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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)signalvar.h 8.6 (Berkeley) 2/19/95
30 * $FreeBSD: src/sys/sys/signalvar.h,v 1.34.2.1 2000/05/16 06:58:05 dillon Exp $
31 */
32
33 #ifndef _SYS_SIGNALVAR_H_ /* tmp for user.h */
34 #define _SYS_SIGNALVAR_H_
35
36 /*
37 * Don't bring in the entire bleeding include set if we aren't the kernel.
38 * Userland is not allowed to bring in sys/proc.h except under special
39 * circumstances (e.g. sys/user.h)
40 */
41 #include <sys/signal.h>
42 #ifdef _KERNEL
43 #include <sys/proc.h>
44 #include <machine/lock.h>
45 #endif
46
47 /*
48 * Kernel signal definitions and data structures,
49 * not exported to user programs.
50 */
51
52 /*
53 * Process signal actions and state, needed only within the process
54 * (not necessarily resident).
55 */
56 struct sigacts {
57 sig_t ps_sigact[_SIG_MAXSIG]; /* disposition of signals */
58 sigset_t ps_catchmask[_SIG_MAXSIG]; /* signals to be blocked */
59 struct {
60 int pid;
61 int uid;
62 } ps_frominfo[_SIG_MAXSIG];
63 sigset_t ps_sigignore; /* Signals being ignored. */
64 sigset_t ps_sigcatch; /* Signals being caught by user. */
65 sigset_t ps_sigonstack; /* signals to take on sigstack */
66 sigset_t ps_sigintr; /* signals that interrupt syscalls */
67 sigset_t ps_sigreset; /* signals that reset when caught */
68 sigset_t ps_signodefer; /* signals not masked while handled */
69 sigset_t ps_siginfo; /* signals that want SA_SIGINFO args */
70 sigset_t ps_usertramp; /* SunOS compat; libc sigtramp XXX */
71 unsigned int ps_refcnt;
72 int ps_flag;
73 };
74
75 /* additional signal action values, used only temporarily/internally */
76 #define SIG_CATCH ((__sighandler_t *)2)
77 #define SIG_HOLD ((__sighandler_t *)3)
78
79 #ifdef _KERNEL
80
81 /*
82 * get signal action for process and signal; currently only for current process
83 */
84 #define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)])
85
86 #endif
87
88 /*
89 * sigset_t manipulation macros
90 */
91 #define SIGADDSET(set, signo) \
92 (set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo)
93
94 #define SIGADDSET_ATOMIC(set, signo) \
95 atomic_set_int(&(set).__bits[_SIG_WORD(signo)], _SIG_BIT(signo))
96
97 #define SIGDELSET(set, signo) \
98 (set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo)
99
100 #define SIGDELSET_ATOMIC(set, signo) \
101 atomic_clear_int(&(set).__bits[_SIG_WORD(signo)], _SIG_BIT(signo))
102
103 #define SIGEMPTYSET(set) \
104 do { \
105 int __i; \
106 for (__i = 0; __i < _SIG_WORDS; __i++) \
107 (set).__bits[__i] = 0; \
108 } while (0)
109
110 #define SIGFILLSET(set) \
111 do { \
112 int __i; \
113 for (__i = 0; __i < _SIG_WORDS; __i++) \
114 (set).__bits[__i] = ~(unsigned int)0; \
115 } while (0)
116
117 #define SIGISMEMBER(set, signo) \
118 ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo))
119
120 #define SIGISEMPTY(set) __sigisempty(&(set))
121 #define SIGNOTEMPTY(set) (!__sigisempty(&(set)))
122
123 #define SIGSETEQ(set1, set2) __sigseteq(&(set1), &(set2))
124 #define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2)))
125
126 #define SIGSETOR(set1, set2) \
127 do { \
128 int __i; \
129 for (__i = 0; __i < _SIG_WORDS; __i++) \
130 (set1).__bits[__i] |= (set2).__bits[__i]; \
131 } while (0)
132
133 #define SIGSETAND(set1, set2) \
134 do { \
135 int __i; \
136 for (__i = 0; __i < _SIG_WORDS; __i++) \
137 (set1).__bits[__i] &= (set2).__bits[__i]; \
138 } while (0)
139
140 #define SIGSETNAND(set1, set2) \
141 do { \
142 int __i; \
143 for (__i = 0; __i < _SIG_WORDS; __i++) \
144 (set1).__bits[__i] &= ~(set2).__bits[__i]; \
145 } while (0)
146
147 #define SIGSETOR_CANTMASK(set) \
148 SIGADDSET(set, SIGKILL), SIGADDSET(set, SIGSTOP)
149
150 #define SIG_CONDBLOCKALLSIGS(set, lp) \
151 __sig_condblockallsigs(&(set), lp)
152
153 #define SIG_CANTMASK(set) \
154 SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP)
155
156 #define SIG_STOPSIGMASK(set) \
157 SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \
158 SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU)
159
160 #define SIG_STOPSIGMASK_ATOMIC(set) \
161 SIGDELSET_ATOMIC(set, SIGSTOP), SIGDELSET_ATOMIC(set, SIGTSTP), \
162 SIGDELSET_ATOMIC(set, SIGTTIN), SIGDELSET_ATOMIC(set, SIGTTOU)
163
164 #define SIG_CONTSIGMASK(set) \
165 SIGDELSET(set, SIGCONT)
166
167 #define SIG_CONTSIGMASK_ATOMIC(set) \
168 SIGDELSET_ATOMIC(set, SIGCONT)
169
170 #define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP))
171
172 static __inline int
__sigisempty(sigset_t * set)173 __sigisempty(sigset_t *set)
174 {
175 int i;
176
177 for (i = 0; i < _SIG_WORDS; i++) {
178 if (set->__bits[i])
179 return (0);
180 }
181 return (1);
182 }
183
184 static __inline int
__sigseteq(sigset_t * set1,sigset_t * set2)185 __sigseteq(sigset_t *set1, sigset_t *set2)
186 {
187 int i;
188
189 for (i = 0; i < _SIG_WORDS; i++) {
190 if (set1->__bits[i] != set2->__bits[i])
191 return (0);
192 }
193 return (1);
194 }
195
196 #ifdef _KERNEL
197
198 typedef void (*proc_func_t)(struct proc *);
199
200 struct pgrp;
201 struct proc;
202 struct sigio;
203
204 extern int sugid_coredump; /* Sysctl variable kern.sugid_coredump */
205 extern sigset_t sigcantmask_mask;
206
207 /*
208 * Machine-independent functions:
209 */
210 void execsigs (struct proc *p);
211 void gsignal (int pgid, int sig);
212 int issignal (struct lwp *lp, int maytrace, int *ptokp);
213 int iscaught (struct lwp *p);
214 void killproc (struct proc *p, char *why);
215 void pgsigio (struct sigio *, int signum, int checkctty);
216 void pgsignal (struct pgrp *pgrp, int sig, int checkctty);
217 void postsig (int sig, int ptok);
218 void ksignal (struct proc *p, int sig);
219 void lwpsignal (struct proc *p, struct lwp *lp, int sig);
220 void siginit (struct proc *p);
221 void trapsignal (struct lwp *p, int sig, u_long code);
222
223 /*
224 * Machine-dependent functions:
225 */
226 void sendsig (sig_t action, int sig, sigset_t *retmask, u_long code);
227 void sigexit (struct lwp *lp, int sig) __dead2;
228 int checkpoint_signal_handler(struct lwp *p);
229
230 #endif /* _KERNEL */
231
232 #endif /* !_SYS_SIGNALVAR_H_ */
233