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35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)signal.h 8.4 (Berkeley) 5/4/95
39 * $FreeBSD: src/sys/sys/signal.h,v 1.23.2.2 2001/04/19 01:38:35 alfred Exp $
42 #ifndef _SYS_SIGNAL_H_
43 #define _SYS_SIGNAL_H_
45 #include <machine/stdint.h> /* for __ types */
46 #include <sys/cdefs.h>
47 #include <sys/_posix.h>
53 #define _SIG_MAXSIG 128
54 #define _SIG_IDX(sig) ((sig) - 1)
55 #define _SIG_WORD(sig) (_SIG_IDX(sig) >> 5)
56 #define _SIG_BIT(sig) (1 << (_SIG_IDX(sig) & 31))
57 #define _SIG_VALID(sig) ((sig) < _SIG_MAXSIG && (sig) > 0)
60 * System defined signals.
62 #define SIGHUP 1 /* hangup */
63 #define SIGINT 2 /* interrupt */
64 #define SIGQUIT 3 /* quit */
65 #define SIGILL 4 /* illegal instr. (not reset when caught) */
67 #define SIGTRAP 5 /* trace trap (not reset when caught) */
69 #define SIGABRT 6 /* abort() */
71 #define SIGIOT SIGABRT /* compatibility */
72 #define SIGEMT 7 /* EMT instruction */
74 #define SIGFPE 8 /* floating point exception */
75 #define SIGKILL 9 /* kill (cannot be caught or ignored) */
77 #define SIGBUS 10 /* bus error */
79 #define SIGSEGV 11 /* segmentation violation */
81 #define SIGSYS 12 /* non-existent system call invoked */
83 #define SIGPIPE 13 /* write on a pipe with no one to read it */
84 #define SIGALRM 14 /* alarm clock */
85 #define SIGTERM 15 /* software termination signal from kill */
87 #define SIGURG 16 /* urgent condition on IO channel */
89 #define SIGSTOP 17 /* sendable stop signal not from tty */
90 #define SIGTSTP 18 /* stop signal from tty */
91 #define SIGCONT 19 /* continue a stopped process */
92 #define SIGCHLD 20 /* to parent on child stop or exit */
93 #define SIGTTIN 21 /* to readers pgrp upon background tty read */
94 #define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */
96 #define SIGIO 23 /* input/output possible signal */
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 #define SIGWINCH 28 /* window size changes */
102 #define SIGINFO 29 /* information request */
104 #define SIGUSR1 30 /* user defined signal 1 */
105 #define SIGUSR2 31 /* user defined signal 2 */
107 #define SIGTHR 32 /* Thread interrupt (FreeBSD-5 reserved) */
108 #define SIGCKPT 33 /* checkpoint and continue */
109 #define SIGCKPTEXIT 34 /* checkpoint and exit */
116 #define ILL_ILLOPC 1 /* Illegal opcode */
117 #define ILL_ILLOPN 2 /* Illegal operand */
118 #define ILL_ILLADR 3 /* Illegal addressing mode */
119 #define ILL_ILLTRP 4 /* Illegal trap */
120 #define ILL_PRVOPC 5 /* Privileged opcode */
121 #define ILL_PRVREG 6 /* Privileged register */
122 #define ILL_COPROC 7 /* Coprocessor error */
123 #define ILL_BADSTK 8 /* Internal stack error */
126 #define FPE_INTOVF 1 /* Integer overflow */
127 #define FPE_INTDIV 2 /* Integer divide by zero */
128 #define FPE_FLTDIV 3 /* Floating point divide by zero */
129 #define FPE_FLTOVF 4 /* Floating point overflow */
130 #define FPE_FLTUND 5 /* Floating point underflow */
131 #define FPE_FLTRES 6 /* Floating point inexact result */
132 #define FPE_FLTINV 7 /* Invalid Floating point operation */
133 #define FPE_FLTSUB 8 /* Subscript out of range */
136 #define SEGV_MAPERR 1 /* Address not mapped to object */
137 #define SEGV_ACCERR 2 /* Invalid permissions for mapped object*/
140 #define BUS_ADRALN 1 /* Invalid address alignment */
141 #define BUS_ADRERR 2 /* Non-existent physical address */
142 #define BUS_OBJERR 3 /* Object specific hardware error */
145 #define TRAP_BRKPT 1 /* Process breakpoint */
146 #define TRAP_TRACE 2 /* Process trace trap */
149 #define CLD_EXITED 1 /* Child has exited */
150 #define CLD_KILLED 2 /* Child has terminated abnormally but */
151 /* did not create a core file */
152 #define CLD_DUMPED 3 /* Child has terminated abnormally and */
153 /* created a core file */
154 #define CLD_TRAPPED 4 /* Traced child has trapped */
155 #define CLD_STOPPED 5 /* Child has stopped */
156 #define CLD_CONTINUED 6 /* Stopped child has continued */
159 #define POLL_IN 1 /* Data input available */
160 #define POLL_OUT 2 /* Output buffers available */
161 #define POLL_MSG 3 /* Input message available */
162 #define POLL_ERR 4 /* I/O Error */
163 #define POLL_PRI 5 /* High priority input available */
164 #define POLL_HUP 6 /* Device disconnected */
168 #define SI_USER 0 /* Sent by kill(2) */
169 #define SI_QUEUE -1 /* Sent by the sigqueue(2) */
170 #define SI_TIMER -2 /* Generated by expiration of a timer */
171 /* set by timer_settime(2) */
172 #define SI_ASYNCIO -3 /* Generated by completion of an */
173 /* asynchronous I/O signal */
174 #define SI_MESGQ -4 /* Generated by arrival of a message on */
175 /* an empty message queue */
178 * Type of a signal handling function.
180 * Language spec sez signal handlers take exactly one arg, even though we
181 * actually supply three. Ugh!
183 * We don't try to hide the difference by leaving out the args because
184 * that would cause warnings about conformant programs. Nonconformant
185 * programs can avoid the warnings by casting to (__sighandler_t *) or
186 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
188 * The kernel should reverse the cast before calling the function. It
189 * has no way to do this, but on most machines 1-arg and 3-arg functions
190 * have the same calling protocol so there is no problem in practice.
191 * A bit in sa_flags could be used to specify the number of args.
193 * SIG_EINTR causes system calls to interrupt but generates no signal
194 * delivery. The caller is responsible for polling the event.
196 typedef void __sighandler_t (int);
198 #define SIG_DFL ((__sighandler_t *)0)
199 #define SIG_IGN ((__sighandler_t *)1)
200 #define SIG_ERR ((__sighandler_t *)-1)
202 #if defined(_P1003_1B_VISIBLE) || defined(_KERNEL)
204 /* Members as suggested by SuSv2 and IEEE Std 1003.1 */
207 /* Leave old members for backward compatibility */
214 int sigev_notify; /* Notification type */
216 int __sigev_signo; /* Signal number */
217 int __sigev_notify_kqueue;
218 void *__sigev_notify_attributes;
220 union sigval sigev_value; /* Signal value */
221 void (*sigev_notify_function)(union sigval);
223 #define sigev_signo __sigev_u.__sigev_signo
224 #define sigev_notify_attributes __sigev_u.__sigev_notify_attributes
225 #define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue
227 #define SIGEV_NONE 0 /* No async notification */
228 #define SIGEV_SIGNAL 1 /* Generate a queued signal */
229 #define SIGEV_THREAD 2 /* Call back in a pthread */
230 #define SIGEV_KEVENT 3 /* Generate a kevent */
232 typedef struct __siginfo {
233 int si_signo; /* signal number */
234 int si_errno; /* errno association */
236 * Cause of signal, one of the SI_ macros or signal-specific
237 * values, i.e. one of the FPE_... values for SIGFPE. This
238 * value is equivalent to the second argument to an old-style
239 * FreeBSD signal handler.
241 int si_code; /* signal code */
242 int si_pid; /* sending process */
243 unsigned int si_uid; /* sender's ruid */
244 int si_status; /* exit value */
245 void *si_addr; /* faulting instruction */
246 union sigval si_value; /* signal value */
247 long si_band; /* band event for SIGPOLL */
248 int __spare__[7]; /* gimme some slack */
250 #endif /* _P1003_1B_VISIBLE */
252 typedef struct __sigset {
253 unsigned int __bits[_SIG_WORDS];
257 * XXX - there are some nasty dependencies on include file order. Now that
258 * sigset_t has been defined we can include the MD header.
260 #include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */
262 #if !defined(_ANSI_SOURCE)
267 * Signal vector "template" used in sigaction call.
271 void (*__sa_handler) (int);
272 void (*__sa_sigaction) (int, struct __siginfo *, void *);
273 } __sigaction_u; /* signal handler */
274 int sa_flags; /* see signal options below */
275 sigset_t sa_mask; /* signal mask to apply */
278 /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
279 #define sa_handler __sigaction_u.__sa_handler
281 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
283 #if !defined(_POSIX_SOURCE)
285 #define sa_sigaction __sigaction_u.__sa_sigaction
287 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
288 #define SA_RESTART 0x0002 /* restart system call on signal return */
289 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
290 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
291 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
292 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
294 #define NSIG 64 /* size of sigptbl */
296 /* Additional FreeBSD values. */
297 #define SI_UNDEFINED 0
299 typedef void __siginfohandler_t (int, struct __siginfo *, void *);
301 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
304 * Structure used in sigaltstack call.
306 typedef struct sigaltstack {
307 char *ss_sp; /* signal stack base */
308 __size_t ss_size; /* signal stack length */
309 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
312 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
313 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
314 #define MINSIGSTKSZ 8192 /* minimum allowable stack */
315 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
317 /* Have enough typedefs for this now. XXX */
318 #include <sys/ucontext.h>
322 * Signal vector "template" used in sigvec call.
325 __sighandler_t *sv_handler; /* signal handler */
326 int sv_mask; /* signal mask to apply */
327 int sv_flags; /* see signal options below */
330 #define SV_ONSTACK SA_ONSTACK
331 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
332 #define SV_RESETHAND SA_RESETHAND
333 #define SV_NODEFER SA_NODEFER
334 #define SV_NOCLDSTOP SA_NOCLDSTOP
335 #define SV_SIGINFO SA_SIGINFO
336 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
339 * Structure used in sigstack call.
342 char *ss_sp; /* signal stack pointer */
343 int ss_onstack; /* current status */
347 * Macro for converting signal number to a mask suitable for
350 #define sigmask(m) (1 << ((m)-1))
352 #define BADSIG SIG_ERR
354 #endif /* !_POSIX_SOURCE */
357 * Flags for sigprocmask:
359 #define SIG_BLOCK 1 /* block specified signal set */
360 #define SIG_UNBLOCK 2 /* unblock specified signal set */
361 #define SIG_SETMASK 3 /* set specified signal set */
363 #endif /* !_ANSI_SOURCE */
366 * For historical reasons; programs expect signal's return value to be
367 * defined by <sys/signal.h>.
370 __sighandler_t *signal (int, __sighandler_t *);
373 #endif /* !_SYS_SIGNAL_H_ */