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34 * @(#)signal.h 8.4 (Berkeley) 5/4/95
38 #ifndef _SYS_SIGNAL_H_
39 #define _SYS_SIGNAL_H_
41 #include <sys/cdefs.h>
42 #include <sys/_types.h>
43 #include <sys/_sigset.h>
45 #include <machine/_limits.h> /* __MINSIGSTKSZ */
46 #include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */
48 #if __POSIX_VISIBLE >= 200809
50 #include <sys/_pthreadtypes.h>
51 #include <sys/_timespec.h>
53 #ifndef _SIZE_T_DECLARED
54 typedef __size_t size_t;
55 #define _SIZE_T_DECLARED
58 #ifndef _UID_T_DECLARED
59 typedef __uid_t uid_t;
60 #define _UID_T_DECLARED
63 #endif /* __POSIX_VISIBLE >= 200809 */
66 * System defined signals.
68 #if __POSIX_VISIBLE || __XSI_VISIBLE
69 #define SIGHUP 1 /* hangup */
71 #define SIGINT 2 /* interrupt */
72 #if __POSIX_VISIBLE || __XSI_VISIBLE
73 #define SIGQUIT 3 /* quit */
75 #define SIGILL 4 /* illegal instr. (not reset when caught) */
77 #define SIGTRAP 5 /* trace trap (not reset when caught) */
79 #define SIGABRT 6 /* abort() */
81 #define SIGIOT SIGABRT /* compatibility */
82 #define SIGEMT 7 /* EMT instruction */
84 #define SIGFPE 8 /* floating point exception */
85 #if __POSIX_VISIBLE || __XSI_VISIBLE
86 #define SIGKILL 9 /* kill (cannot be caught or ignored) */
88 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
89 #define SIGBUS 10 /* bus error */
91 #define SIGSEGV 11 /* segmentation violation */
92 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
93 #define SIGSYS 12 /* non-existent system call invoked */
95 #if __POSIX_VISIBLE || __XSI_VISIBLE
96 #define SIGPIPE 13 /* write on a pipe with no one to read it */
97 #define SIGALRM 14 /* alarm clock */
99 #define SIGTERM 15 /* software termination signal from kill */
100 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
101 #define SIGURG 16 /* urgent condition on IO channel */
103 #if __POSIX_VISIBLE || __XSI_VISIBLE
104 #define SIGSTOP 17 /* sendable stop signal not from tty */
105 #define SIGTSTP 18 /* stop signal from tty */
106 #define SIGCONT 19 /* continue a stopped process */
107 #define SIGCHLD 20 /* to parent on child stop or exit */
108 #define SIGTTIN 21 /* to readers pgrp upon background tty read */
109 #define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */
112 #define SIGIO 23 /* input/output possible signal */
115 #define SIGXCPU 24 /* exceeded CPU time limit */
116 #define SIGXFSZ 25 /* exceeded file size limit */
117 #define SIGVTALRM 26 /* virtual time alarm */
118 #define SIGPROF 27 /* profiling time alarm */
121 #define SIGWINCH 28 /* window size changes */
122 #define SIGINFO 29 /* information request */
124 #if __POSIX_VISIBLE || __XSI_VISIBLE
125 #define SIGUSR1 30 /* user defined signal 1 */
126 #define SIGUSR2 31 /* user defined signal 2 */
129 #define SIGTHR 32 /* reserved by thread library. */
130 #define SIGLWP SIGTHR
131 #define SIGLIBRT 33 /* reserved by real-time library. */
137 #define SIG_DFL ((__sighandler_t *)0)
138 #define SIG_IGN ((__sighandler_t *)1)
139 #define SIG_ERR ((__sighandler_t *)-1)
140 /* #define SIG_CATCH ((__sighandler_t *)2) See signalvar.h */
141 #define SIG_HOLD ((__sighandler_t *)3)
144 * Type of a signal handling function.
146 * Language spec sez signal handlers take exactly one arg, even though we
147 * actually supply three. Ugh!
149 * We don't try to hide the difference by leaving out the args because
150 * that would cause warnings about conformant programs. Nonconformant
151 * programs can avoid the warnings by casting to (__sighandler_t *) or
152 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
154 * The kernel should reverse the cast before calling the function. It
155 * has no way to do this, but on most machines 1-arg and 3-arg functions
156 * have the same calling protocol so there is no problem in practice.
157 * A bit in sa_flags could be used to specify the number of args.
159 typedef void __sighandler_t(int);
161 #if __POSIX_VISIBLE || __XSI_VISIBLE
162 #ifndef _SIGSET_T_DECLARED
163 #define _SIGSET_T_DECLARED
164 typedef __sigset_t sigset_t;
168 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
170 /* Members as suggested by Annex C of POSIX 1003.1b. */
173 /* 6.0 compatibility */
179 #if __POSIX_VISIBLE >= 199309
184 int sigev_notify; /* Notification type */
185 int sigev_signo; /* Signal number */
186 union sigval sigev_value; /* Signal value */
190 void (*_function)(union sigval);
191 struct pthread_attr **_attribute;
193 unsigned short _kevent_flags;
199 #define sigev_notify_kqueue sigev_signo
200 #define sigev_notify_kevent_flags _sigev_un._kevent_flags
201 #define sigev_notify_thread_id _sigev_un._threadid
203 #define sigev_notify_function _sigev_un._sigev_thread._function
204 #define sigev_notify_attributes _sigev_un._sigev_thread._attribute
206 #define SIGEV_NONE 0 /* No async notification. */
207 #define SIGEV_SIGNAL 1 /* Generate a queued signal. */
208 #define SIGEV_THREAD 2 /* Call back from another pthread. */
210 #define SIGEV_KEVENT 3 /* Generate a kevent. */
211 #define SIGEV_THREAD_ID 4 /* Send signal to a kernel thread. */
214 #endif /* __POSIX_VISIBLE >= 199309 */
216 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
217 typedef struct __siginfo {
218 int si_signo; /* signal number */
219 int si_errno; /* errno association */
221 * Cause of signal, one of the SI_ macros or signal-specific
222 * values, i.e. one of the FPE_... values for SIGFPE. This
223 * value is equivalent to the second argument to an old-style
224 * FreeBSD signal handler.
226 int si_code; /* signal code */
227 __pid_t si_pid; /* sending process */
228 __uid_t si_uid; /* sender's ruid */
229 int si_status; /* exit value */
230 void *si_addr; /* faulting instruction */
231 union sigval si_value; /* signal value */
234 int _trapno;/* machine specific trap code */
244 long _band; /* band event for SIGPOLL */
245 } _poll; /* was this ever used ? */
253 #define si_trapno _reason._fault._trapno
254 #define si_timerid _reason._timer._timerid
255 #define si_overrun _reason._timer._overrun
256 #define si_mqd _reason._mesgq._mqd
257 #define si_band _reason._poll._band
260 /* codes for SIGILL */
261 #define ILL_ILLOPC 1 /* Illegal opcode. */
262 #define ILL_ILLOPN 2 /* Illegal operand. */
263 #define ILL_ILLADR 3 /* Illegal addressing mode. */
264 #define ILL_ILLTRP 4 /* Illegal trap. */
265 #define ILL_PRVOPC 5 /* Privileged opcode. */
266 #define ILL_PRVREG 6 /* Privileged register. */
267 #define ILL_COPROC 7 /* Coprocessor error. */
268 #define ILL_BADSTK 8 /* Internal stack error. */
270 /* codes for SIGBUS */
271 #define BUS_ADRALN 1 /* Invalid address alignment. */
272 #define BUS_ADRERR 2 /* Nonexistent physical address. */
273 #define BUS_OBJERR 3 /* Object-specific hardware error. */
275 /* codes for SIGSEGV */
276 #define SEGV_MAPERR 1 /* Address not mapped to object. */
277 #define SEGV_ACCERR 2 /* Invalid permissions for mapped */
280 /* codes for SIGFPE */
281 #define FPE_INTOVF 1 /* Integer overflow. */
282 #define FPE_INTDIV 2 /* Integer divide by zero. */
283 #define FPE_FLTDIV 3 /* Floating point divide by zero. */
284 #define FPE_FLTOVF 4 /* Floating point overflow. */
285 #define FPE_FLTUND 5 /* Floating point underflow. */
286 #define FPE_FLTRES 6 /* Floating point inexact result. */
287 #define FPE_FLTINV 7 /* Invalid floating point operation. */
288 #define FPE_FLTSUB 8 /* Subscript out of range. */
290 /* codes for SIGTRAP */
291 #define TRAP_BRKPT 1 /* Process breakpoint. */
292 #define TRAP_TRACE 2 /* Process trace trap. */
293 #define TRAP_DTRACE 3 /* DTrace induced trap. */
294 #define TRAP_CAP 4 /* Capabilities protective trap. */
296 /* codes for SIGCHLD */
297 #define CLD_EXITED 1 /* Child has exited */
298 #define CLD_KILLED 2 /* Child has terminated abnormally but */
299 /* did not create a core file */
300 #define CLD_DUMPED 3 /* Child has terminated abnormally and */
301 /* created a core file */
302 #define CLD_TRAPPED 4 /* Traced child has trapped */
303 #define CLD_STOPPED 5 /* Child has stopped */
304 #define CLD_CONTINUED 6 /* Stopped child has continued */
306 /* codes for SIGPOLL */
307 #define POLL_IN 1 /* Data input available */
308 #define POLL_OUT 2 /* Output buffers available */
309 #define POLL_MSG 3 /* Input message available */
310 #define POLL_ERR 4 /* I/O Error */
311 #define POLL_PRI 5 /* High priority input available */
312 #define POLL_HUP 6 /* Device disconnected */
316 #if __POSIX_VISIBLE || __XSI_VISIBLE
320 * Signal vector "template" used in sigaction call.
324 void (*__sa_handler)(int);
325 void (*__sa_sigaction)(int, struct __siginfo *, void *);
326 } __sigaction_u; /* signal handler */
327 int sa_flags; /* see signal options below */
328 sigset_t sa_mask; /* signal mask to apply */
331 #define sa_handler __sigaction_u.__sa_handler
335 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
336 #define sa_sigaction __sigaction_u.__sa_sigaction
339 #if __POSIX_VISIBLE || __XSI_VISIBLE
340 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
341 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
344 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
345 #define SA_RESTART 0x0002 /* restart system call on signal return */
346 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
347 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
348 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
349 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
353 #define NSIG 32 /* number of old signals (counting 0) */
356 #if __POSIX_VISIBLE || __XSI_VISIBLE
357 #define SI_NOINFO 0 /* No signal info besides si_signo. */
358 #define SI_USER 0x10001 /* Signal sent by kill(). */
359 #define SI_QUEUE 0x10002 /* Signal sent by the sigqueue(). */
360 #define SI_TIMER 0x10003 /* Signal generated by expiration of */
361 /* a timer set by timer_settime(). */
362 #define SI_ASYNCIO 0x10004 /* Signal generated by completion of */
363 /* an asynchronous I/O request.*/
364 #define SI_MESGQ 0x10005 /* Signal generated by arrival of a */
365 /* message on an empty message queue. */
366 #define SI_KERNEL 0x10006
367 #define SI_LWP 0x10007 /* Signal sent by thr_kill */
370 #define SI_UNDEFINED 0
374 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
375 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
380 #define __stack_t sigaltstack
382 typedef struct __stack_t stack_t;
384 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
385 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
386 #define MINSIGSTKSZ __MINSIGSTKSZ /* minimum stack size */
387 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
391 * Structure used in sigaltstack call. Its definition is always
392 * needed for __ucontext. If __BSD_VISIBLE is defined, the structure
393 * tag is actually sigaltstack.
396 void *ss_sp; /* signal stack base */
397 __size_t ss_size; /* signal stack length */
398 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
404 * Signal vector "template" used in sigvec call.
407 __sighandler_t *sv_handler; /* signal handler */
408 int sv_mask; /* signal mask to apply */
409 int sv_flags; /* see signal options below */
412 #define SV_ONSTACK SA_ONSTACK
413 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
414 #define SV_RESETHAND SA_RESETHAND
415 #define SV_NODEFER SA_NODEFER
416 #define SV_NOCLDSTOP SA_NOCLDSTOP
417 #define SV_SIGINFO SA_SIGINFO
418 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
421 /* Keep this in one place only */
422 #if defined(_KERNEL) && defined(COMPAT_43) && \
431 * Structure used in sigstack call.
434 void *ss_sp; /* signal stack pointer */
435 int ss_onstack; /* current status */
439 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
441 * Macro for converting signal number to a mask suitable for
444 #define sigmask(m) (1 << ((m)-1))
448 #define BADSIG SIG_ERR
451 #if __POSIX_VISIBLE || __XSI_VISIBLE
453 * Flags for sigprocmask:
455 #define SIG_BLOCK 1 /* block specified signal set */
456 #define SIG_UNBLOCK 2 /* unblock specified signal set */
457 #define SIG_SETMASK 3 /* set specified signal set */
461 * For historical reasons; programs expect signal's return value to be
462 * defined by <sys/signal.h>.
465 __sighandler_t *signal(int, __sighandler_t *);
468 #endif /* !_SYS_SIGNAL_H_ */