signalvar.h revision 14331 
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	8.3 (Berkeley) 1/4/94
34 * $Id: signalvar.h,v 1.9 1996/01/31 12:44:31 davidg 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_oldmask;		/* saved mask from before sigpause */
55	int	ps_flags;		/* signal flags, below */
56	struct	sigaltstack ps_sigstk;	/* sp & on stack state variable */
57	int	ps_sig;			/* for core dump/debugger XXX */
58	int	ps_code;		/* for core dump/debugger XXX */
59	int	ps_addr;		/* for core dump/debugger XXX */
60	sigset_t ps_usertramp;		/* SunOS compat; libc sigtramp XXX */
61	sigset_t ps_nodefer;		/* signals not to defer */
62	sigset_t ps_sigreset;		/* signals that reset when caught */
63};
64
65/* signal flags */
66#define	SAS_OLDMASK	0x01		/* need to restore mask before pause */
67#define	SAS_ALTSTACK	0x02		/* have alternate signal stack */
68
69/* additional signal action values, used only temporarily/internally */
70#define	SIG_CATCH	((__sighandler_t *)2)
71#define	SIG_HOLD	((__sighandler_t *)3)
72
73/*
74 * get signal action for process and signal; currently only for current process
75 */
76#define SIGACTION(p, sig)	(p->p_sigacts->ps_sigact[(sig)])
77
78/*
79 * Determine signal that should be delivered to process p, the current
80 * process, 0 if none.  If there is a pending stop signal with default
81 * action, the process stops in issig().
82 */
83#define	CURSIG(p)							\
84	(((p)->p_siglist == 0 ||					\
85	    (((p)->p_flag & P_TRACED) == 0 &&				\
86	    ((p)->p_siglist & ~(p)->p_sigmask) == 0)) ?			\
87	    0 : issignal(p))
88
89/*
90 * Clear a pending signal from a process.
91 */
92#define	CLRSIG(p, sig)	{ (p)->p_siglist &= ~sigmask(sig); }
93
94/*
95 * Signal properties and actions.
96 * The array below categorizes the signals and their default actions
97 * according to the following properties:
98 */
99#define	SA_KILL		0x01		/* terminates process by default */
100#define	SA_CORE		0x02		/* ditto and coredumps */
101#define	SA_STOP		0x04		/* suspend process */
102#define	SA_TTYSTOP	0x08		/* ditto, from tty */
103#define	SA_IGNORE	0x10		/* ignore by default */
104#define	SA_CONT		0x20		/* continue if suspended */
105#define	SA_CANTMASK	0x40		/* non-maskable, catchable */
106
107#ifdef	SIGPROP
108static int sigprop[NSIG + 1] = {
109	0,			/* unused */
110	SA_KILL,		/* SIGHUP */
111	SA_KILL,		/* SIGINT */
112	SA_KILL|SA_CORE,	/* SIGQUIT */
113	SA_KILL|SA_CORE,	/* SIGILL */
114	SA_KILL|SA_CORE,	/* SIGTRAP */
115	SA_KILL|SA_CORE,	/* SIGABRT */
116	SA_KILL|SA_CORE,	/* SIGEMT */
117	SA_KILL|SA_CORE,	/* SIGFPE */
118	SA_KILL,		/* SIGKILL */
119	SA_KILL|SA_CORE,	/* SIGBUS */
120	SA_KILL|SA_CORE,	/* SIGSEGV */
121	SA_KILL|SA_CORE,	/* SIGSYS */
122	SA_KILL,		/* SIGPIPE */
123	SA_KILL,		/* SIGALRM */
124	SA_KILL,		/* SIGTERM */
125	SA_IGNORE,		/* SIGURG */
126	SA_STOP,		/* SIGSTOP */
127	SA_STOP|SA_TTYSTOP,	/* SIGTSTP */
128	SA_IGNORE|SA_CONT,	/* SIGCONT */
129	SA_IGNORE,		/* SIGCHLD */
130	SA_STOP|SA_TTYSTOP,	/* SIGTTIN */
131	SA_STOP|SA_TTYSTOP,	/* SIGTTOU */
132	SA_IGNORE,		/* SIGIO */
133	SA_KILL,		/* SIGXCPU */
134	SA_KILL,		/* SIGXFSZ */
135	SA_KILL,		/* SIGVTALRM */
136	SA_KILL,		/* SIGPROF */
137	SA_IGNORE,		/* SIGWINCH  */
138	SA_IGNORE,		/* SIGINFO */
139	SA_KILL,		/* SIGUSR1 */
140	SA_KILL,		/* SIGUSR2 */
141};
142
143#define	contsigmask	(sigmask(SIGCONT))
144#define	stopsigmask	(sigmask(SIGSTOP) | sigmask(SIGTSTP) | \
145			    sigmask(SIGTTIN) | sigmask(SIGTTOU))
146
147#endif /* SIGPROP */
148
149#define	sigcantmask	(sigmask(SIGKILL) | sigmask(SIGSTOP))
150
151#ifdef KERNEL
152/*
153 * Machine-independent functions:
154 */
155void	execsigs __P((struct proc *p));
156void	gsignal __P((int pgid, int sig));
157int	issig __P((struct proc *p));
158int	issignal __P((struct proc *p));
159void	killproc __P((struct proc *, char *));
160void	pgsignal __P((struct pgrp *pgrp, int sig, int checkctty));
161void	postsig __P((int sig));
162void	psignal __P((struct proc *p, int sig));
163void	setsigvec __P((struct proc *, int, struct sigaction *));
164void	sigexit	__P((struct proc *, int));
165void	siginit __P((struct proc *p));
166void	trapsignal __P((struct proc *p, int sig, unsigned code));
167
168/*
169 * Machine-dependent functions:
170 */
171void	sendsig __P((sig_t action, int sig, int returnmask, unsigned code));
172#endif	/* KERNEL */
173#endif	/* !_SYS_SIGNALVAR_H_ */
174