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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 */
49 * System defined signals.
51 #if __POSIX_VISIBLE || __XSI_VISIBLE
52 #define SIGHUP 1 /* hangup */
54 #define SIGINT 2 /* interrupt */
55 #if __POSIX_VISIBLE || __XSI_VISIBLE
56 #define SIGQUIT 3 /* quit */
58 #define SIGILL 4 /* illegal instr. (not reset when caught) */
60 #define SIGTRAP 5 /* trace trap (not reset when caught) */
62 #define SIGABRT 6 /* abort() */
64 #define SIGIOT SIGABRT /* compatibility */
65 #define SIGEMT 7 /* EMT instruction */
67 #define SIGFPE 8 /* floating point exception */
68 #if __POSIX_VISIBLE || __XSI_VISIBLE
69 #define SIGKILL 9 /* kill (cannot be caught or ignored) */
71 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
72 #define SIGBUS 10 /* bus error */
74 #define SIGSEGV 11 /* segmentation violation */
75 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
76 #define SIGSYS 12 /* non-existent system call invoked */
78 #if __POSIX_VISIBLE || __XSI_VISIBLE
79 #define SIGPIPE 13 /* write on a pipe with no one to read it */
80 #define SIGALRM 14 /* alarm clock */
82 #define SIGTERM 15 /* software termination signal from kill */
83 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
84 #define SIGURG 16 /* urgent condition on IO channel */
86 #if __POSIX_VISIBLE || __XSI_VISIBLE
87 #define SIGSTOP 17 /* sendable stop signal not from tty */
88 #define SIGTSTP 18 /* stop signal from tty */
89 #define SIGCONT 19 /* continue a stopped process */
90 #define SIGCHLD 20 /* to parent on child stop or exit */
91 #define SIGTTIN 21 /* to readers pgrp upon background tty read */
92 #define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */
95 #define SIGIO 23 /* input/output possible signal */
98 #define SIGXCPU 24 /* exceeded CPU time limit */
99 #define SIGXFSZ 25 /* exceeded file size limit */
100 #define SIGVTALRM 26 /* virtual time alarm */
101 #define SIGPROF 27 /* profiling time alarm */
104 #define SIGWINCH 28 /* window size changes */
105 #define SIGINFO 29 /* information request */
107 #if __POSIX_VISIBLE || __XSI_VISIBLE
108 #define SIGUSR1 30 /* user defined signal 1 */
109 #define SIGUSR2 31 /* user defined signal 2 */
112 #define SIGTHR 32 /* reserved by thread library. */
113 #define SIGLWP SIGTHR
114 #define SIGLIBRT 33 /* reserved by real-time library. */
120 #define SIG_DFL ((__sighandler_t *)0)
121 #define SIG_IGN ((__sighandler_t *)1)
122 #define SIG_ERR ((__sighandler_t *)-1)
123 /* #define SIG_CATCH ((__sighandler_t *)2) See signalvar.h */
124 #define SIG_HOLD ((__sighandler_t *)3)
127 * Type of a signal handling function.
129 * Language spec sez signal handlers take exactly one arg, even though we
130 * actually supply three. Ugh!
132 * We don't try to hide the difference by leaving out the args because
133 * that would cause warnings about conformant programs. Nonconformant
134 * programs can avoid the warnings by casting to (__sighandler_t *) or
135 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
137 * The kernel should reverse the cast before calling the function. It
138 * has no way to do this, but on most machines 1-arg and 3-arg functions
139 * have the same calling protocol so there is no problem in practice.
140 * A bit in sa_flags could be used to specify the number of args.
142 typedef void __sighandler_t(int);
144 #if __POSIX_VISIBLE || __XSI_VISIBLE
145 #ifndef _SIGSET_T_DECLARED
146 #define _SIGSET_T_DECLARED
147 typedef __sigset_t sigset_t;
151 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
153 /* Members as suggested by Annex C of POSIX 1003.1b. */
156 /* 6.0 compatibility */
162 #if __POSIX_VISIBLE >= 199309
164 int sigev_notify; /* Notification type */
165 int sigev_signo; /* Signal number */
166 union sigval sigev_value; /* Signal value */
170 void (*_function)(union sigval);
171 void *_attribute; /* pthread_attr_t * */
173 unsigned short _kevent_flags;
179 #define sigev_notify_kqueue sigev_signo
180 #define sigev_notify_kevent_flags _sigev_un._kevent_flags
181 #define sigev_notify_thread_id _sigev_un._threadid
183 #define sigev_notify_function _sigev_un._sigev_thread._function
184 #define sigev_notify_attributes _sigev_un._sigev_thread._attribute
186 #define SIGEV_NONE 0 /* No async notification. */
187 #define SIGEV_SIGNAL 1 /* Generate a queued signal. */
188 #define SIGEV_THREAD 2 /* Call back from another pthread. */
190 #define SIGEV_KEVENT 3 /* Generate a kevent. */
191 #define SIGEV_THREAD_ID 4 /* Send signal to a kernel thread. */
193 #endif /* __POSIX_VISIBLE >= 199309 */
195 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
196 typedef struct __siginfo {
197 int si_signo; /* signal number */
198 int si_errno; /* errno association */
200 * Cause of signal, one of the SI_ macros or signal-specific
201 * values, i.e. one of the FPE_... values for SIGFPE. This
202 * value is equivalent to the second argument to an old-style
203 * FreeBSD signal handler.
205 int si_code; /* signal code */
206 __pid_t si_pid; /* sending process */
207 __uid_t si_uid; /* sender's ruid */
208 int si_status; /* exit value */
209 void *si_addr; /* faulting instruction */
210 union sigval si_value; /* signal value */
213 int _trapno;/* machine specific trap code */
223 long _band; /* band event for SIGPOLL */
224 } _poll; /* was this ever used ? */
232 #define si_trapno _reason._fault._trapno
233 #define si_timerid _reason._timer._timerid
234 #define si_overrun _reason._timer._overrun
235 #define si_mqd _reason._mesgq._mqd
236 #define si_band _reason._poll._band
239 /* codes for SIGILL */
240 #define ILL_ILLOPC 1 /* Illegal opcode. */
241 #define ILL_ILLOPN 2 /* Illegal operand. */
242 #define ILL_ILLADR 3 /* Illegal addressing mode. */
243 #define ILL_ILLTRP 4 /* Illegal trap. */
244 #define ILL_PRVOPC 5 /* Privileged opcode. */
245 #define ILL_PRVREG 6 /* Privileged register. */
246 #define ILL_COPROC 7 /* Coprocessor error. */
247 #define ILL_BADSTK 8 /* Internal stack error. */
249 /* codes for SIGBUS */
250 #define BUS_ADRALN 1 /* Invalid address alignment. */
251 #define BUS_ADRERR 2 /* Nonexistent physical address. */
252 #define BUS_OBJERR 3 /* Object-specific hardware error. */
254 /* codes for SIGSEGV */
255 #define SEGV_MAPERR 1 /* Address not mapped to object. */
256 #define SEGV_ACCERR 2 /* Invalid permissions for mapped */
259 /* codes for SIGFPE */
260 #define FPE_INTOVF 1 /* Integer overflow. */
261 #define FPE_INTDIV 2 /* Integer divide by zero. */
262 #define FPE_FLTDIV 3 /* Floating point divide by zero. */
263 #define FPE_FLTOVF 4 /* Floating point overflow. */
264 #define FPE_FLTUND 5 /* Floating point underflow. */
265 #define FPE_FLTRES 6 /* Floating point inexact result. */
266 #define FPE_FLTINV 7 /* Invalid floating point operation. */
267 #define FPE_FLTSUB 8 /* Subscript out of range. */
269 /* codes for SIGTRAP */
270 #define TRAP_BRKPT 1 /* Process breakpoint. */
271 #define TRAP_TRACE 2 /* Process trace trap. */
272 #define TRAP_DTRACE 3 /* DTrace induced trap. */
274 /* codes for SIGCHLD */
275 #define CLD_EXITED 1 /* Child has exited */
276 #define CLD_KILLED 2 /* Child has terminated abnormally but */
277 /* did not create a core file */
278 #define CLD_DUMPED 3 /* Child has terminated abnormally and */
279 /* created a core file */
280 #define CLD_TRAPPED 4 /* Traced child has trapped */
281 #define CLD_STOPPED 5 /* Child has stopped */
282 #define CLD_CONTINUED 6 /* Stopped child has continued */
284 /* codes for SIGPOLL */
285 #define POLL_IN 1 /* Data input available */
286 #define POLL_OUT 2 /* Output buffers available */
287 #define POLL_MSG 3 /* Input message available */
288 #define POLL_ERR 4 /* I/O Error */
289 #define POLL_PRI 5 /* High priority input available */
290 #define POLL_HUP 6 /* Device disconnected */
294 #if __POSIX_VISIBLE || __XSI_VISIBLE
298 * Signal vector "template" used in sigaction call.
302 void (*__sa_handler)(int);
303 void (*__sa_sigaction)(int, struct __siginfo *, void *);
304 } __sigaction_u; /* signal handler */
305 int sa_flags; /* see signal options below */
306 sigset_t sa_mask; /* signal mask to apply */
309 #define sa_handler __sigaction_u.__sa_handler
313 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
314 #define sa_sigaction __sigaction_u.__sa_sigaction
317 #if __POSIX_VISIBLE || __XSI_VISIBLE
318 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
319 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
322 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
323 #define SA_RESTART 0x0002 /* restart system call on signal return */
324 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
325 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
326 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
327 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
331 #define NSIG 32 /* number of old signals (counting 0) */
334 #if __POSIX_VISIBLE || __XSI_VISIBLE
335 #define SI_NOINFO 0 /* No signal info besides si_signo. */
336 #define SI_USER 0x10001 /* Signal sent by kill(). */
337 #define SI_QUEUE 0x10002 /* Signal sent by the sigqueue(). */
338 #define SI_TIMER 0x10003 /* Signal generated by expiration of */
339 /* a timer set by timer_settime(). */
340 #define SI_ASYNCIO 0x10004 /* Signal generated by completion of */
341 /* an asynchronous I/O request.*/
342 #define SI_MESGQ 0x10005 /* Signal generated by arrival of a */
343 /* message on an empty message queue. */
344 #define SI_KERNEL 0x10006
345 #define SI_LWP 0x10007 /* Signal sent by thr_kill */
348 #define SI_UNDEFINED 0
352 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
353 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
358 * Structure used in sigaltstack call.
361 typedef struct sigaltstack {
365 char *ss_sp; /* signal stack base */
366 __size_t ss_size; /* signal stack length */
367 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
370 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
371 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
372 #define MINSIGSTKSZ __MINSIGSTKSZ /* minimum stack size */
373 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
379 * Signal vector "template" used in sigvec call.
382 __sighandler_t *sv_handler; /* signal handler */
383 int sv_mask; /* signal mask to apply */
384 int sv_flags; /* see signal options below */
387 #define SV_ONSTACK SA_ONSTACK
388 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
389 #define SV_RESETHAND SA_RESETHAND
390 #define SV_NODEFER SA_NODEFER
391 #define SV_NOCLDSTOP SA_NOCLDSTOP
392 #define SV_SIGINFO SA_SIGINFO
393 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
396 /* Keep this in one place only */
397 #if defined(_KERNEL) && defined(COMPAT_43) && \
406 * Structure used in sigstack call.
409 /* XXX ss_sp's type should be `void *'. */
410 char *ss_sp; /* signal stack pointer */
411 int ss_onstack; /* current status */
415 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
417 * Macro for converting signal number to a mask suitable for
420 #define sigmask(m) (1 << ((m)-1))
424 #define BADSIG SIG_ERR
427 #if __POSIX_VISIBLE || __XSI_VISIBLE
429 * Flags for sigprocmask:
431 #define SIG_BLOCK 1 /* block specified signal set */
432 #define SIG_UNBLOCK 2 /* unblock specified signal set */
433 #define SIG_SETMASK 3 /* set specified signal set */
437 * For historical reasons; programs expect signal's return value to be
438 * defined by <sys/signal.h>.
441 __sighandler_t *signal(int, __sighandler_t *);
444 #endif /* !_SYS_SIGNAL_H_ */