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[dragonfly.git] / sys / sys / signalvar.h
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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 * $FreeBSD: src/sys/sys/signalvar.h,v 1.34.2.1 2000/05/16 06:58:05 dillon Exp $
35 */
36
37#ifndef _SYS_SIGNALVAR_H_ /* tmp for user.h */
38#define _SYS_SIGNALVAR_H_
39
40#include <sys/signal.h>
41#include <sys/proc.h>
42#include <machine/smp.h>
43
44/*
45 * Kernel signal definitions and data structures,
46 * not exported to user programs.
47 */
48
49/*
50 * Process signal actions and state, needed only within the process
51 * (not necessarily resident).
52 */
53struct sigacts {
54 sig_t ps_sigact[_SIG_MAXSIG]; /* disposition of signals */
55 sigset_t ps_catchmask[_SIG_MAXSIG]; /* signals to be blocked */
56 sigset_t ps_sigonstack; /* signals to take on sigstack */
57 sigset_t ps_sigintr; /* signals that interrupt syscalls */
58 sigset_t ps_sigreset; /* signals that reset when caught */
59 sigset_t ps_signodefer; /* signals not masked while handled */
60 sigset_t ps_siginfo; /* signals that want SA_SIGINFO args */
61 sigset_t ps_osigset; /* signals that use osigset_t */
62 sigset_t ps_usertramp; /* SunOS compat; libc sigtramp XXX */
63};
64
65/*
66 * Compatibility.
67 */
68typedef struct {
69 struct osigcontext si_sc;
70 int si_signo;
71 int si_code;
72 union sigval si_value;
73} osiginfo_t;
74
75struct osigaction {
76 union {
77 void (*__sa_handler) __P((int));
78 void (*__sa_sigaction) __P((int, osiginfo_t *, void *));
79 } __sigaction_u; /* signal handler */
80 osigset_t sa_mask; /* signal mask to apply */
81 int sa_flags; /* see signal options below */
82};
83
84typedef void __osiginfohandler_t __P((int, osiginfo_t *, void *));
85
86/* additional signal action values, used only temporarily/internally */
87#define SIG_CATCH ((__sighandler_t *)2)
88#define SIG_HOLD ((__sighandler_t *)3)
89
90/*
91 * get signal action for process and signal; currently only for current process
92 */
93#define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)])
94
95/*
96 * sigset_t manipulation macros
97 */
98#define SIGADDSET(set, signo) \
99 (set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo)
100
101#define SIGDELSET(set, signo) \
102 (set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo)
103
104#define SIGEMPTYSET(set) \
105 do { \
106 int __i; \
107 for (__i = 0; __i < _SIG_WORDS; __i++) \
108 (set).__bits[__i] = 0; \
109 } while (0)
110
111#define SIGFILLSET(set) \
112 do { \
113 int __i; \
114 for (__i = 0; __i < _SIG_WORDS; __i++) \
115 (set).__bits[__i] = ~(unsigned int)0; \
116 } while (0)
117
118#define SIGISMEMBER(set, signo) \
119 ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo))
120
121#define SIGISEMPTY(set) __sigisempty(&(set))
122#define SIGNOTEMPTY(set) (!__sigisempty(&(set)))
123
124#define SIGSETEQ(set1, set2) __sigseteq(&(set1), &(set2))
125#define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2)))
126
127#define SIGSETOR(set1, set2) \
128 do { \
129 int __i; \
130 for (__i = 0; __i < _SIG_WORDS; __i++) \
131 (set1).__bits[__i] |= (set2).__bits[__i]; \
132 } while (0)
133
134#define SIGSETAND(set1, set2) \
135 do { \
136 int __i; \
137 for (__i = 0; __i < _SIG_WORDS; __i++) \
138 (set1).__bits[__i] &= (set2).__bits[__i]; \
139 } while (0)
140
141#define SIGSETNAND(set1, set2) \
142 do { \
143 int __i; \
144 for (__i = 0; __i < _SIG_WORDS; __i++) \
145 (set1).__bits[__i] &= ~(set2).__bits[__i]; \
146 } while (0)
147
148#define SIGSETLO(set1, set2) ((set1).__bits[0] = (set2).__bits[0])
149#define SIGSETOLD(set, oset) ((set).__bits[0] = (oset))
150
151#define SIG_CANTMASK(set) \
152 SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP)
153
154#define SIG_STOPSIGMASK(set) \
155 SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \
156 SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU)
157
158#define SIG_CONTSIGMASK(set) \
159 SIGDELSET(set, SIGCONT)
160
161#define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP))
162
163#define SIG2OSIG(sig, osig) osig = (sig).__bits[0]
164#define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig
165
166static __inline int
167__sigisempty(sigset_t *set)
168{
169 int i;
170
171 for (i = 0; i < _SIG_WORDS; i++) {
172 if (set->__bits[i])
173 return (0);
174 }
175 return (1);
176}
177
178static __inline int
179__sigseteq(sigset_t *set1, sigset_t *set2)
180{
181 int i;
182
183 for (i = 0; i < _SIG_WORDS; i++) {
184 if (set1->__bits[i] != set2->__bits[i])
185 return (0);
186 }
187 return (1);
188}
189
190#ifdef _KERNEL
191
192struct pgrp;
193struct proc;
194struct sigio;
195
196extern int sugid_coredump; /* Sysctl variable kern.sugid_coredump */
197
198/*
199 * Machine-independent functions:
200 */
201void check_sigacts __P((void));
202void execsigs __P((struct proc *p));
203void gsignal __P((int pgid, int sig));
204int issignal __P((struct proc *p));
205void killproc __P((struct proc *p, char *why));
206void pgsigio __P((struct sigio *, int signum, int checkctty));
207void pgsignal __P((struct pgrp *pgrp, int sig, int checkctty));
208void postsig __P((int sig));
209void psignal __P((struct proc *p, int sig));
210void sigexit __P((struct proc *p, int signum));
211void siginit __P((struct proc *p));
212void trapsignal __P((struct proc *p, int sig, u_long code));
213int __cursig __P((struct proc *p));
214
215/*
216 * Machine-dependent functions:
217 */
218void sendsig __P((sig_t action, int sig, sigset_t *retmask, u_long code));
219
220/*
221 * Inline functions:
222 */
223#define CURSIG(p) __cursig(p)
224
225/*
226 * Determine signal that should be delivered to process p, the current
227 * process, 0 if none. If there is a pending stop signal with default
228 * action, the process stops in issignal().
229 *
230 * MP SAFE
231 */
232extern __inline int __cursig(struct proc *p)
233{
234 sigset_t tmpset;
235 int r;
236
237 tmpset = p->p_siglist;
238 SIGSETNAND(tmpset, p->p_sigmask);
239 if (SIGISEMPTY(p->p_siglist) ||
240 (!(p->p_flag & P_TRACED) && SIGISEMPTY(tmpset))) {
241 return(0);
242 }
243 get_mplock();
244 r = issignal(p);
245 rel_mplock();
246 return(r);
247}
248
249#endif /* _KERNEL */
250
251#endif /* !_SYS_SIGNALVAR_H_ */