signal.h revision 98301 
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 98301 2002-06-16 18:35:24Z wollman $
40 */
41
42#ifndef	_SYS_SIGNAL_H_
43#define	_SYS_SIGNAL_H_
44
45#include <sys/cdefs.h>
46#include <sys/_posix.h>
47#include <sys/_sigset.h>
48
49/*
50 * System defined signals.
51 */
52#define	SIGHUP		1	/* hangup */
53#define	SIGINT		2	/* interrupt */
54#define	SIGQUIT		3	/* quit */
55#define	SIGILL		4	/* illegal instr. (not reset when caught) */
56#ifndef _POSIX_SOURCE
57#define	SIGTRAP		5	/* trace trap (not reset when caught) */
58#endif
59#define	SIGABRT		6	/* abort() */
60#ifndef _POSIX_SOURCE
61#define	SIGIOT		SIGABRT	/* compatibility */
62#define	SIGEMT		7	/* EMT instruction */
63#endif
64#define	SIGFPE		8	/* floating point exception */
65#define	SIGKILL		9	/* kill (cannot be caught or ignored) */
66#ifndef _POSIX_SOURCE
67#define	SIGBUS		10	/* bus error */
68#endif
69#define	SIGSEGV		11	/* segmentation violation */
70#ifndef _POSIX_SOURCE
71#define	SIGSYS		12	/* non-existent system call invoked */
72#endif
73#define	SIGPIPE		13	/* write on a pipe with no one to read it */
74#define	SIGALRM		14	/* alarm clock */
75#define	SIGTERM		15	/* software termination signal from kill */
76#ifndef _POSIX_SOURCE
77#define	SIGURG		16	/* urgent condition on IO channel */
78#endif
79#define	SIGSTOP		17	/* sendable stop signal not from tty */
80#define	SIGTSTP		18	/* stop signal from tty */
81#define	SIGCONT		19	/* continue a stopped process */
82#define	SIGCHLD		20	/* to parent on child stop or exit */
83#define	SIGTTIN		21	/* to readers pgrp upon background tty read */
84#define	SIGTTOU		22	/* like TTIN if (tp->t_local&LTOSTOP) */
85#ifndef _POSIX_SOURCE
86#define	SIGIO		23	/* input/output possible signal */
87#define	SIGXCPU		24	/* exceeded CPU time limit */
88#define	SIGXFSZ		25	/* exceeded file size limit */
89#define	SIGVTALRM	26	/* virtual time alarm */
90#define	SIGPROF		27	/* profiling time alarm */
91#define	SIGWINCH	28	/* window size changes */
92#define	SIGINFO		29	/* information request */
93#endif
94#define	SIGUSR1		30	/* user defined signal 1 */
95#define	SIGUSR2		31	/* user defined signal 2 */
96
97/*-
98 * Type of a signal handling function.
99 *
100 * Language spec sez signal handlers take exactly one arg, even though we
101 * actually supply three.  Ugh!
102 *
103 * We don't try to hide the difference by leaving out the args because
104 * that would cause warnings about conformant programs.  Nonconformant
105 * programs can avoid the warnings by casting to (__sighandler_t *) or
106 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
107 *
108 * The kernel should reverse the cast before calling the function.  It
109 * has no way to do this, but on most machines 1-arg and 3-arg functions
110 * have the same calling protocol so there is no problem in practice.
111 * A bit in sa_flags could be used to specify the number of args.
112 */
113typedef void __sighandler_t(int);
114
115#define	SIG_DFL		((__sighandler_t *)0)
116#define	SIG_IGN		((__sighandler_t *)1)
117#define	SIG_ERR		((__sighandler_t *)-1)
118
119#if defined(_P1003_1B_VISIBLE) || defined(_KERNEL)
120union sigval {
121	/* Members as suggested by Annex C of POSIX 1003.1b. */
122	int	sigval_int;
123	void	*sigval_ptr;
124};
125
126struct sigevent {
127	int	sigev_notify;		/* Notification type */
128	union {
129		int	__sigev_signo;	/* Signal number */
130		int	__sigev_notify_kqueue;
131	} __sigev_u;
132	union sigval sigev_value;	/* Signal value */
133};
134#define sigev_signo		__sigev_u.__sigev_signo
135#define sigev_notify_kqueue	__sigev_u.__sigev_notify_kqueue
136
137#define	SIGEV_NONE	0		/* No async notification */
138#define	SIGEV_SIGNAL	1		/* Generate a queued signal */
139#define SIGEV_KEVENT	3		/* Generate a kevent */
140
141typedef struct __siginfo {
142	int	si_signo;		/* signal number */
143	int	si_errno;		/* errno association */
144	/*
145	 * Cause of signal, one of the SI_ macros or signal-specific
146	 * values, i.e. one of the FPE_... values for SIGFPE. This
147	 * value is equivalent to the second argument to an old-style
148	 * FreeBSD signal handler.
149	 */
150	int	si_code;		/* signal code */
151	int	si_pid;			/* sending process */
152	unsigned int si_uid;		/* sender's ruid */
153	int	si_status;		/* exit value */
154	void	*si_addr;		/* faulting instruction */
155	union sigval si_value;		/* signal value */
156	long	si_band;		/* band event for SIGPOLL */
157	int	__spare__[7];		/* gimme some slack */
158} siginfo_t;
159#endif /* _P1003_1B_VISIBLE */
160
161/*
162 * XXX - there are some nasty dependencies on include file order.
163 * <sys/_sigset.h> must be included before <machine/signal.h>.
164 */
165#include <machine/signal.h>     /* sig_atomic_t; trap codes; sigcontext */
166
167#if !defined(_ANSI_SOURCE)
168
169struct __siginfo;
170
171/*
172 * Signal vector "template" used in sigaction call.
173 */
174struct sigaction {
175	union {
176		void    (*__sa_handler)(int);
177		void    (*__sa_sigaction)(int, struct __siginfo *, void *);
178	} __sigaction_u;		/* signal handler */
179	int	sa_flags;		/* see signal options below */
180	sigset_t sa_mask;		/* signal mask to apply */
181};
182
183/* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
184#define	sa_handler	__sigaction_u.__sa_handler
185
186#define SA_NOCLDSTOP	0x0008	/* do not generate SIGCHLD on child stop */
187
188#if !defined(_POSIX_SOURCE)
189
190#define	sa_sigaction	__sigaction_u.__sa_sigaction
191
192#define SA_ONSTACK	0x0001	/* take signal on signal stack */
193#define SA_RESTART	0x0002	/* restart system call on signal return */
194#define	SA_RESETHAND	0x0004	/* reset to SIG_DFL when taking signal */
195#define	SA_NODEFER	0x0010	/* don't mask the signal we're delivering */
196#define	SA_NOCLDWAIT	0x0020	/* don't keep zombies around */
197#define	SA_SIGINFO	0x0040	/* signal handler with SA_SIGINFO args */
198#ifdef COMPAT_SUNOS
199#define	SA_USERTRAMP	0x0100	/* do not bounce off kernel's sigtramp */
200#endif
201
202#define NSIG		32	/* number of old signals (counting 0) */
203
204/* POSIX 1003.1b required values. */
205#define SI_USER		0x10001
206#define SI_QUEUE	0x10002
207#define SI_TIMER	0x10003
208#define SI_ASYNCIO	0x10004
209#define SI_MESGQ	0x10005
210
211/* Additional FreeBSD values. */
212#define SI_UNDEFINED	0
213
214typedef void __siginfohandler_t(int, struct __siginfo *, void *);
215
216typedef	__sighandler_t	*sig_t;	/* type of pointer to a signal function */
217
218#ifdef	_BSD_SIZE_T_
219typedef	_BSD_SIZE_T_	size_t;
220#undef	_BSD_SIZE_T_
221#endif
222
223/*
224 * Structure used in sigaltstack call.
225 */
226typedef struct sigaltstack {
227	char	*ss_sp;			/* signal stack base */
228	size_t	ss_size;		/* signal stack length */
229	int	ss_flags;		/* SS_DISABLE and/or SS_ONSTACK */
230} stack_t;
231
232#define	SS_ONSTACK	0x0001	/* take signal on alternate stack */
233#define	SS_DISABLE	0x0004	/* disable taking signals on alternate stack */
234#define	SIGSTKSZ	(MINSIGSTKSZ + 32768)	/* recommended stack size */
235
236/*
237 * Forward declaration for __ucontext so that sigreturn can use it
238 * without having to include <ucontext.h>.
239 */
240struct __ucontext;
241
242/*
243 * 4.3 compatibility:
244 * Signal vector "template" used in sigvec call.
245 */
246struct sigvec {
247	__sighandler_t *sv_handler;	/* signal handler */
248	int	sv_mask;		/* signal mask to apply */
249	int	sv_flags;		/* see signal options below */
250};
251
252#define SV_ONSTACK	SA_ONSTACK
253#define SV_INTERRUPT	SA_RESTART	/* same bit, opposite sense */
254#define SV_RESETHAND	SA_RESETHAND
255#define SV_NODEFER	SA_NODEFER
256#define SV_NOCLDSTOP	SA_NOCLDSTOP
257#define SV_SIGINFO	SA_SIGINFO
258#define sv_onstack sv_flags	/* isn't compatibility wonderful! */
259
260/*
261 * Structure used in sigstack call.
262 */
263struct sigstack {
264	char	*ss_sp;			/* signal stack pointer */
265	int	ss_onstack;		/* current status */
266};
267
268/*
269 * Macro for converting signal number to a mask suitable for
270 * sigblock().
271 */
272#define sigmask(m)	(1 << ((m)-1))
273
274#define	BADSIG		SIG_ERR
275
276#endif /* !_POSIX_SOURCE */
277
278/*
279 * Flags for sigprocmask:
280 */
281#define	SIG_BLOCK	1	/* block specified signal set */
282#define	SIG_UNBLOCK	2	/* unblock specified signal set */
283#define	SIG_SETMASK	3	/* set specified signal set */
284
285#endif /* !_ANSI_SOURCE */
286
287/*
288 * For historical reasons; programs expect signal's return value to be
289 * defined by <sys/signal.h>.
290 */
291__BEGIN_DECLS
292__sighandler_t *signal(int, __sighandler_t *);
293__END_DECLS
294
295#endif	/* !_SYS_SIGNAL_H_ */
296