the cast before calling the function.  It
136 * has no way to do this, but on most machines 1-arg and 3-arg functions
137 * have the same calling protocol so there is no problem in practice.
138 * A bit in sa_flags could be used to specify the number of args.
139 */
140typedef	void __sighandler_t(int);
141
142#if __POSIX_VISIBLE || __XSI_VISIBLE
143#ifndef _SIGSET_T_DECLARED
144#define	_SIGSET_T_DECLARED
145typedef	__sigset_t	sigset_t;
146#endif
147#endif
148
149#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
150union sigval {
151	/* Members as suggested by Annex C of POSIX 1003.1b. */
152	int	sigval_int;
153	void	*sigval_ptr;
154};
155#endif
156
157#if __POSIX_VISIBLE >= 199309
158struct sigevent {
159	int	sigev_notify;		/* Notification type */
160	union {
161		int	__sigev_signo;	/* Signal number */
162		int	__sigev_notify_kqueue;
163	} __sigev_u;
164	union sigval sigev_value;	/* Signal value */
165/*
166 * XXX missing sigev_notify_function, sigev_notify_attributes.
167 */
168};
169#define	sigev_signo		__sigev_u.__sigev_signo
170#if __BSD_VISIBLE
171#define	sigev_notify_kqueue	__sigev_u.__sigev_notify_kqueue
172#endif
173
174#define	SIGEV_NONE	0		/* No async notification */
175#define	SIGEV_SIGNAL	1		/* Generate a queued signal */
176#if __BSD_VISIBLE
177#define	SIGEV_KEVENT	3		/* Generate a kevent */
178#endif
179/*
180 * XXX missing SIGEV_THREAD.
181 */
182#endif /* __POSIX_VISIBLE >= 199309 */
183
184#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
185typedef	struct __siginfo {
186	int	si_signo;		/* signal number */
187	int	si_errno;		/* errno association */
188	/*
189	 * Cause of signal, one of the SI_ macros or signal-specific
190	 * values, i.e. one of the FPE_... values for SIGFPE.  This
191	 * value is equivalent to the second argument to an old-style
192	 * FreeBSD signal handler.
193	 */
194	int	si_code;		/* signal code */
195	__pid_t	si_pid;			/* sending process */
196	__uid_t	si_uid;			/* sender's ruid */
197	int	si_status;		/* exit value */
198	void	*si_addr;		/* faulting instruction */
199	union sigval si_value;		/* signal value */
200	long	si_band;		/* band event for SIGPOLL */
201	int	__spare__[7];		/* gimme some slack */
202} siginfo_t;
203#endif
204
205#if __POSIX_VISIBLE || __XSI_VISIBLE
206struct __siginfo;
207
208/*
209 * Signal vector "template" used in sigaction call.
210 */
211struct sigaction {
212	union {
213		void    (*__sa_handler)(int);
214		void    (*__sa_sigaction)(int, struct __siginfo *, void *);
215	} __sigaction_u;		/* signal handler */
216	int	sa_flags;		/* see signal options below */
217	sigset_t sa_mask;		/* signal mask to apply */
218};
219
220#define	sa_handler	__sigaction_u.__sa_handler
221#endif
222
223#if __XSI_VISIBLE
224/* If SA_SIGINFO is set, sa_sigaction must be used instead of 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#endif
243
244#if __BSD_VISIBLE
245#define	NSIG		32	/* number of old signals (counting 0) */
246#endif
247
248#if __POSIX_VISIBLE || __XSI_VISIBLE
249#define	SI_USER		0x10001
250#define	SI_QUEUE	0x10002
251#define	SI_TIMER	0x10003
252#define	SI_ASYNCIO	0x10004
253#define	SI_MESGQ	0x10005
254#endif
255#if __BSD_VISIBLE
256#define	SI_UNDEFINED	0
257#endif
258
259#if __BSD_VISIBLE
260typedef	__sighandler_t	*sig_t;	/* type of pointer to a signal function */
261typedef	void __siginfohandler_t(int, struct __siginfo *, void *);
262#endif
263
264#if __XSI_VISIBLE
265/*
266 * Structure used in sigaltstack call.
267 */
268#if __BSD_VISIBLE
269typedef	struct sigaltstack {
270#else
271typedef	struct {
272#endif
273	char	*ss_sp;			/* signal stack base */
274	__size_t ss_size;		/* signal stack length */
275	int	ss_flags;		/* SS_DISABLE and/or SS_ONSTACK */
276} stack_t;
277
278#define	SS_ONSTACK	0x0001	/* take signal on alternate stack */
279#define	SS_DISABLE	0x0004	/* disable taking signals on alternate stack */
280#define	SIGSTKSZ	(MINSIGSTKSZ + 32768)	/* recommended stack size */
281#endif
282
283#if __BSD_VISIBLE
284/*
285 * 4.3 compatibility:
286 * Signal vector "template" used in sigvec call.
287 */
288struct sigvec {
289	__sighandler_t *sv_handler;	/* signal handler */
290	int	sv_mask;		/* signal mask to apply */
291	int	sv_flags;		/* see signal options below */
292};
293
294#define	SV_ONSTACK	SA_ONSTACK
295#define	SV_INTERRUPT	SA_RESTART	/* same bit, opposite sense */
296#define	SV_RESETHAND	SA_RESETHAND
297#define	SV_NODEFER	SA_NODEFER
298#define	SV_NOCLDSTOP	SA_NOCLDSTOP
299#define	SV_SIGINFO	SA_SIGINFO
300#define	sv_onstack	sv_flags	/* isn't compatibility wonderful! */
301#endif
302
303/* Keep this in one place only */
304#if defined(_KERNEL) && defined(COMPAT_43) && \
305    !defined(__i386__) && !defined(__alpha__)
306struct osigcontext {
307	int _not_used;
308};
309#endif
310
311#if __XSI_VISIBLE
312/*
313 * Structure used in sigstack call.
314 */
315struct sigstack {
316	/* XXX ss_sp's type should be `void *'. */
317	char	*ss_sp;			/* signal stack pointer */
318	int	ss_onstack;		/* current status */
319};
320#endif
321
322#if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
323/*
324 * Macro for converting signal number to a mask suitable for
325 * sigblock().
326 */
327#define	sigmask(m)	(1 << ((m)-1))
328#endif
329
330#if __BSD_VISIBLE
331#define	BADSIG		SIG_ERR
332#endif
333
334#if __POSIX_VISIBLE || __XSI_VISIBLE
335/*
336 * Flags for sigprocmask:
337 */
338#define	SIG_BLOCK	1	/* block specified signal set */
339#define	SIG_UNBLOCK	2	/* unblock specified signal set */
340#define	SIG_SETMASK	3	/* set specified signal set */
341#endif
342
343/*
344 * For historical reasons; programs expect signal's return value to be
345 * defined by <sys/signal.h>.
346 */
347__BEGIN_DECLS
348__sighandler_t *signal(int, __sighandler_t *);
349__END_DECLS
350
351#endif /* !_SYS_SIGNAL_H_ */
352