master
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1989, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)signal.h 8.4 (Berkeley) 5/4/95
37 */
38
39#ifndef _SYS_SIGNAL_H_
40#define _SYS_SIGNAL_H_
41
42#include <sys/cdefs.h>
43#include <sys/_types.h>
44#include <sys/_sigset.h>
45#include <sys/_sigval.h>
46
47#include <machine/_limits.h> /* __MINSIGSTKSZ */
48#include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */
49
50#if __POSIX_VISIBLE >= 200809
51
52#include <sys/_pthreadtypes.h>
53#include <sys/_timespec.h>
54
55#ifndef _SIZE_T_DECLARED
56typedef __size_t size_t;
57#define _SIZE_T_DECLARED
58#endif
59
60#ifndef _UID_T_DECLARED
61typedef __uid_t uid_t;
62#define _UID_T_DECLARED
63#endif
64
65#endif /* __POSIX_VISIBLE >= 200809 */
66
67/*
68 * System defined signals.
69 */
70#if __POSIX_VISIBLE || __XSI_VISIBLE
71#define SIGHUP 1 /* hangup */
72#endif
73#define SIGINT 2 /* interrupt */
74#if __POSIX_VISIBLE || __XSI_VISIBLE
75#define SIGQUIT 3 /* quit */
76#endif
77#define SIGILL 4 /* illegal instr. (not reset when caught) */
78#if __XSI_VISIBLE
79#define SIGTRAP 5 /* trace trap (not reset when caught) */
80#endif
81#define SIGABRT 6 /* abort() */
82#if __BSD_VISIBLE
83#define SIGIOT SIGABRT /* compatibility */
84#define SIGEMT 7 /* EMT instruction */
85#endif
86#define SIGFPE 8 /* floating point exception */
87#if __POSIX_VISIBLE || __XSI_VISIBLE
88#define SIGKILL 9 /* kill (cannot be caught or ignored) */
89#endif
90#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
91#define SIGBUS 10 /* bus error */
92#endif
93#define SIGSEGV 11 /* segmentation violation */
94#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
95#define SIGSYS 12 /* non-existent system call invoked */
96#endif
97#if __POSIX_VISIBLE || __XSI_VISIBLE
98#define SIGPIPE 13 /* write on a pipe with no one to read it */
99#define SIGALRM 14 /* alarm clock */
100#endif
101#define SIGTERM 15 /* software termination signal from kill */
102#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
103#define SIGURG 16 /* urgent condition on IO channel */
104#endif
105#if __POSIX_VISIBLE || __XSI_VISIBLE
106#define SIGSTOP 17 /* sendable stop signal not from tty */
107#define SIGTSTP 18 /* stop signal from tty */
108#define SIGCONT 19 /* continue a stopped process */
109#define SIGCHLD 20 /* to parent on child stop or exit */
110#define SIGTTIN 21 /* to readers pgrp upon background tty read */
111#define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */
112#endif
113#if __BSD_VISIBLE
114#define SIGIO 23 /* input/output possible signal */
115#endif
116#if __XSI_VISIBLE
117#define SIGXCPU 24 /* exceeded CPU time limit */
118#define SIGXFSZ 25 /* exceeded file size limit */
119#define SIGVTALRM 26 /* virtual time alarm */
120#define SIGPROF 27 /* profiling time alarm */
121#endif
122#if __BSD_VISIBLE
123#define SIGWINCH 28 /* window size changes */
124#define SIGINFO 29 /* information request */
125#endif
126#if __POSIX_VISIBLE || __XSI_VISIBLE
127#define SIGUSR1 30 /* user defined signal 1 */
128#define SIGUSR2 31 /* user defined signal 2 */
129#endif
130#if __BSD_VISIBLE
131#define SIGTHR 32 /* reserved by thread library. */
132#define SIGLWP SIGTHR
133#define SIGLIBRT 33 /* reserved by real-time library. */
134#endif
135
136#define SIGRTMIN 65
137#define SIGRTMAX 126
138
139#define SIG_DFL ((__sighandler_t *)0)
140#define SIG_IGN ((__sighandler_t *)1)
141#define SIG_ERR ((__sighandler_t *)-1)
142/* #define SIG_CATCH ((__sighandler_t *)2) See signalvar.h */
143#define SIG_HOLD ((__sighandler_t *)3)
144
145/*
146 * Type of a signal handling function.
147 *
148 * Language spec sez signal handlers take exactly one arg, even though we
149 * actually supply three. Ugh!
150 *
151 * We don't try to hide the difference by leaving out the args because
152 * that would cause warnings about conformant programs. Nonconformant
153 * programs can avoid the warnings by casting to (__sighandler_t *) or
154 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
155 *
156 * The kernel should reverse the cast before calling the function. It
157 * has no way to do this, but on most machines 1-arg and 3-arg functions
158 * have the same calling protocol so there is no problem in practice.
159 * A bit in sa_flags could be used to specify the number of args.
160 */
161typedef void __sighandler_t(int);
162
163#if __POSIX_VISIBLE || __XSI_VISIBLE
164#ifndef _SIGSET_T_DECLARED
165#define _SIGSET_T_DECLARED
166typedef __sigset_t sigset_t;
167#endif
168#endif
169
170#if __POSIX_VISIBLE >= 199309
171
172struct pthread_attr;
173
174struct sigevent {
175 int sigev_notify; /* Notification type */
176 int sigev_signo; /* Signal number */
177 union sigval sigev_value; /* Signal value */
178 union {
179 __lwpid_t _threadid;
180 struct {
181 void (*_function)(union sigval);
182 struct pthread_attr **_attribute;
183 } _sigev_thread;
184 unsigned short _kevent_flags;
185 long __spare__[8];
186 } _sigev_un;
187};
188
189#if __BSD_VISIBLE
190#define sigev_notify_kqueue sigev_signo
191#define sigev_notify_kevent_flags _sigev_un._kevent_flags
192#define sigev_notify_thread_id _sigev_un._threadid
193#endif
194#define sigev_notify_function _sigev_un._sigev_thread._function
195#define sigev_notify_attributes _sigev_un._sigev_thread._attribute
196
197#define SIGEV_NONE 0 /* No async notification. */
198#define SIGEV_SIGNAL 1 /* Generate a queued signal. */
199#define SIGEV_THREAD 2 /* Call back from another pthread. */
200#if __BSD_VISIBLE
201#define SIGEV_KEVENT 3 /* Generate a kevent. */
202#define SIGEV_THREAD_ID 4 /* Send signal to a kernel thread. */
203#endif
204
205#endif /* __POSIX_VISIBLE >= 199309 */
206
207#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
208typedef struct __siginfo {
209 int si_signo; /* signal number */
210 int si_errno; /* errno association */
211 /*
212 * Cause of signal, one of the SI_ macros or signal-specific
213 * values, i.e. one of the FPE_... values for SIGFPE. This
214 * value is equivalent to the second argument to an old-style
215 * FreeBSD signal handler.
216 */
217 int si_code; /* signal code */
218 __pid_t si_pid; /* sending process */
219 __uid_t si_uid; /* sender's ruid */
220 int si_status; /* exit value */
221 void *si_addr; /* faulting instruction */
222 union sigval si_value; /* signal value */
223 union {
224 struct {
225 int _trapno;/* machine specific trap code */
226 } _fault;
227 struct {
228 int _timerid;
229 int _overrun;
230 } _timer;
231 struct {
232 int _mqd;
233 } _mesgq;
234 struct {
235 long _band; /* band event for SIGPOLL */
236 } _poll; /* was this ever used ? */
237 struct {
238 int _syscall; /* Syscall number for signals
239 * delivered as a result of
240 * system calls denied by
241 * Capsicum. */
242 } _capsicum;
243 struct {
244 long __spare1__;
245 int __spare2__[7];
246 } __spare__;
247 } _reason;
248} siginfo_t;
249
250#define si_trapno _reason._fault._trapno
251#define si_timerid _reason._timer._timerid
252#define si_overrun _reason._timer._overrun
253#define si_mqd _reason._mesgq._mqd
254#define si_band _reason._poll._band
255#define si_syscall _reason._capsicum._syscall
256
257#if defined(_WANT_LWPINFO32) || (defined(_KERNEL) && defined(__LP64__))
258struct siginfo32 {
259 int si_signo; /* signal number */
260 int si_errno; /* errno association */
261 int si_code; /* signal code */
262 __pid_t si_pid; /* sending process */
263 __uid_t si_uid; /* sender's ruid */
264 int si_status; /* exit value */
265 uint32_t si_addr; /* faulting instruction */
266 union sigval32 si_value; /* signal value */
267 union {
268 struct {
269 int _trapno;/* machine specific trap code */
270 } _fault;
271 struct {
272 int _timerid;
273 int _overrun;
274 } _timer;
275 struct {
276 int _mqd;
277 } _mesgq;
278 struct {
279 int32_t _band; /* band event for SIGPOLL */
280 } _poll; /* was this ever used ? */
281 struct {
282 int32_t __spare1__;
283 int __spare2__[7];
284 } __spare__;
285 } _reason;
286};
287#endif
288
289/** si_code **/
290/* codes for SIGILL */
291#define ILL_ILLOPC 1 /* Illegal opcode. */
292#define ILL_ILLOPN 2 /* Illegal operand. */
293#define ILL_ILLADR 3 /* Illegal addressing mode. */
294#define ILL_ILLTRP 4 /* Illegal trap. */
295#define ILL_PRVOPC 5 /* Privileged opcode. */
296#define ILL_PRVREG 6 /* Privileged register. */
297#define ILL_COPROC 7 /* Coprocessor error. */
298#define ILL_BADSTK 8 /* Internal stack error. */
299
300/* codes for SIGBUS */
301#define BUS_ADRALN 1 /* Invalid address alignment. */
302#define BUS_ADRERR 2 /* Nonexistent physical address. */
303#define BUS_OBJERR 3 /* Object-specific hardware error. */
304#define BUS_OOMERR 100 /* Non-standard: No memory. */
305
306/* codes for SIGSEGV */
307#define SEGV_MAPERR 1 /* Address not mapped to object. */
308#define SEGV_ACCERR 2 /* Invalid permissions for mapped */
309 /* object. */
310#define SEGV_PKUERR 100 /* x86: PKU violation */
311
312/* codes for SIGFPE */
313#define FPE_INTOVF 1 /* Integer overflow. */
314#define FPE_INTDIV 2 /* Integer divide by zero. */
315#define FPE_FLTDIV 3 /* Floating point divide by zero. */
316#define FPE_FLTOVF 4 /* Floating point overflow. */
317#define FPE_FLTUND 5 /* Floating point underflow. */
318#define FPE_FLTRES 6 /* Floating point inexact result. */
319#define FPE_FLTINV 7 /* Invalid floating point operation. */
320#define FPE_FLTSUB 8 /* Subscript out of range. */
321#define FPE_FLTIDO 9 /* Input denormal operation */
322
323/* codes for SIGTRAP */
324#define TRAP_BRKPT 1 /* Process breakpoint. */
325#define TRAP_TRACE 2 /* Process trace trap. */
326#define TRAP_DTRACE 3 /* DTrace induced trap. */
327#define TRAP_CAP 4 /* Capabilities protective trap. */
328
329/* codes for SIGCHLD */
330#define CLD_EXITED 1 /* Child has exited */
331#define CLD_KILLED 2 /* Child has terminated abnormally but */
332 /* did not create a core file */
333#define CLD_DUMPED 3 /* Child has terminated abnormally and */
334 /* created a core file */
335#define CLD_TRAPPED 4 /* Traced child has trapped */
336#define CLD_STOPPED 5 /* Child has stopped */
337#define CLD_CONTINUED 6 /* Stopped child has continued */
338
339/* codes for SIGPOLL */
340#define POLL_IN 1 /* Data input available */
341#define POLL_OUT 2 /* Output buffers available */
342#define POLL_MSG 3 /* Input message available */
343#define POLL_ERR 4 /* I/O Error */
344#define POLL_PRI 5 /* High priority input available */
345#define POLL_HUP 6 /* Device disconnected */
346
347#endif
348
349#if __POSIX_VISIBLE || __XSI_VISIBLE
350struct __siginfo;
351
352/*
353 * Signal vector "template" used in sigaction call.
354 */
355struct sigaction {
356 union {
357 void (*__sa_handler)(int);
358 void (*__sa_sigaction)(int, struct __siginfo *, void *);
359 } __sigaction_u; /* signal handler */
360 int sa_flags; /* see signal options below */
361 sigset_t sa_mask; /* signal mask to apply */
362};
363
364#define sa_handler __sigaction_u.__sa_handler
365#endif
366
367#if __XSI_VISIBLE
368/* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
369#define sa_sigaction __sigaction_u.__sa_sigaction
370#endif
371
372#if __POSIX_VISIBLE || __XSI_VISIBLE
373#define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
374#endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
375
376#if __XSI_VISIBLE
377#define SA_ONSTACK 0x0001 /* take signal on signal stack */
378#define SA_RESTART 0x0002 /* restart system call on signal return */
379#define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
380#define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
381#define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
382#define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
383#endif
384
385#if __BSD_VISIBLE
386#define NSIG 32 /* number of old signals (counting 0) */
387#endif
388
389#if __POSIX_VISIBLE || __XSI_VISIBLE
390#define SI_NOINFO 0 /* No signal info besides si_signo. */
391#define SI_USER 0x10001 /* Signal sent by kill(). */
392#define SI_QUEUE 0x10002 /* Signal sent by the sigqueue(). */
393#define SI_TIMER 0x10003 /* Signal generated by expiration of */
394 /* a timer set by timer_settime(). */
395#define SI_ASYNCIO 0x10004 /* Signal generated by completion of */
396 /* an asynchronous I/O request.*/
397#define SI_MESGQ 0x10005 /* Signal generated by arrival of a */
398 /* message on an empty message queue. */
399#define SI_KERNEL 0x10006
400#define SI_LWP 0x10007 /* Signal sent by thr_kill */
401#endif
402#if __BSD_VISIBLE
403#define SI_UNDEFINED 0
404#endif
405
406#if __BSD_VISIBLE
407typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
408typedef void __siginfohandler_t(int, struct __siginfo *, void *);
409#endif
410
411#if __XSI_VISIBLE
412#if __BSD_VISIBLE
413#define __stack_t sigaltstack
414#endif
415typedef struct __stack_t stack_t;
416
417#define SS_ONSTACK 0x0001 /* take signal on alternate stack */
418#define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
419#define MINSIGSTKSZ __MINSIGSTKSZ /* minimum stack size */
420#define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
421#endif
422
423/*
424 * Structure used in sigaltstack call. Its definition is always
425 * needed for __ucontext. If __BSD_VISIBLE is defined, the structure
426 * tag is actually sigaltstack.
427 */
428struct __stack_t {
429 void *ss_sp; /* signal stack base */
430 __size_t ss_size; /* signal stack length */
431 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
432};
433
434#if __BSD_VISIBLE
435/*
436 * 4.3 compatibility:
437 * Signal vector "template" used in sigvec call.
438 */
439struct sigvec {
440 __sighandler_t *sv_handler; /* signal handler */
441 int sv_mask; /* signal mask to apply */
442 int sv_flags; /* see signal options below */
443};
444
445#define SV_ONSTACK SA_ONSTACK
446#define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
447#define SV_RESETHAND SA_RESETHAND
448#define SV_NODEFER SA_NODEFER
449#define SV_NOCLDSTOP SA_NOCLDSTOP
450#define SV_SIGINFO SA_SIGINFO
451#define sv_onstack sv_flags /* isn't compatibility wonderful! */
452#endif
453
454/* Keep this in one place only */
455#if defined(_KERNEL) && defined(COMPAT_43) && \
456 !defined(__i386__)
457struct osigcontext {
458 int _not_used;
459};
460#endif
461
462#if __XSI_VISIBLE
463/*
464 * Structure used in sigstack call.
465 */
466struct sigstack {
467 void *ss_sp; /* signal stack pointer */
468 int ss_onstack; /* current status */
469};
470#endif
471
472#if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
473/*
474 * Macro for converting signal number to a mask suitable for
475 * sigblock().
476 */
477#define sigmask(m) (1 << ((m)-1))
478#endif
479
480#if __BSD_VISIBLE
481#define BADSIG SIG_ERR
482
483/* sigqueue(2) signo high-bits flags */
484#define __SIGQUEUE_TID 0x80000000 /* queue for tid, instead of pid */
485#define __SIGQUEUE_RSRV 0x40000000 /* reserved */
486#endif
487
488#if __POSIX_VISIBLE || __XSI_VISIBLE
489/*
490 * Flags for sigprocmask:
491 */
492#define SIG_BLOCK 1 /* block specified signal set */
493#define SIG_UNBLOCK 2 /* unblock specified signal set */
494#define SIG_SETMASK 3 /* set specified signal set */
495#endif
496
497/*
498 * For historical reasons; programs expect signal's return value to be
499 * defined by <sys/signal.h>.
500 */
501__BEGIN_DECLS
502__sighandler_t *signal(int, __sighandler_t *);
503__END_DECLS
504
505#endif /* !_SYS_SIGNAL_H_ */