signalvar.h revision 33777 
1/*
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 *	@(#)signalvar.h	8.6 (Berkeley) 2/19/95
34 * $Id: signalvar.h,v 1.16 1997/08/30 11:24:05 peter Exp $
35 */
36
37#ifndef	_SYS_SIGNALVAR_H_		/* tmp for user.h */
38#define	_SYS_SIGNALVAR_H_
39
40/*
41 * Kernel signal definitions and data structures,
42 * not exported to user programs.
43 */
44
45/*
46 * Process signal actions and state, needed only within the process
47 * (not necessarily resident).
48 */
49struct	sigacts {
50	sig_t	ps_sigact[NSIG];	/* disposition of signals */
51	sigset_t ps_catchmask[NSIG];	/* signals to be blocked */
52	sigset_t ps_sigonstack;		/* signals to take on sigstack */
53	sigset_t ps_sigintr;		/* signals that interrupt syscalls */
54	sigset_t ps_sigreset;		/* signals that reset when caught */
55	sigset_t ps_signodefer;		/* signals not masked while handled */
56	sigset_t ps_oldmask;		/* saved mask from before sigpause */
57	int	ps_flags;		/* signal flags, below */
58	struct	sigaltstack ps_sigstk;	/* sp & on stack state variable */
59	int	ps_sig;			/* for core dump/debugger XXX */
60	u_long	ps_code;		/* for core dump/debugger XXX */
61	sigset_t ps_usertramp;		/* SunOS compat; libc sigtramp XXX */
62};
63
64/* signal flags */
65#define	SAS_OLDMASK	0x01		/* need to restore mask before pause */
66#define	SAS_ALTSTACK	0x02		/* have alternate signal stack */
67
68/* additional signal action values, used only temporarily/internally */
69#define	SIG_CATCH	((__sighandler_t *)2)
70#define	SIG_HOLD	((__sighandler_t *)3)
71
72/*
73 * get signal action for process and signal; currently only for current process
74 */
75#define SIGACTION(p, sig)	(p->p_sigacts->ps_sigact[(sig)])
76
77/*
78 * Determine signal that should be delivered to process p, the current
79 * process, 0 if none.  If there is a pending stop signal with default
80 * action, the process stops in issignal().
81 */
82#define	CURSIG(p)							\
83	(((p)->p_siglist == 0 ||					\
84	    (((p)->p_flag & P_TRACED) == 0 &&				\
85	     ((p)->p_siglist & ~(p)->p_sigmask) == 0)) ?		\
86	    0 : issignal(p))
87
88/*
89 * Clear a pending signal from a process.
90 */
91#define	CLRSIG(p, sig)	{ (p)->p_siglist &= ~sigmask(sig); }
92
93/*
94 * Signal properties and actions.
95 * The array below categorizes the signals and their default actions
96 * according to the following properties:
97 */
98#define	SA_KILL		0x01		/* terminates process by default */
99#define	SA_CORE		0x02		/* ditto and coredumps */
100#define	SA_STOP		0x04		/* suspend process */
101#define	SA_TTYSTOP	0x08		/* ditto, from tty */
102#define	SA_IGNORE	0x10		/* ignore by default */
103#define	SA_CONT		0x20		/* continue if suspended */
104#define	SA_CANTMASK	0x40		/* non-maskable, catchable */
105
106#ifdef	SIGPROP
107static int sigprop[NSIG + 1] = {
108	0,			/* unused */
109	SA_KILL,		/* SIGHUP */
110	SA_KILL,		/* SIGINT */
111	SA_KILL|SA_CORE,	/* SIGQUIT */
112	SA_KILL|SA_CORE,	/* SIGILL */
113	SA_KILL|SA_CORE,	/* SIGTRAP */
114	SA_KILL|SA_CORE,	/* SIGABRT */
115	SA_KILL|SA_CORE,	/* SIGEMT */
116	SA_KILL|SA_CORE,	/* SIGFPE */
117	SA_KILL,		/* SIGKILL */
118	SA_KILL|SA_CORE,	/* SIGBUS */
119	SA_KILL|SA_CORE,	/* SIGSEGV */
120	SA_KILL|SA_CORE,	/* SIGSYS */
121	SA_KILL,		/* SIGPIPE */
122	SA_KILL,		/* SIGALRM */
123	SA_KILL,		/* SIGTERM */
124	SA_IGNORE,		/* SIGURG */
125	SA_STOP,		/* SIGSTOP */
126	SA_STOP|SA_TTYSTOP,	/* SIGTSTP */
127	SA_IGNORE|SA_CONT,	/* SIGCONT */
128	SA_IGNORE,		/* SIGCHLD */
129	SA_STOP|SA_TTYSTOP,	/* SIGTTIN */
130	SA_STOP|SA_TTYSTOP,	/* SIGTTOU */
131	SA_IGNORE,		/* SIGIO */
132	SA_KILL,		/* SIGXCPU */
133	SA_KILL,		/* SIGXFSZ */
134	SA_KILL,		/* SIGVTALRM */
135	SA_KILL,		/* SIGPROF */
136	SA_IGNORE,		/* SIGWINCH  */
137	SA_IGNORE,		/* SIGINFO */
138	SA_KILL,		/* SIGUSR1 */
139	SA_KILL,		/* SIGUSR2 */
140};
141
142#define	contsigmask	(sigmask(SIGCONT))
143#define	stopsigmask	(sigmask(SIGSTOP) | sigmask(SIGTSTP) | \
144			    sigmask(SIGTTIN) | sigmask(SIGTTOU))
145
146#endif /* SIGPROP */
147
148#define	sigcantmask	(sigmask(SIGKILL) | sigmask(SIGSTOP))
149
150#ifdef KERNEL
151struct pgrp;
152
153/*
154 * Machine-independent functions:
155 */
156void	execsigs __P((struct proc *p));
157void	gsignal __P((int pgid, int sig));
158int	issignal __P((struct proc *p));
159void	killproc __P((struct proc *p, char *why));
160void	pgsignal __P((struct pgrp *pgrp, int sig, int checkctty));
161void	postsig __P((int sig));
162void	psignal __P((struct proc *p, int sig));
163void	sigexit __P((struct proc *p, int signum));
164void	siginit __P((struct proc *p));
165void	trapsignal __P((struct proc *p, int sig, u_long code));
166
167/*
168 * Machine-dependent functions:
169 */
170void	sendsig __P((sig_t action, int sig, int returnmask, u_long code));
171#endif	/* KERNEL */
172#endif	/* !_SYS_SIGNALVAR_H_ */
173