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/5.0/sys/sys/signal.h 108514 2002-12-31 19:35:41Z mike $
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 /*
115 * XXX missing SIGRTMIN, SIGRTMAX.
116 */
117
118 #define SIG_DFL ((__sighandler_t *)0)
119 #define SIG_IGN ((__sighandler_t *)1)
120 #define SIG_ERR ((__sighandler_t *)-1)
121 /*
122 * XXX missing SIG_HOLD.
123 */
124
125 /*-
126 * Type of a signal handling function.
127 *
128 * Language spec sez signal handlers take exactly one arg, even though we
129 * actually supply three. Ugh!
130 *
131 * We don't try to hide the difference by leaving out the args because
132 * that would cause warnings about conformant programs. Nonconformant
133 * programs can avoid the warnings by casting to (__sighandler_t *) or
134 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
135 *
136 * The kernel should reverse the cast before calling the function. It
137 * has no way to do this, but on most machines 1-arg and 3-arg functions
138 * have the same calling protocol so there is no problem in practice.
139 * A bit in sa_flags could be used to specify the number of args.
140 */
141 typedef void __sighandler_t(int);
142
143 #if __POSIX_VISIBLE || __XSI_VISIBLE
144 #ifndef _SIGSET_T_DECLARED
145 #define _SIGSET_T_DECLARED
146 typedef __sigset_t sigset_t;
147 #endif
148 #endif
149
150 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
151 union sigval {
152 /* Members as suggested by Annex C of POSIX 1003.1b. */
153 int sigval_int;
154 void *sigval_ptr;
155 };
156 #endif
157
158 #if __POSIX_VISIBLE >= 199309
159 struct sigevent {
160 int sigev_notify; /* Notification type */
161 union {
162 int __sigev_signo; /* Signal number */
163 int __sigev_notify_kqueue;
164 } __sigev_u;
165 union sigval sigev_value; /* Signal value */
166 /*
167 * XXX missing sigev_notify_function, sigev_notify_attributes.
168 */
169 };
170 #define sigev_signo __sigev_u.__sigev_signo
171 #if __BSD_VISIBLE
172 #define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue
173 #endif
174
175 #define SIGEV_NONE 0 /* No async notification */
176 #define SIGEV_SIGNAL 1 /* Generate a queued signal */
177 #if __BSD_VISIBLE
178 #define SIGEV_KEVENT 3 /* Generate a kevent */
179 #endif
180 /*
181 * XXX missing SIGEV_THREAD.
182 */
183 #endif /* __POSIX_VISIBLE >= 199309 */
184
185 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
186 typedef struct __siginfo {
187 int si_signo; /* signal number */
188 int si_errno; /* errno association */
189 /*
190 * Cause of signal, one of the SI_ macros or signal-specific
191 * values, i.e. one of the FPE_... values for SIGFPE. This
192 * value is equivalent to the second argument to an old-style
193 * FreeBSD signal handler.
194 */
195 int si_code; /* signal code */
196 __pid_t si_pid; /* sending process */
197 __uid_t si_uid; /* sender's ruid */
198 int si_status; /* exit value */
199 void *si_addr; /* faulting instruction */
200 union sigval si_value; /* signal value */
201 long si_band; /* band event for SIGPOLL */
202 int __spare__[7]; /* gimme some slack */
203 } siginfo_t;
204 #endif
205
206 #if __POSIX_VISIBLE || __XSI_VISIBLE
207 struct __siginfo;
208
209 /*
210 * Signal vector "template" used in sigaction call.
211 */
212 struct sigaction {
213 union {
214 void (*__sa_handler)(int);
215 void (*__sa_sigaction)(int, struct __siginfo *, void *);
216 } __sigaction_u; /* signal handler */
217 int sa_flags; /* see signal options below */
218 sigset_t sa_mask; /* signal mask to apply */
219 };
220
221 #define sa_handler __sigaction_u.__sa_handler
222 #endif
223
224 #if __XSI_VISIBLE
225 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
226 #define sa_sigaction __sigaction_u.__sa_sigaction
227 #endif
228
229 #if __POSIX_VISIBLE || __XSI_VISIBLE
230 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
231 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
232
233 #if __XSI_VISIBLE
234 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
235 #define SA_RESTART 0x0002 /* restart system call on signal return */
236 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
237 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
238 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
239 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
240 #endif
241 #if __BSD_VISIBLE
242 /* XXX dubious. */
243 #ifdef COMPAT_SUNOS
244 #define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */
245 #endif
246 #endif
247
248 #if __BSD_VISIBLE
249 #define NSIG 32 /* number of old signals (counting 0) */
250 #endif
251
252 #if __POSIX_VISIBLE || __XSI_VISIBLE
253 #define SI_USER 0x10001
254 #define SI_QUEUE 0x10002
255 #define SI_TIMER 0x10003
256 #define SI_ASYNCIO 0x10004
257 #define SI_MESGQ 0x10005
258 #endif
259 #if __BSD_VISIBLE
260 #define SI_UNDEFINED 0
261 #endif
262
263 #if __BSD_VISIBLE
264 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
265 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
266 #endif
267
268 #if __XSI_VISIBLE
269 /*
270 * Structure used in sigaltstack call.
271 */
272 #if __BSD_VISIBLE
273 typedef struct sigaltstack {
274 #else
275 typedef struct {
276 #endif
277 char *ss_sp; /* signal stack base */
278 __size_t ss_size; /* signal stack length */
279 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
280 } stack_t;
281
282 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
283 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
284 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
285 #endif
286
287 #if __BSD_VISIBLE
288 /*
289 * 4.3 compatibility:
290 * Signal vector "template" used in sigvec call.
291 */
292 struct sigvec {
293 __sighandler_t *sv_handler; /* signal handler */
294 int sv_mask; /* signal mask to apply */
295 int sv_flags; /* see signal options below */
296 };
297
298 #define SV_ONSTACK SA_ONSTACK
299 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
300 #define SV_RESETHAND SA_RESETHAND
301 #define SV_NODEFER SA_NODEFER
302 #define SV_NOCLDSTOP SA_NOCLDSTOP
303 #define SV_SIGINFO SA_SIGINFO
304 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
305 #endif
306
307 /* Keep this in one place only */
308 #if defined(_KERNEL) && defined(COMPAT_43) && \
309 !defined(__i386__) && !defined(__alpha__)
310 struct osigcontext {
311 int _not_used;
312 };
313 #endif
314
315 #if __XSI_VISIBLE
316 /*
317 * Structure used in sigstack call.
318 */
319 struct sigstack {
320 /* XXX ss_sp's type should be `void *'. */
321 char *ss_sp; /* signal stack pointer */
322 int ss_onstack; /* current status */
323 };
324 #endif
325
326 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
327 /*
328 * Macro for converting signal number to a mask suitable for
329 * sigblock().
330 */
331 #define sigmask(m) (1 << ((m)-1))
332 #endif
333
334 #if __BSD_VISIBLE
335 #define BADSIG SIG_ERR
336 #endif
337
338 #if __POSIX_VISIBLE || __XSI_VISIBLE
339 /*
340 * Flags for sigprocmask:
341 */
342 #define SIG_BLOCK 1 /* block specified signal set */
343 #define SIG_UNBLOCK 2 /* unblock specified signal set */
344 #define SIG_SETMASK 3 /* set specified signal set */
345 #endif
346
347 /*
348 * For historical reasons; programs expect signal's return value to be
349 * defined by <sys/signal.h>.
350 */
351 __BEGIN_DECLS
352 __sighandler_t *signal(int, __sighandler_t *);
353 __END_DECLS
354
355 #endif /* !_SYS_SIGNAL_H_ */
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