signal.h revision 105109 
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 105109 2002-10-14 14:28:46Z mike $
40 */
41
42#ifndef _SYS_SIGNAL_H_
43#define	_SYS_SIGNAL_H_
44
45#include <sys/cdefs.h>
46#include <sys/_sigset.h>
47
48#include <machine/signal.h>	/* sig_atomic_t; trap codes; sigcontext */
49
50/*
51 * System defined signals.
52 */
53#if __POSIX_VISIBLE || __XSI_VISIBLE
54#define	SIGHUP		1	/* hangup */
55#endif
56#define	SIGINT		2	/* interrupt */
57#if __POSIX_VISIBLE || __XSI_VISIBLE
58#define	SIGQUIT		3	/* quit */
59#endif
60#define	SIGILL		4	/* illegal instr. (not reset when caught) */
61#if __XSI_VISIBLE
62#define	SIGTRAP		5	/* trace trap (not reset when caught) */
63#endif
64#define	SIGABRT		6	/* abort() */
65#if __BSD_VISIBLE
66#define	SIGIOT		SIGABRT	/* compatibility */
67#define	SIGEMT		7	/* EMT instruction */
68#endif
69#define	SIGFPE		8	/* floating point exception */
70#if __POSIX_VISIBLE || __XSI_VISIBLE
71#define	SIGKILL		9	/* kill (cannot be caught or ignored) */
72#endif
73#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
74#define	SIGBUS		10	/* bus error */
75#endif
76#define	SIGSEGV		11	/* segmentation violation */
77#if __BSD_VISIBLE
78#define	SIGSYS		12	/* non-existent system call invoked */
79#endif
80#if __POSIX_VISIBLE || __XSI_VISIBLE
81#define	SIGPIPE		13	/* write on a pipe with no one to read it */
82#define	SIGALRM		14	/* alarm clock */
83#endif
84#define	SIGTERM		15	/* software termination signal from kill */
85#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
86#define	SIGURG		16	/* urgent condition on IO channel */
87#endif
88#if __POSIX_VISIBLE || __XSI_VISIBLE
89#define	SIGSTOP		17	/* sendable stop signal not from tty */
90#define	SIGTSTP		18	/* stop signal from tty */
91#define	SIGCONT		19	/* continue a stopped process */
92#define	SIGCHLD		20	/* to parent on child stop or exit */
93#define	SIGTTIN		21	/* to readers pgrp upon background tty read */
94#define	SIGTTOU		22	/* like TTIN if (tp->t_local&LTOSTOP) */
95#endif
96#if __BSD_VISIBLE
97#define	SIGIO		23	/* input/output possible signal */
98#endif
99#if __XSI_VISIBLE
100#define	SIGXCPU		24	/* exceeded CPU time limit */
101#define	SIGXFSZ		25	/* exceeded file size limit */
102#define	SIGVTALRM	26	/* virtual time alarm */
103#define	SIGPROF		27	/* profiling time alarm */
104#endif
105#if __BSD_VISIBLE
106#define	SIGWINCH	28	/* window size changes */
107#define	SIGINFO		29	/* information request */
108#endif
109#if __POSIX_VISIBLE || __XSI_VISIBLE
110#define	SIGUSR1		30	/* user defined signal 1 */
111#define	SIGUSR2		31	/* user defined signal 2 */
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#endif
220
221#if __XSI_VISIBLE
222/* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
223#define	sa_handler	__sigaction_u.__sa_handler
224#define	sa_sigaction	__sigaction_u.__sa_sigaction
225#endif
226
227#if __POSIX_VISIBLE || __XSI_VISIBLE
228#define	SA_NOCLDSTOP	0x0008	/* do not generate SIGCHLD on child stop */
229#endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
230
231#if __XSI_VISIBLE
232#define	SA_ONSTACK	0x0001	/* take signal on signal stack */
233#define	SA_RESTART	0x0002	/* restart system call on signal return */
234#define	SA_RESETHAND	0x0004	/* reset to SIG_DFL when taking signal */
235#define	SA_NODEFER	0x0010	/* don't mask the signal we're delivering */
236#define	SA_NOCLDWAIT	0x0020	/* don't keep zombies around */
237#define	SA_SIGINFO	0x0040	/* signal handler with SA_SIGINFO args */
238#endif
239#if __BSD_VISIBLE
240/* XXX dubious. */
241#ifdef COMPAT_SUNOS
242#define	SA_USERTRAMP	0x0100	/* do not bounce off kernel's sigtramp */
243#endif
244#endif
245
246#if __BSD_VISIBLE
247#define	NSIG		32	/* number of old signals (counting 0) */
248#endif
249
250#if __POSIX_VISIBLE || __XSI_VISIBLE
251#define	SI_USER		0x10001
252#define	SI_QUEUE	0x10002
253#define	SI_TIMER	0x10003
254#define	SI_ASYNCIO	0x10004
255#define	SI_MESGQ	0x10005
256#endif
257#if __BSD_VISIBLE
258#define	SI_UNDEFINED	0
259#endif
260
261#if __BSD_VISIBLE
262typedef	__sighandler_t	*sig_t;	/* type of pointer to a signal function */
263typedef	void __siginfohandler_t(int, struct __siginfo *, void *);
264#endif
265
266#if __XSI_VISIBLE
267/*
268 * Structure used in sigaltstack call.
269 */
270#if __BSD_VISIBLE
271typedef	struct sigaltstack {
272#else
273typedef	struct {
274#endif
275	char	*ss_sp;			/* signal stack base */
276	__size_t ss_size;		/* signal stack length */
277	int	ss_flags;		/* SS_DISABLE and/or SS_ONSTACK */
278} stack_t;
279
280#define	SS_ONSTACK	0x0001	/* take signal on alternate stack */
281#define	SS_DISABLE	0x0004	/* disable taking signals on alternate stack */
282#define	SIGSTKSZ	(MINSIGSTKSZ + 32768)	/* recommended stack size */
283#endif
284
285#if __BSD_VISIBLE
286/*
287 * 4.3 compatibility:
288 * Signal vector "template" used in sigvec call.
289 */
290struct sigvec {
291	__sighandler_t *sv_handler;	/* signal handler */
292	int	sv_mask;		/* signal mask to apply */
293	int	sv_flags;		/* see signal options below */
294};
295
296#define	SV_ONSTACK	SA_ONSTACK
297#define	SV_INTERRUPT	SA_RESTART	/* same bit, opposite sense */
298#define	SV_RESETHAND	SA_RESETHAND
299#define	SV_NODEFER	SA_NODEFER
300#define	SV_NOCLDSTOP	SA_NOCLDSTOP
301#define	SV_SIGINFO	SA_SIGINFO
302#define	sv_onstack	sv_flags	/* isn't compatibility wonderful! */
303#endif
304
305#if __XSI_VISIBLE
306/*
307 * Structure used in sigstack call.
308 */
309struct sigstack {
310	/* XXX ss_sp's type should be `void *'. */
311	char	*ss_sp;			/* signal stack pointer */
312	int	ss_onstack;		/* current status */
313};
314#endif
315
316#if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
317/*
318 * Macro for converting signal number to a mask suitable for
319 * sigblock().
320 */
321#define	sigmask(m)	(1 << ((m)-1))
322#endif
323
324#if __BSD_VISIBLE
325#define	BADSIG		SIG_ERR
326#endif
327
328#if __POSIX_VISIBLE || __XSI_VISIBLE
329/*
330 * Flags for sigprocmask:
331 */
332#define	SIG_BLOCK	1	/* block specified signal set */
333#define	SIG_UNBLOCK	2	/* unblock specified signal set */
334#define	SIG_SETMASK	3	/* set specified signal set */
335#endif
336
337/*
338 * For historical reasons; programs expect signal's return value to be
339 * defined by <sys/signal.h>.
340 */
341__BEGIN_DECLS
342__sighandler_t *signal(int, __sighandler_t *);
343__END_DECLS
344
345#endif /* !_SYS_SIGNAL_H_ */
346