FreeBSD/Linux Kernel Cross Reference
sys/sys/signal.h
1 /*-
2 * Copyright (c) 1982, 1986, 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)signal.h 8.4 (Berkeley) 5/4/95
39 * $FreeBSD: releng/5.2/sys/sys/signal.h 112894 2003-03-31 23:31:50Z jeff $
40 */
41
42 #ifndef _SYS_SIGNAL_H_
43 #define _SYS_SIGNAL_H_
44
45 #include <sys/cdefs.h>
46 #include <sys/_types.h>
47 #include <sys/_sigset.h>
48
49 #include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */
50
51 /*
52 * System defined signals.
53 */
54 #if __POSIX_VISIBLE || __XSI_VISIBLE
55 #define SIGHUP 1 /* hangup */
56 #endif
57 #define SIGINT 2 /* interrupt */
58 #if __POSIX_VISIBLE || __XSI_VISIBLE
59 #define SIGQUIT 3 /* quit */
60 #endif
61 #define SIGILL 4 /* illegal instr. (not reset when caught) */
62 #if __XSI_VISIBLE
63 #define SIGTRAP 5 /* trace trap (not reset when caught) */
64 #endif
65 #define SIGABRT 6 /* abort() */
66 #if __BSD_VISIBLE
67 #define SIGIOT SIGABRT /* compatibility */
68 #define SIGEMT 7 /* EMT instruction */
69 #endif
70 #define SIGFPE 8 /* floating point exception */
71 #if __POSIX_VISIBLE || __XSI_VISIBLE
72 #define SIGKILL 9 /* kill (cannot be caught or ignored) */
73 #endif
74 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
75 #define SIGBUS 10 /* bus error */
76 #endif
77 #define SIGSEGV 11 /* segmentation violation */
78 #if __BSD_VISIBLE
79 #define SIGSYS 12 /* non-existent system call invoked */
80 #endif
81 #if __POSIX_VISIBLE || __XSI_VISIBLE
82 #define SIGPIPE 13 /* write on a pipe with no one to read it */
83 #define SIGALRM 14 /* alarm clock */
84 #endif
85 #define SIGTERM 15 /* software termination signal from kill */
86 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
87 #define SIGURG 16 /* urgent condition on IO channel */
88 #endif
89 #if __POSIX_VISIBLE || __XSI_VISIBLE
90 #define SIGSTOP 17 /* sendable stop signal not from tty */
91 #define SIGTSTP 18 /* stop signal from tty */
92 #define SIGCONT 19 /* continue a stopped process */
93 #define SIGCHLD 20 /* to parent on child stop or exit */
94 #define SIGTTIN 21 /* to readers pgrp upon background tty read */
95 #define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */
96 #endif
97 #if __BSD_VISIBLE
98 #define SIGIO 23 /* input/output possible signal */
99 #endif
100 #if __XSI_VISIBLE
101 #define SIGXCPU 24 /* exceeded CPU time limit */
102 #define SIGXFSZ 25 /* exceeded file size limit */
103 #define SIGVTALRM 26 /* virtual time alarm */
104 #define SIGPROF 27 /* profiling time alarm */
105 #endif
106 #if __BSD_VISIBLE
107 #define SIGWINCH 28 /* window size changes */
108 #define SIGINFO 29 /* information request */
109 #endif
110 #if __POSIX_VISIBLE || __XSI_VISIBLE
111 #define SIGUSR1 30 /* user defined signal 1 */
112 #define SIGUSR2 31 /* user defined signal 2 */
113 #endif
114 #if __BSD_VISIBLE
115 #define SIGTHR 32 /* Thread interrupt. */
116 #endif
117 /*
118 * XXX missing SIGRTMIN, SIGRTMAX.
119 */
120
121 #define SIG_DFL ((__sighandler_t *)0)
122 #define SIG_IGN ((__sighandler_t *)1)
123 #define SIG_ERR ((__sighandler_t *)-1)
124 /*
125 * XXX missing SIG_HOLD.
126 */
127
128 /*-
129 * Type of a signal handling function.
130 *
131 * Language spec sez signal handlers take exactly one arg, even though we
132 * actually supply three. Ugh!
133 *
134 * We don't try to hide the difference by leaving out the args because
135 * that would cause warnings about conformant programs. Nonconformant
136 * programs can avoid the warnings by casting to (__sighandler_t *) or
137 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
138 *
139 * The kernel should reverse the cast before calling the function. It
140 * has no way to do this, but on most machines 1-arg and 3-arg functions
141 * have the same calling protocol so there is no problem in practice.
142 * A bit in sa_flags could be used to specify the number of args.
143 */
144 typedef void __sighandler_t(int);
145
146 #if __POSIX_VISIBLE || __XSI_VISIBLE
147 #ifndef _SIGSET_T_DECLARED
148 #define _SIGSET_T_DECLARED
149 typedef __sigset_t sigset_t;
150 #endif
151 #endif
152
153 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
154 union sigval {
155 /* Members as suggested by Annex C of POSIX 1003.1b. */
156 int sigval_int;
157 void *sigval_ptr;
158 };
159 #endif
160
161 #if __POSIX_VISIBLE >= 199309
162 struct sigevent {
163 int sigev_notify; /* Notification type */
164 union {
165 int __sigev_signo; /* Signal number */
166 int __sigev_notify_kqueue;
167 } __sigev_u;
168 union sigval sigev_value; /* Signal value */
169 /*
170 * XXX missing sigev_notify_function, sigev_notify_attributes.
171 */
172 };
173 #define sigev_signo __sigev_u.__sigev_signo
174 #if __BSD_VISIBLE
175 #define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue
176 #endif
177
178 #define SIGEV_NONE 0 /* No async notification */
179 #define SIGEV_SIGNAL 1 /* Generate a queued signal */
180 #if __BSD_VISIBLE
181 #define SIGEV_KEVENT 3 /* Generate a kevent */
182 #endif
183 /*
184 * XXX missing SIGEV_THREAD.
185 */
186 #endif /* __POSIX_VISIBLE >= 199309 */
187
188 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
189 typedef struct __siginfo {
190 int si_signo; /* signal number */
191 int si_errno; /* errno association */
192 /*
193 * Cause of signal, one of the SI_ macros or signal-specific
194 * values, i.e. one of the FPE_... values for SIGFPE. This
195 * value is equivalent to the second argument to an old-style
196 * FreeBSD signal handler.
197 */
198 int si_code; /* signal code */
199 __pid_t si_pid; /* sending process */
200 __uid_t si_uid; /* sender's ruid */
201 int si_status; /* exit value */
202 void *si_addr; /* faulting instruction */
203 union sigval si_value; /* signal value */
204 long si_band; /* band event for SIGPOLL */
205 int __spare__[7]; /* gimme some slack */
206 } siginfo_t;
207 #endif
208
209 #if __POSIX_VISIBLE || __XSI_VISIBLE
210 struct __siginfo;
211
212 /*
213 * Signal vector "template" used in sigaction call.
214 */
215 struct sigaction {
216 union {
217 void (*__sa_handler)(int);
218 void (*__sa_sigaction)(int, struct __siginfo *, void *);
219 } __sigaction_u; /* signal handler */
220 int sa_flags; /* see signal options below */
221 sigset_t sa_mask; /* signal mask to apply */
222 };
223
224 #define sa_handler __sigaction_u.__sa_handler
225 #endif
226
227 #if __XSI_VISIBLE
228 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
229 #define sa_sigaction __sigaction_u.__sa_sigaction
230 #endif
231
232 #if __POSIX_VISIBLE || __XSI_VISIBLE
233 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
234 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
235
236 #if __XSI_VISIBLE
237 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
238 #define SA_RESTART 0x0002 /* restart system call on signal return */
239 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
240 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
241 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
242 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
243 #endif
244 #if __BSD_VISIBLE
245 /* XXX dubious. */
246 #ifdef COMPAT_SUNOS
247 #define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */
248 #endif
249 #endif
250
251 #if __BSD_VISIBLE
252 #define NSIG 32 /* number of old signals (counting 0) */
253 #endif
254
255 #if __POSIX_VISIBLE || __XSI_VISIBLE
256 #define SI_USER 0x10001
257 #define SI_QUEUE 0x10002
258 #define SI_TIMER 0x10003
259 #define SI_ASYNCIO 0x10004
260 #define SI_MESGQ 0x10005
261 #endif
262 #if __BSD_VISIBLE
263 #define SI_UNDEFINED 0
264 #endif
265
266 #if __BSD_VISIBLE
267 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
268 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
269 #endif
270
271 #if __XSI_VISIBLE
272 /*
273 * Structure used in sigaltstack call.
274 */
275 #if __BSD_VISIBLE
276 typedef struct sigaltstack {
277 #else
278 typedef struct {
279 #endif
280 char *ss_sp; /* signal stack base */
281 __size_t ss_size; /* signal stack length */
282 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
283 } stack_t;
284
285 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
286 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
287 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
288 #endif
289
290 #if __BSD_VISIBLE
291 /*
292 * 4.3 compatibility:
293 * Signal vector "template" used in sigvec call.
294 */
295 struct sigvec {
296 __sighandler_t *sv_handler; /* signal handler */
297 int sv_mask; /* signal mask to apply */
298 int sv_flags; /* see signal options below */
299 };
300
301 #define SV_ONSTACK SA_ONSTACK
302 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
303 #define SV_RESETHAND SA_RESETHAND
304 #define SV_NODEFER SA_NODEFER
305 #define SV_NOCLDSTOP SA_NOCLDSTOP
306 #define SV_SIGINFO SA_SIGINFO
307 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
308 #endif
309
310 /* Keep this in one place only */
311 #if defined(_KERNEL) && defined(COMPAT_43) && \
312 !defined(__i386__) && !defined(__alpha__)
313 struct osigcontext {
314 int _not_used;
315 };
316 #endif
317
318 #if __XSI_VISIBLE
319 /*
320 * Structure used in sigstack call.
321 */
322 struct sigstack {
323 /* XXX ss_sp's type should be `void *'. */
324 char *ss_sp; /* signal stack pointer */
325 int ss_onstack; /* current status */
326 };
327 #endif
328
329 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
330 /*
331 * Macro for converting signal number to a mask suitable for
332 * sigblock().
333 */
334 #define sigmask(m) (1 << ((m)-1))
335 #endif
336
337 #if __BSD_VISIBLE
338 #define BADSIG SIG_ERR
339 #endif
340
341 #if __POSIX_VISIBLE || __XSI_VISIBLE
342 /*
343 * Flags for sigprocmask:
344 */
345 #define SIG_BLOCK 1 /* block specified signal set */
346 #define SIG_UNBLOCK 2 /* unblock specified signal set */
347 #define SIG_SETMASK 3 /* set specified signal set */
348 #endif
349
350 /*
351 * For historical reasons; programs expect signal's return value to be
352 * defined by <sys/signal.h>.
353 */
354 __BEGIN_DECLS
355 __sighandler_t *signal(int, __sighandler_t *);
356 __END_DECLS
357
358 #endif /* !_SYS_SIGNAL_H_ */
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