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
37#ifndef _SYS_SIGNAL_H_
38#define _SYS_SIGNAL_H_
39
40#include <sys/cdefs.h>
41#include <sys/_types.h>
42#include <sys/_sigset.h>
43#include <sys/_sigaltstack.h>
44#include <sys/_sigval.h>
45
46#include <machine/_limits.h> /* __MINSIGSTKSZ */
47#include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */
48
49#if __POSIX_VISIBLE >= 200809
50
51#include <sys/_pthreadtypes.h>
52#include <sys/_timespec.h>
53
54#ifndef _SIZE_T_DECLARED
55typedef __size_t size_t;
56#define _SIZE_T_DECLARED
57#endif
58
59#ifndef _UID_T_DECLARED
60typedef __uid_t uid_t;
61#define _UID_T_DECLARED
62#endif
63
64#endif /* __POSIX_VISIBLE >= 200809 */
65
66/*
67 * System defined signals.
68 */
69#if __POSIX_VISIBLE || __XSI_VISIBLE
70#define SIGHUP 1 /* hangup */
71#endif
72#define SIGINT 2 /* interrupt */
73#if __POSIX_VISIBLE || __XSI_VISIBLE
74#define SIGQUIT 3 /* quit */
75#endif
76#define SIGILL 4 /* illegal instr. (not reset when caught) */
77#if __XSI_VISIBLE
78#define SIGTRAP 5 /* trace trap (not reset when caught) */
79#endif
80#define SIGABRT 6 /* abort() */
81#if __BSD_VISIBLE
82#define SIGIOT SIGABRT /* compatibility */
83#define SIGEMT 7 /* EMT instruction */
84#endif
85#define SIGFPE 8 /* floating point exception */
86#if __POSIX_VISIBLE || __XSI_VISIBLE
87#define SIGKILL 9 /* kill (cannot be caught or ignored) */
88#endif
89#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
90#define SIGBUS 10 /* bus error */
91#endif
92#define SIGSEGV 11 /* segmentation violation */
93#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
94#define SIGSYS 12 /* non-existent system call invoked */
95#endif
96#if __POSIX_VISIBLE || __XSI_VISIBLE
97#define SIGPIPE 13 /* write on a pipe with no one to read it */
98#define SIGALRM 14 /* alarm clock */
99#endif
100#define SIGTERM 15 /* software termination signal from kill */
101#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
102#define SIGURG 16 /* urgent condition on IO channel */
103#endif
104#if __POSIX_VISIBLE || __XSI_VISIBLE
105#define SIGSTOP 17 /* sendable stop signal not from tty */
106#define SIGTSTP 18 /* stop signal from tty */
107#define SIGCONT 19 /* continue a stopped process */
108#define SIGCHLD 20 /* to parent on child stop or exit */
109#define SIGTTIN 21 /* to readers pgrp upon background tty read */
110#define SIGTTOU 22 /* like TTIN if (tp->t_local&LTOSTOP) */
111#endif
112#if __BSD_VISIBLE
113#define SIGIO 23 /* input/output possible signal */
114#endif
115#if __XSI_VISIBLE
116#define SIGXCPU 24 /* exceeded CPU time limit */
117#define SIGXFSZ 25 /* exceeded file size limit */
118#define SIGVTALRM 26 /* virtual time alarm */
119#define SIGPROF 27 /* profiling time alarm */
120#endif
121#if __BSD_VISIBLE
122#define SIGWINCH 28 /* window size changes */
123#define SIGINFO 29 /* information request */
124#endif
125#if __POSIX_VISIBLE || __XSI_VISIBLE
126#define SIGUSR1 30 /* user defined signal 1 */
127#define SIGUSR2 31 /* user defined signal 2 */
128#endif
129#if __BSD_VISIBLE
130#define SIGTHR 32 /* reserved by thread library. */
131#define SIGLWP SIGTHR
132#define SIGLIBRT 33 /* reserved by real-time library. */
133#endif
134
135#define SIGRTMIN 65
136#define SIGRTMAX 126
137
138#define SIG_DFL ((__sighandler_t *)0)
139#define SIG_IGN ((__sighandler_t *)1)
140#define SIG_ERR ((__sighandler_t *)-1)
141/* #define SIG_CATCH ((__sighandler_t *)2) See signalvar.h */
142#define SIG_HOLD ((__sighandler_t *)3)
143
144/*
145 * Type of a signal handling function.
146 *
147 * Language spec sez signal handlers take exactly one arg, even though we
148 * actually supply three. Ugh!
149 *
150 * We don't try to hide the difference by leaving out the args because
151 * that would cause warnings about conformant programs. Nonconformant
152 * programs can avoid the warnings by casting to (__sighandler_t *) or
153 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
154 *
155 * The kernel should reverse the cast before calling the function. It
156 * has no way to do this, but on most machines 1-arg and 3-arg functions
157 * have the same calling protocol so there is no problem in practice.
158 * A bit in sa_flags could be used to specify the number of args.
159 */
160typedef void __sighandler_t(int);
161
162#if __POSIX_VISIBLE || __XSI_VISIBLE
163#ifndef _SIGSET_T_DECLARED
164#define _SIGSET_T_DECLARED
165typedef __sigset_t sigset_t;
166#endif
167#endif
168
169#if __POSIX_VISIBLE >= 199309
170
171struct pthread_attr;
172
173struct sigevent {
174 int sigev_notify; /* Notification type */
175 int sigev_signo; /* Signal number */
176 union sigval sigev_value; /* Signal value */
177 union {
178 __lwpid_t _threadid;
179 struct {
180 void (*_function)(union sigval);
181 struct pthread_attr **_attribute;
182 } _sigev_thread;
183 unsigned short _kevent_flags;
184 long __spare__[8];
185 } _sigev_un;
186};
187
188#if __BSD_VISIBLE
189#define sigev_notify_kqueue sigev_signo
190#define sigev_notify_kevent_flags _sigev_un._kevent_flags
191#define sigev_notify_thread_id _sigev_un._threadid
192#endif
193#define sigev_notify_function _sigev_un._sigev_thread._function
194#define sigev_notify_attributes _sigev_un._sigev_thread._attribute
195
196#define SIGEV_NONE 0 /* No async notification. */
197#define SIGEV_SIGNAL 1 /* Generate a queued signal. */
198#define SIGEV_THREAD 2 /* Call back from another pthread. */
199#if __BSD_VISIBLE
200#define SIGEV_KEVENT 3 /* Generate a kevent. */
201#define SIGEV_THREAD_ID 4 /* Send signal to a kernel thread. */
202#endif
203
204#endif /* __POSIX_VISIBLE >= 199309 */
205
206#if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
207typedef struct __siginfo {
208 int si_signo; /* signal number */
209 int si_errno; /* errno association */
210 /*
211 * Cause of signal, one of the SI_ macros or signal-specific
212 * values, i.e. one of the FPE_... values for SIGFPE. This
213 * value is equivalent to the second argument to an old-style
214 * FreeBSD signal handler.
215 */
216 int si_code; /* signal code */
217 __pid_t si_pid; /* sending process */
218 __uid_t si_uid; /* sender's ruid */
219 int si_status; /* exit value */
220 void *si_addr; /* faulting instruction */
221 union sigval si_value; /* signal value */
222 union {
223 struct {
224 int _trapno;/* machine specific trap code */
225 } _fault;
226 struct {
227 int _timerid;
228 int _overrun;
229 } _timer;
230 struct {
231 int _mqd;
232 } _mesgq;
233 struct {
234 long _band; /* band event for SIGPOLL */
235 } _poll; /* was this ever used ? */
236 struct {
237 int _syscall; /* Syscall number for signals
238 * delivered as a result of
239 * system calls denied by
240 * Capsicum. */
241 } _capsicum;
242 struct {
243 long __spare1__;
244 int __spare2__[7];
245 } __spare__;
246 } _reason;
247} siginfo_t;
248
249#define si_trapno _reason._fault._trapno
250#define si_timerid _reason._timer._timerid
251#define si_overrun _reason._timer._overrun
252#define si_mqd _reason._mesgq._mqd
253#define si_band _reason._poll._band
254#define si_syscall _reason._capsicum._syscall
255
256#if defined(_WANT_LWPINFO32) || (defined(_KERNEL) && defined(__LP64__))
257struct __siginfo32 {
258 int si_signo; /* signal number */
259 int si_errno; /* errno association */
260 int si_code; /* signal code */
261 __pid_t si_pid; /* sending process */
262 __uid_t si_uid; /* sender's ruid */
263 int si_status; /* exit value */
264 uint32_t si_addr; /* faulting instruction */
265 union sigval32 si_value; /* signal value */
266 union {
267 struct {
268 int _trapno;/* machine specific trap code */
269 } _fault;
270 struct {
271 int _timerid;
272 int _overrun;
273 } _timer;
274 struct {
275 int _mqd;
276 } _mesgq;
277 struct {
278 int32_t _band; /* band event for SIGPOLL */
279 } _poll; /* was this ever used ? */
280 struct {
281 int32_t __spare1__;
282 int __spare2__[7];
283 } __spare__;
284 } _reason;
285};
286#endif
287
288/** si_code **/
289/* codes for SIGILL */
290#define ILL_ILLOPC 1 /* Illegal opcode. */
291#define ILL_ILLOPN 2 /* Illegal operand. */
292#define ILL_ILLADR 3 /* Illegal addressing mode. */
293#define ILL_ILLTRP 4 /* Illegal trap. */
294#define ILL_PRVOPC 5 /* Privileged opcode. */
295#define ILL_PRVREG 6 /* Privileged register. */
296#define ILL_COPROC 7 /* Coprocessor error. */
297#define ILL_BADSTK 8 /* Internal stack error. */
298
299/* codes for SIGBUS */
300#define BUS_ADRALN 1 /* Invalid address alignment. */
301#define BUS_ADRERR 2 /* Nonexistent physical address. */
302#define BUS_OBJERR 3 /* Object-specific hardware error. */
303#define BUS_OOMERR 100 /* Non-standard: No memory. */
304
305/* codes for SIGSEGV */
306#define SEGV_MAPERR 1 /* Address not mapped to object. */
307#define SEGV_ACCERR 2 /* Invalid permissions for mapped */
308 /* object. */
309#define SEGV_PKUERR 100 /* x86: PKU violation */
310
311/* codes for SIGFPE */
312#define FPE_INTOVF 1 /* Integer overflow. */
313#define FPE_INTDIV 2 /* Integer divide by zero. */
314#define FPE_FLTDIV 3 /* Floating point divide by zero. */
315#define FPE_FLTOVF 4 /* Floating point overflow. */
316#define FPE_FLTUND 5 /* Floating point underflow. */
317#define FPE_FLTRES 6 /* Floating point inexact result. */
318#define FPE_FLTINV 7 /* Invalid floating point operation. */
319#define FPE_FLTSUB 8 /* Subscript out of range. */
320#define FPE_FLTIDO 9 /* Input denormal operation */
321
322/* codes for SIGTRAP */
323#define TRAP_BRKPT 1 /* Process breakpoint. */
324#define TRAP_TRACE 2 /* Process trace trap. */
325#define TRAP_DTRACE 3 /* DTrace induced trap. */
326#define TRAP_CAP 4 /* Capabilities protective trap. */
327
328/* codes for SIGCHLD */
329#define CLD_EXITED 1 /* Child has exited */
330#define CLD_KILLED 2 /* Child has terminated abnormally but */
331 /* did not create a core file */
332#define CLD_DUMPED 3 /* Child has terminated abnormally and */
333 /* created a core file */
334#define CLD_TRAPPED 4 /* Traced child has trapped */
335#define CLD_STOPPED 5 /* Child has stopped */
336#define CLD_CONTINUED 6 /* Stopped child has continued */
337
338/* codes for SIGPOLL */
339#define POLL_IN 1 /* Data input available */
340#define POLL_OUT 2 /* Output buffers available */
341#define POLL_MSG 3 /* Input message available */
342#define POLL_ERR 4 /* I/O Error */
343#define POLL_PRI 5 /* High priority input available */
344#define POLL_HUP 6 /* Device disconnected */
345
346#endif
347
348#if __POSIX_VISIBLE || __XSI_VISIBLE
349struct __siginfo;
350
351/*
352 * Signal vector "template" used in sigaction call.
353 */
354struct sigaction {
355 union {
356 void (*__sa_handler)(int);
357 void (*__sa_sigaction)(int, struct __siginfo *, void *);
358 } __sigaction_u; /* signal handler */
359 int sa_flags; /* see signal options below */
360 sigset_t sa_mask; /* signal mask to apply */
361};
362
363#define sa_handler __sigaction_u.__sa_handler
364#endif
365
366#if __XSI_VISIBLE
367/* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
368#define sa_sigaction __sigaction_u.__sa_sigaction
369#endif
370
371#if __POSIX_VISIBLE || __XSI_VISIBLE
372#define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
373#endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
374
375#if __XSI_VISIBLE || __POSIX_VISIBLE >= 200809
376#define SA_ONSTACK 0x0001 /* take signal on signal stack */
377#define SA_RESTART 0x0002 /* restart system call on signal return */
378#define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
379#define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
380#define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
381#define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
382#endif
383
384#if __BSD_VISIBLE
385#define NSIG 32 /* number of old signals (counting 0) */
386#endif
387
388#if __POSIX_VISIBLE || __XSI_VISIBLE
389#define SI_NOINFO 0 /* No signal info besides si_signo. */
390#define SI_USER 0x10001 /* Signal sent by kill(). */
391#define SI_QUEUE 0x10002 /* Signal sent by the sigqueue(). */
392#define SI_TIMER 0x10003 /* Signal generated by expiration of */
393 /* a timer set by timer_settime(). */
394#define SI_ASYNCIO 0x10004 /* Signal generated by completion of */
395 /* an asynchronous I/O request.*/
396#define SI_MESGQ 0x10005 /* Signal generated by arrival of a */
397 /* message on an empty message queue. */
398#define SI_KERNEL 0x10006
399#define SI_LWP 0x10007 /* Signal sent by thr_kill */
400#endif
401#if __BSD_VISIBLE
402#define SI_UNDEFINED 0
403#endif
404
405#if __BSD_VISIBLE
406typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
407typedef void __siginfohandler_t(int, struct __siginfo *, void *);
408#endif
409
410#if __BSD_VISIBLE
411/*
412 * 4.3 compatibility:
413 * Signal vector "template" used in sigvec call.
414 */
415struct sigvec {
416 __sighandler_t *sv_handler; /* signal handler */
417 int sv_mask; /* signal mask to apply */
418 int sv_flags; /* see signal options below */
419};
420
421#define SV_ONSTACK SA_ONSTACK
422#define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
423#define SV_RESETHAND SA_RESETHAND
424#define SV_NODEFER SA_NODEFER
425#define SV_NOCLDSTOP SA_NOCLDSTOP
426#define SV_SIGINFO SA_SIGINFO
427#define sv_onstack sv_flags /* isn't compatibility wonderful! */
428#endif
429
430/* Keep this in one place only */
431#if defined(_KERNEL) && defined(COMPAT_43) && \
432 !defined(__i386__)
433struct osigcontext {
434 int _not_used;
435};
436#endif
437
438#if __XSI_VISIBLE
439/*
440 * Structure used in sigstack call.
441 */
442struct sigstack {
443 void *ss_sp; /* signal stack pointer */
444 int ss_onstack; /* current status */
445};
446#endif
447
448#if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
449/*
450 * Macro for converting signal number to a mask suitable for
451 * sigblock().
452 */
453#define sigmask(m) (1 << ((m)-1))
454#endif
455
456#if __BSD_VISIBLE
457#define BADSIG SIG_ERR
458
459/* sigqueue(2) signo high-bits flags */
460#define __SIGQUEUE_TID 0x80000000 /* queue for tid, instead of pid */
461#define __SIGQUEUE_RSRV 0x40000000 /* reserved */
462#endif
463
464#if __POSIX_VISIBLE || __XSI_VISIBLE
465/*
466 * Flags for sigprocmask:
467 */
468#define SIG_BLOCK 1 /* block specified signal set */
469#define SIG_UNBLOCK 2 /* unblock specified signal set */
470#define SIG_SETMASK 3 /* set specified signal set */
471#endif
472
473/*
474 * For historical reasons; programs expect signal's return value to be
475 * defined by <sys/signal.h>.
476 */
477__BEGIN_DECLS
478__sighandler_t *signal(int, __sighandler_t *);
479__END_DECLS
480
481#endif /* !_SYS_SIGNAL_H_ */