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 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)signal.h 8.4 (Berkeley) 5/4/95
35 * $FreeBSD: releng/5.4/sys/sys/signal.h 145335 2005-04-20 19:11:07Z cvs2svn $
36 */
37
38 #ifndef _SYS_SIGNAL_H_
39 #define _SYS_SIGNAL_H_
40
41 #include <sys/cdefs.h>
42 #include <sys/_types.h>
43 #include <sys/_sigset.h>
44
45 #include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */
46
47 /*
48 * System defined signals.
49 */
50 #if __POSIX_VISIBLE || __XSI_VISIBLE
51 #define SIGHUP 1 /* hangup */
52 #endif
53 #define SIGINT 2 /* interrupt */
54 #if __POSIX_VISIBLE || __XSI_VISIBLE
55 #define SIGQUIT 3 /* quit */
56 #endif
57 #define SIGILL 4 /* illegal instr. (not reset when caught) */
58 #if __XSI_VISIBLE
59 #define SIGTRAP 5 /* trace trap (not reset when caught) */
60 #endif
61 #define SIGABRT 6 /* abort() */
62 #if __BSD_VISIBLE
63 #define SIGIOT SIGABRT /* compatibility */
64 #define SIGEMT 7 /* EMT instruction */
65 #endif
66 #define SIGFPE 8 /* floating point exception */
67 #if __POSIX_VISIBLE || __XSI_VISIBLE
68 #define SIGKILL 9 /* kill (cannot be caught or ignored) */
69 #endif
70 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
71 #define SIGBUS 10 /* bus error */
72 #endif
73 #define SIGSEGV 11 /* segmentation violation */
74 #if __BSD_VISIBLE
75 #define SIGSYS 12 /* non-existent system call invoked */
76 #endif
77 #if __POSIX_VISIBLE || __XSI_VISIBLE
78 #define SIGPIPE 13 /* write on a pipe with no one to read it */
79 #define SIGALRM 14 /* alarm clock */
80 #endif
81 #define SIGTERM 15 /* software termination signal from kill */
82 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
83 #define SIGURG 16 /* urgent condition on IO channel */
84 #endif
85 #if __POSIX_VISIBLE || __XSI_VISIBLE
86 #define SIGSTOP 17 /* sendable stop signal not from tty */
87 #define SIGTSTP 18 /* stop signal from tty */
88 #define SIGCONT 19 /* continue a stopped process */
89 #define SIGCHLD 20 /* to parent on child stop or exit */
90 #define SIGTTIN 21 /* to readers pgrp upon background tty read */
91 #define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */
92 #endif
93 #if __BSD_VISIBLE
94 #define SIGIO 23 /* input/output possible signal */
95 #endif
96 #if __XSI_VISIBLE
97 #define SIGXCPU 24 /* exceeded CPU time limit */
98 #define SIGXFSZ 25 /* exceeded file size limit */
99 #define SIGVTALRM 26 /* virtual time alarm */
100 #define SIGPROF 27 /* profiling time alarm */
101 #endif
102 #if __BSD_VISIBLE
103 #define SIGWINCH 28 /* window size changes */
104 #define SIGINFO 29 /* information request */
105 #endif
106 #if __POSIX_VISIBLE || __XSI_VISIBLE
107 #define SIGUSR1 30 /* user defined signal 1 */
108 #define SIGUSR2 31 /* user defined signal 2 */
109 #endif
110 #if __BSD_VISIBLE
111 #define SIGTHR 32 /* Thread interrupt. */
112 #endif
113 /*
114 * XXX missing SIGRTMIN, SIGRTMAX.
115 */
116
117 #define SIG_DFL ((__sighandler_t *)0)
118 #define SIG_IGN ((__sighandler_t *)1)
119 #define SIG_ERR ((__sighandler_t *)-1)
120 /*
121 * XXX missing SIG_HOLD.
122 */
123
124 /*-
125 * Type of a signal handling function.
126 *
127 * Language spec sez signal handlers take exactly one arg, even though we
128 * actually supply three. Ugh!
129 *
130 * We don't try to hide the difference by leaving out the args because
131 * that would cause warnings about conformant programs. Nonconformant
132 * programs can avoid the warnings by casting to (__sighandler_t *) or
133 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
134 *
135 * The kernel should reverse the cast before calling the function. It
136 * has no way to do this, but on most machines 1-arg and 3-arg functions
137 * have the same calling protocol so there is no problem in practice.
138 * A bit in sa_flags could be used to specify the number of args.
139 */
140 typedef void __sighandler_t(int);
141
142 #if __POSIX_VISIBLE || __XSI_VISIBLE
143 #ifndef _SIGSET_T_DECLARED
144 #define _SIGSET_T_DECLARED
145 typedef __sigset_t sigset_t;
146 #endif
147 #endif
148
149 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
150 union sigval {
151 /* Members as suggested by Annex C of POSIX 1003.1b. */
152 int sigval_int;
153 void *sigval_ptr;
154 };
155 #endif
156
157 #if __POSIX_VISIBLE >= 199309
158 struct sigevent {
159 int sigev_notify; /* Notification type */
160 union {
161 int __sigev_signo; /* Signal number */
162 int __sigev_notify_kqueue;
163 } __sigev_u;
164 union sigval sigev_value; /* Signal value */
165 /*
166 * XXX missing sigev_notify_function, sigev_notify_attributes.
167 */
168 };
169 #define sigev_signo __sigev_u.__sigev_signo
170 #if __BSD_VISIBLE
171 #define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue
172 #endif
173
174 #define SIGEV_NONE 0 /* No async notification */
175 #define SIGEV_SIGNAL 1 /* Generate a queued signal */
176 #if __BSD_VISIBLE
177 #define SIGEV_KEVENT 3 /* Generate a kevent */
178 #endif
179 /*
180 * XXX missing SIGEV_THREAD.
181 */
182 #endif /* __POSIX_VISIBLE >= 199309 */
183
184 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
185 typedef struct __siginfo {
186 int si_signo; /* signal number */
187 int si_errno; /* errno association */
188 /*
189 * Cause of signal, one of the SI_ macros or signal-specific
190 * values, i.e. one of the FPE_... values for SIGFPE. This
191 * value is equivalent to the second argument to an old-style
192 * FreeBSD signal handler.
193 */
194 int si_code; /* signal code */
195 __pid_t si_pid; /* sending process */
196 __uid_t si_uid; /* sender's ruid */
197 int si_status; /* exit value */
198 void *si_addr; /* faulting instruction */
199 union sigval si_value; /* signal value */
200 long si_band; /* band event for SIGPOLL */
201 int __spare__[7]; /* gimme some slack */
202 } siginfo_t;
203 #endif
204
205 #if __POSIX_VISIBLE || __XSI_VISIBLE
206 struct __siginfo;
207
208 /*
209 * Signal vector "template" used in sigaction call.
210 */
211 struct sigaction {
212 union {
213 void (*__sa_handler)(int);
214 void (*__sa_sigaction)(int, struct __siginfo *, void *);
215 } __sigaction_u; /* signal handler */
216 int sa_flags; /* see signal options below */
217 sigset_t sa_mask; /* signal mask to apply */
218 };
219
220 #define sa_handler __sigaction_u.__sa_handler
221 #endif
222
223 #if __XSI_VISIBLE
224 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
225 #define sa_sigaction __sigaction_u.__sa_sigaction
226 #endif
227
228 #if __POSIX_VISIBLE || __XSI_VISIBLE
229 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
230 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
231
232 #if __XSI_VISIBLE
233 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
234 #define SA_RESTART 0x0002 /* restart system call on signal return */
235 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
236 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
237 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
238 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
239 #endif
240
241 #if __BSD_VISIBLE
242 #define NSIG 32 /* number of old signals (counting 0) */
243 #endif
244
245 #if __POSIX_VISIBLE || __XSI_VISIBLE
246 #define SI_USER 0x10001
247 #define SI_QUEUE 0x10002
248 #define SI_TIMER 0x10003
249 #define SI_ASYNCIO 0x10004
250 #define SI_MESGQ 0x10005
251 #endif
252 #if __BSD_VISIBLE
253 #define SI_UNDEFINED 0
254 #endif
255
256 #if __BSD_VISIBLE
257 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
258 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
259 #endif
260
261 #if __XSI_VISIBLE
262 /*
263 * Structure used in sigaltstack call.
264 */
265 #if __BSD_VISIBLE
266 typedef struct sigaltstack {
267 #else
268 typedef struct {
269 #endif
270 char *ss_sp; /* signal stack base */
271 __size_t ss_size; /* signal stack length */
272 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
273 } stack_t;
274
275 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
276 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
277 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
278 #endif
279
280 #if __BSD_VISIBLE
281 /*
282 * 4.3 compatibility:
283 * Signal vector "template" used in sigvec call.
284 */
285 struct sigvec {
286 __sighandler_t *sv_handler; /* signal handler */
287 int sv_mask; /* signal mask to apply */
288 int sv_flags; /* see signal options below */
289 };
290
291 #define SV_ONSTACK SA_ONSTACK
292 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
293 #define SV_RESETHAND SA_RESETHAND
294 #define SV_NODEFER SA_NODEFER
295 #define SV_NOCLDSTOP SA_NOCLDSTOP
296 #define SV_SIGINFO SA_SIGINFO
297 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
298 #endif
299
300 /* Keep this in one place only */
301 #if defined(_KERNEL) && defined(COMPAT_43) && \
302 !defined(__i386__) && !defined(__alpha__)
303 struct osigcontext {
304 int _not_used;
305 };
306 #endif
307
308 #if __XSI_VISIBLE
309 /*
310 * Structure used in sigstack call.
311 */
312 struct sigstack {
313 /* XXX ss_sp's type should be `void *'. */
314 char *ss_sp; /* signal stack pointer */
315 int ss_onstack; /* current status */
316 };
317 #endif
318
319 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
320 /*
321 * Macro for converting signal number to a mask suitable for
322 * sigblock().
323 */
324 #define sigmask(m) (1 << ((m)-1))
325 #endif
326
327 #if __BSD_VISIBLE
328 #define BADSIG SIG_ERR
329 #endif
330
331 #if __POSIX_VISIBLE || __XSI_VISIBLE
332 /*
333 * Flags for sigprocmask:
334 */
335 #define SIG_BLOCK 1 /* block specified signal set */
336 #define SIG_UNBLOCK 2 /* unblock specified signal set */
337 #define SIG_SETMASK 3 /* set specified signal set */
338 #endif
339
340 /*
341 * For historical reasons; programs expect signal's return value to be
342 * defined by <sys/signal.h>.
343 */
344 __BEGIN_DECLS
345 __sighandler_t *signal(int, __sighandler_t *);
346 __END_DECLS
347
348 #endif /* !_SYS_SIGNAL_H_ */
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