FreeBSD/Linux Kernel Cross Reference
sys/sys/signalvar.h
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: releng/5.2/sys/sys/signalvar.h 122386 2003-11-10 03:11:08Z davidxu $
35 */
36
37 #ifndef _SYS_SIGNALVAR_H_
38 #define _SYS_SIGNALVAR_H_
39
40 #include <sys/queue.h>
41 #include <sys/_lock.h>
42 #include <sys/_mutex.h>
43 #include <sys/signal.h>
44
45 /*
46 * Kernel signal definitions and data structures,
47 * not exported to user programs.
48 */
49
50 /*
51 * Logical process signal actions and state, needed only within the process
52 * The mapping between sigacts and proc structures is 1:1 except for rfork()
53 * processes masquerading as threads which use one structure for the whole
54 * group. All members are locked by the included mutex. The reference count
55 * and mutex must be last for the bcopy in sigacts_copy() to work.
56 */
57 struct sigacts {
58 sig_t ps_sigact[_SIG_MAXSIG]; /* Disposition of signals. */
59 sigset_t ps_catchmask[_SIG_MAXSIG]; /* Signals to be blocked. */
60 sigset_t ps_sigonstack; /* Signals to take on sigstack. */
61 sigset_t ps_sigintr; /* Signals that interrupt syscalls. */
62 sigset_t ps_sigreset; /* Signals that reset when caught. */
63 sigset_t ps_signodefer; /* Signals not masked while handled. */
64 sigset_t ps_siginfo; /* Signals that want SA_SIGINFO args. */
65 sigset_t ps_sigignore; /* Signals being ignored. */
66 sigset_t ps_sigcatch; /* Signals being caught by user. */
67 sigset_t ps_freebsd4; /* signals using freebsd4 ucontext. */
68 sigset_t ps_osigset; /* Signals using <= 3.x osigset_t. */
69 sigset_t ps_usertramp; /* SunOS compat; libc sigtramp. XXX */
70 int ps_flag;
71 int ps_refcnt;
72 struct mtx ps_mtx;
73 };
74
75 #define PS_NOCLDWAIT 0x0001 /* No zombies if child dies */
76 #define PS_NOCLDSTOP 0x0002 /* No SIGCHLD when children stop. */
77 #define PS_CLDSIGIGN 0x0004 /* The SIGCHLD handler is SIG_IGN. */
78
79 #if defined(_KERNEL) && defined(COMPAT_43)
80 /*
81 * Compatibility.
82 */
83 typedef struct {
84 struct osigcontext si_sc;
85 int si_signo;
86 int si_code;
87 union sigval si_value;
88 } osiginfo_t;
89
90 struct osigaction {
91 union {
92 void (*__sa_handler)(int);
93 void (*__sa_sigaction)(int, osiginfo_t *, void *);
94 } __sigaction_u; /* signal handler */
95 osigset_t sa_mask; /* signal mask to apply */
96 int sa_flags; /* see signal options below */
97 };
98
99 typedef void __osiginfohandler_t(int, osiginfo_t *, void *);
100 #endif /* _KERNEL && COMPAT_43 */
101
102 /* additional signal action values, used only temporarily/internally */
103 #define SIG_CATCH ((__sighandler_t *)2)
104 #define SIG_HOLD ((__sighandler_t *)3)
105
106 /*
107 * get signal action for process and signal; currently only for current process
108 */
109 #define SIGACTION(p, sig) (p->p_sigacts->ps_sigact[_SIG_IDX(sig)])
110
111 /*
112 * sigset_t manipulation macros
113 */
114 #define SIGADDSET(set, signo) \
115 ((set).__bits[_SIG_WORD(signo)] |= _SIG_BIT(signo))
116
117 #define SIGDELSET(set, signo) \
118 ((set).__bits[_SIG_WORD(signo)] &= ~_SIG_BIT(signo))
119
120 #define SIGEMPTYSET(set) \
121 do { \
122 int __i; \
123 for (__i = 0; __i < _SIG_WORDS; __i++) \
124 (set).__bits[__i] = 0; \
125 } while (0)
126
127 #define SIGFILLSET(set) \
128 do { \
129 int __i; \
130 for (__i = 0; __i < _SIG_WORDS; __i++) \
131 (set).__bits[__i] = ~0U; \
132 } while (0)
133
134 #define SIGISMEMBER(set, signo) \
135 ((set).__bits[_SIG_WORD(signo)] & _SIG_BIT(signo))
136
137 #define SIGISEMPTY(set) (__sigisempty(&(set)))
138 #define SIGNOTEMPTY(set) (!__sigisempty(&(set)))
139
140 #define SIGSETEQ(set1, set2) (__sigseteq(&(set1), &(set2)))
141 #define SIGSETNEQ(set1, set2) (!__sigseteq(&(set1), &(set2)))
142
143 #define SIGSETOR(set1, set2) \
144 do { \
145 int __i; \
146 for (__i = 0; __i < _SIG_WORDS; __i++) \
147 (set1).__bits[__i] |= (set2).__bits[__i]; \
148 } while (0)
149
150 #define SIGSETAND(set1, set2) \
151 do { \
152 int __i; \
153 for (__i = 0; __i < _SIG_WORDS; __i++) \
154 (set1).__bits[__i] &= (set2).__bits[__i]; \
155 } while (0)
156
157 #define SIGSETNAND(set1, set2) \
158 do { \
159 int __i; \
160 for (__i = 0; __i < _SIG_WORDS; __i++) \
161 (set1).__bits[__i] &= ~(set2).__bits[__i]; \
162 } while (0)
163
164 #define SIGSETLO(set1, set2) ((set1).__bits[0] = (set2).__bits[0])
165 #define SIGSETOLD(set, oset) ((set).__bits[0] = (oset))
166
167 #define SIG_CANTMASK(set) \
168 SIGDELSET(set, SIGKILL), SIGDELSET(set, SIGSTOP)
169
170 #define SIG_STOPSIGMASK(set) \
171 SIGDELSET(set, SIGSTOP), SIGDELSET(set, SIGTSTP), \
172 SIGDELSET(set, SIGTTIN), SIGDELSET(set, SIGTTOU)
173
174 #define SIG_CONTSIGMASK(set) \
175 SIGDELSET(set, SIGCONT)
176
177 #define sigcantmask (sigmask(SIGKILL) | sigmask(SIGSTOP))
178
179 #define SIG2OSIG(sig, osig) (osig = (sig).__bits[0])
180 #define OSIG2SIG(osig, sig) SIGEMPTYSET(sig); (sig).__bits[0] = osig
181
182 static __inline int
183 __sigisempty(sigset_t *set)
184 {
185 int i;
186
187 for (i = 0; i < _SIG_WORDS; i++) {
188 if (set->__bits[i])
189 return (0);
190 }
191 return (1);
192 }
193
194 static __inline int
195 __sigseteq(sigset_t *set1, sigset_t *set2)
196 {
197 int i;
198
199 for (i = 0; i < _SIG_WORDS; i++) {
200 if (set1->__bits[i] != set2->__bits[i])
201 return (0);
202 }
203 return (1);
204 }
205
206 #ifdef _KERNEL
207
208 /*
209 * Specifies the target of a signal.
210 * P - Doesn't matter which thread it gets delivered to.
211 * TD - Must be delivered to a specific thread.
212 */
213 typedef enum sigtarget_enum { SIGTARGET_P, SIGTARGET_TD } sigtarget_t;
214
215 /* Return nonzero if process p has an unmasked pending signal. */
216 #define SIGPENDING(td) \
217 (!SIGISEMPTY((td)->td_siglist) && \
218 !sigsetmasked(&(td)->td_siglist, &(td)->td_sigmask))
219
220 /*
221 * Return the value of the pseudo-expression ((*set & ~*mask) != 0). This
222 * is an optimized version of SIGISEMPTY() on a temporary variable
223 * containing SIGSETNAND(*set, *mask).
224 */
225 static __inline int
226 sigsetmasked(sigset_t *set, sigset_t *mask)
227 {
228 int i;
229
230 for (i = 0; i < _SIG_WORDS; i++) {
231 if (set->__bits[i] & ~mask->__bits[i])
232 return (0);
233 }
234 return (1);
235 }
236
237 struct pgrp;
238 struct thread;
239 struct proc;
240 struct sigio;
241 struct mtx;
242
243 extern int sugid_coredump; /* Sysctl variable kern.sugid_coredump */
244 extern struct mtx sigio_lock;
245
246 /*
247 * Lock the pointers for a sigio object in the underlying objects of
248 * a file descriptor.
249 */
250 #define SIGIO_LOCK() mtx_lock(&sigio_lock)
251 #define SIGIO_TRYLOCK() mtx_trylock(&sigio_lock)
252 #define SIGIO_UNLOCK() mtx_unlock(&sigio_lock)
253 #define SIGIO_LOCKED() mtx_owned(&sigio_lock)
254 #define SIGIO_ASSERT(type) mtx_assert(&sigio_lock, type)
255
256 /*
257 * Machine-independent functions:
258 */
259 int cursig(struct thread *td);
260 void execsigs(struct proc *p);
261 void gsignal(int pgid, int sig);
262 void killproc(struct proc *p, char *why);
263 void pgsigio(struct sigio **, int signum, int checkctty);
264 void pgsignal(struct pgrp *pgrp, int sig, int checkctty);
265 void postsig(int sig);
266 void psignal(struct proc *p, int sig);
267 struct sigacts *sigacts_alloc(void);
268 void sigacts_copy(struct sigacts *dest, struct sigacts *src);
269 void sigacts_free(struct sigacts *ps);
270 struct sigacts *sigacts_hold(struct sigacts *ps);
271 int sigacts_shared(struct sigacts *ps);
272 void sigexit(struct thread *td, int signum) __dead2;
273 int sig_ffs(sigset_t *set);
274 void siginit(struct proc *p);
275 void signotify(struct thread *td);
276 void tdsignal(struct thread *td, int sig, sigtarget_t target);
277 void trapsignal(struct thread *td, int sig, u_long code);
278 void ptracestop(struct thread *td, int sig);
279
280 /*
281 * Machine-dependent functions:
282 */
283 void sendsig(sig_t action, int sig, sigset_t *retmask, u_long code);
284
285 #endif /* _KERNEL */
286
287 #endif /* !_SYS_SIGNALVAR_H_ */
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