signal.h revision 90776 
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 90776 2002-02-17 17:40:34Z deischen $
40 */
41
42#ifndef	_SYS_SIGNAL_H_
43#define	_SYS_SIGNAL_H_
44
45#include <sys/cdefs.h>
46#include <sys/_posix.h>
47
48/*
49 * sigset_t macros.
50 */
51#define	_SIG_WORDS	4
52#define	_SIG_MAXSIG	128
53#define	_SIG_IDX(sig)	((sig) - 1)
54#define	_SIG_WORD(sig)	(_SIG_IDX(sig) >> 5)
55#define	_SIG_BIT(sig)	(1 << (_SIG_IDX(sig) & 31))
56#define	_SIG_VALID(sig)	((sig) <= _SIG_MAXSIG && (sig) > 0)
57
58/*
59 * System defined signals.
60 */
61#define	SIGHUP		1	/* hangup */
62#define	SIGINT		2	/* interrupt */
63#define	SIGQUIT		3	/* quit */
64#define	SIGILL		4	/* illegal instr. (not reset when caught) */
65#ifndef _POSIX_SOURCE
66#define	SIGTRAP		5	/* trace trap (not reset when caught) */
67#endif
68#define	SIGABRT		6	/* abort() */
69#ifndef _POSIX_SOURCE
70#define	SIGIOT		SIGABRT	/* compatibility */
71#define	SIGEMT		7	/* EMT instruction */
72#endif
73#define	SIGFPE		8	/* floating point exception */
74#define	SIGKILL		9	/* kill (cannot be caught or ignored) */
75#ifndef _POSIX_SOURCE
76#define	SIGBUS		10	/* bus error */
77#endif
78#define	SIGSEGV		11	/* segmentation violation */
79#ifndef _POSIX_SOURCE
80#define	SIGSYS		12	/* non-existent system call invoked */
81#endif
82#define	SIGPIPE		13	/* write on a pipe with no one to read it */
83#define	SIGALRM		14	/* alarm clock */
84#define	SIGTERM		15	/* software termination signal from kill */
85#ifndef _POSIX_SOURCE
86#define	SIGURG		16	/* urgent condition on IO channel */
87#endif
88#define	SIGSTOP		17	/* sendable stop signal not from tty */
89#define	SIGTSTP		18	/* stop signal from tty */
90#define	SIGCONT		19	/* continue a stopped process */
91#define	SIGCHLD		20	/* to parent on child stop or exit */
92#define	SIGTTIN		21	/* to readers pgrp upon background tty read */
93#define	SIGTTOU		22	/* like TTIN if (tp->t_local&LTOSTOP) */
94#ifndef _POSIX_SOURCE
95#define	SIGIO		23	/* input/output possible signal */
96#define	SIGXCPU		24	/* exceeded CPU time limit */
97#define	SIGXFSZ		25	/* exceeded file size limit */
98#define	SIGVTALRM	26	/* virtual time alarm */
99#define	SIGPROF		27	/* profiling time alarm */
100#define	SIGWINCH	28	/* window size changes */
101#define	SIGINFO		29	/* information request */
102#endif
103#define	SIGUSR1		30	/* user defined signal 1 */
104#define	SIGUSR2		31	/* user defined signal 2 */
105
106/*-
107 * Type of a signal handling function.
108 *
109 * Language spec sez signal handlers take exactly one arg, even though we
110 * actually supply three.  Ugh!
111 *
112 * We don't try to hide the difference by leaving out the args because
113 * that would cause warnings about conformant programs.  Nonconformant
114 * programs can avoid the warnings by casting to (__sighandler_t *) or
115 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
116 *
117 * The kernel should reverse the cast before calling the function.  It
118 * has no way to do this, but on most machines 1-arg and 3-arg functions
119 * have the same calling protocol so there is no problem in practice.
120 * A bit in sa_flags could be used to specify the number of args.
121 */
122typedef void __sighandler_t __P((int));
123
124#define	SIG_DFL		((__sighandler_t *)0)
125#define	SIG_IGN		((__sighandler_t *)1)
126#define	SIG_ERR		((__sighandler_t *)-1)
127
128#if defined(_P1003_1B_VISIBLE) || defined(_KERNEL)
129union sigval {
130	/* Members as suggested by Annex C of POSIX 1003.1b. */
131	int	sigval_int;
132	void	*sigval_ptr;
133};
134
135struct sigevent {
136	int	sigev_notify;		/* Notification type */
137	union {
138		int	__sigev_signo;	/* Signal number */
139		int	__sigev_notify_kqueue;
140	} __sigev_u;
141	union sigval sigev_value;	/* Signal value */
142};
143#define sigev_signo		__sigev_u.__sigev_signo
144#define sigev_notify_kqueue	__sigev_u.__sigev_notify_kqueue
145
146#define	SIGEV_NONE	0		/* No async notification */
147#define	SIGEV_SIGNAL	1		/* Generate a queued signal */
148#define SIGEV_KEVENT	3		/* Generate a kevent */
149
150typedef struct __siginfo {
151	int	si_signo;		/* signal number */
152	int	si_errno;		/* errno association */
153	/*
154	 * Cause of signal, one of the SI_ macros or signal-specific
155	 * values, i.e. one of the FPE_... values for SIGFPE. This
156	 * value is equivalent to the second argument to an old-style
157	 * FreeBSD signal handler.
158	 */
159	int	si_code;		/* signal code */
160	int	si_pid;			/* sending process */
161	unsigned int si_uid;		/* sender's ruid */
162	int	si_status;		/* exit value */
163	void	*si_addr;		/* faulting instruction */
164	union sigval si_value;		/* signal value */
165	long	si_band;		/* band event for SIGPOLL */
166	int	__spare__[7];		/* gimme some slack */
167} siginfo_t;
168#endif /* _P1003_1B_VISIBLE */
169
170typedef struct __sigset {
171	unsigned int	__bits[_SIG_WORDS];
172} sigset_t;
173
174/*
175 * XXX - there are some nasty dependencies on include file order. Now that
176 * sigset_t has been defined we can include the MD header.
177 */
178#include <machine/signal.h>     /* sig_atomic_t; trap codes; sigcontext */
179
180#if !defined(_ANSI_SOURCE)
181
182struct __siginfo;
183
184/*
185 * Signal vector "template" used in sigaction call.
186 */
187struct sigaction {
188	union {
189		void    (*__sa_handler) __P((int));
190		void    (*__sa_sigaction) __P((int, struct __siginfo *,
191					       void *));
192	} __sigaction_u;		/* signal handler */
193	int	sa_flags;		/* see signal options below */
194	sigset_t sa_mask;		/* signal mask to apply */
195};
196
197/* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
198#define	sa_handler	__sigaction_u.__sa_handler
199
200#define SA_NOCLDSTOP	0x0008	/* do not generate SIGCHLD on child stop */
201
202#if !defined(_POSIX_SOURCE)
203
204#define	sa_sigaction	__sigaction_u.__sa_sigaction
205
206#define SA_ONSTACK	0x0001	/* take signal on signal stack */
207#define SA_RESTART	0x0002	/* restart system call on signal return */
208#define	SA_RESETHAND	0x0004	/* reset to SIG_DFL when taking signal */
209#define	SA_NODEFER	0x0010	/* don't mask the signal we're delivering */
210#define	SA_NOCLDWAIT	0x0020	/* don't keep zombies around */
211#define	SA_SIGINFO	0x0040	/* signal handler with SA_SIGINFO args */
212#ifdef COMPAT_SUNOS
213#define	SA_USERTRAMP	0x0100	/* do not bounce off kernel's sigtramp */
214#endif
215
216#define NSIG		32	/* number of old signals (counting 0) */
217
218/* POSIX 1003.1b required values. */
219#define SI_USER		0x10001
220#define SI_QUEUE	0x10002
221#define SI_TIMER	0x10003
222#define SI_ASYNCIO	0x10004
223#define SI_MESGQ	0x10005
224
225/* Additional FreeBSD values. */
226#define SI_UNDEFINED	0
227
228typedef void __siginfohandler_t __P((int, struct __siginfo *, void *));
229
230typedef	__sighandler_t	*sig_t;	/* type of pointer to a signal function */
231
232#ifdef	_BSD_SIZE_T_
233typedef	_BSD_SIZE_T_	size_t;
234#undef	_BSD_SIZE_T_
235#endif
236
237/*
238 * Structure used in sigaltstack call.
239 */
240typedef struct sigaltstack {
241	char	*ss_sp;			/* signal stack base */
242	size_t	ss_size;		/* signal stack length */
243	int	ss_flags;		/* SS_DISABLE and/or SS_ONSTACK */
244} stack_t;
245
246#define	SS_ONSTACK	0x0001	/* take signal on alternate stack */
247#define	SS_DISABLE	0x0004	/* disable taking signals on alternate stack */
248#define	SIGSTKSZ	(MINSIGSTKSZ + 32768)	/* recommended stack size */
249
250/*
251 * Forward declaration for __ucontext so that sigreturn can use it
252 * without having to include <ucontext.h>.
253 */
254struct __ucontext;
255
256/*
257 * 4.3 compatibility:
258 * Signal vector "template" used in sigvec call.
259 */
260struct sigvec {
261	__sighandler_t *sv_handler;	/* signal handler */
262	int	sv_mask;		/* signal mask to apply */
263	int	sv_flags;		/* see signal options below */
264};
265
266#define SV_ONSTACK	SA_ONSTACK
267#define SV_INTERRUPT	SA_RESTART	/* same bit, opposite sense */
268#define SV_RESETHAND	SA_RESETHAND
269#define SV_NODEFER	SA_NODEFER
270#define SV_NOCLDSTOP	SA_NOCLDSTOP
271#define SV_SIGINFO	SA_SIGINFO
272#define sv_onstack sv_flags	/* isn't compatibility wonderful! */
273
274/*
275 * Structure used in sigstack call.
276 */
277struct sigstack {
278	char	*ss_sp;			/* signal stack pointer */
279	int	ss_onstack;		/* current status */
280};
281
282/*
283 * Macro for converting signal number to a mask suitable for
284 * sigblock().
285 */
286#define sigmask(m)	(1 << ((m)-1))
287
288#define	BADSIG		SIG_ERR
289
290#endif /* !_POSIX_SOURCE */
291
292/*
293 * Flags for sigprocmask:
294 */
295#define	SIG_BLOCK	1	/* block specified signal set */
296#define	SIG_UNBLOCK	2	/* unblock specified signal set */
297#define	SIG_SETMASK	3	/* set specified signal set */
298
299#endif /* !_ANSI_SOURCE */
300
301/*
302 * For historical reasons; programs expect signal's return value to be
303 * defined by <sys/signal.h>.
304 */
305__BEGIN_DECLS
306__sighandler_t *signal __P((int, __sighandler_t *));
307__END_DECLS
308
309#endif	/* !_SYS_SIGNAL_H_ */
310