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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 */
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 /* Thread interrupt. */
115 * XXX missing SIGRTMIN, SIGRTMAX.
118 #define SIG_DFL ((__sighandler_t *)0)
119 #define SIG_IGN ((__sighandler_t *)1)
120 #define SIG_ERR ((__sighandler_t *)-1)
122 * XXX missing SIG_HOLD.
126 * Type of a signal handling function.
128 * Language spec sez signal handlers take exactly one arg, even though we
129 * actually supply three. Ugh!
131 * We don't try to hide the difference by leaving out the args because
132 * that would cause warnings about conformant programs. Nonconformant
133 * programs can avoid the warnings by casting to (__sighandler_t *) or
134 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
136 * The kernel should reverse the cast before calling the function. It
137 * has no way to do this, but on most machines 1-arg and 3-arg functions
138 * have the same calling protocol so there is no problem in practice.
139 * A bit in sa_flags could be used to specify the number of args.
141 typedef void __sighandler_t(int);
143 #if __POSIX_VISIBLE || __XSI_VISIBLE
144 #ifndef _SIGSET_T_DECLARED
145 #define _SIGSET_T_DECLARED
146 typedef __sigset_t sigset_t;
150 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
152 /* Members as suggested by Annex C of POSIX 1003.1b. */
158 #if __POSIX_VISIBLE >= 199309
160 int sigev_notify; /* Notification type */
162 int __sigev_signo; /* Signal number */
163 int __sigev_notify_kqueue;
165 union sigval sigev_value; /* Signal value */
167 * XXX missing sigev_notify_function, sigev_notify_attributes.
170 #define sigev_signo __sigev_u.__sigev_signo
172 #define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue
175 #define SIGEV_NONE 0 /* No async notification */
176 #define SIGEV_SIGNAL 1 /* Generate a queued signal */
178 #define SIGEV_KEVENT 3 /* Generate a kevent */
181 * XXX missing SIGEV_THREAD.
183 #endif /* __POSIX_VISIBLE >= 199309 */
185 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
186 typedef struct __siginfo {
187 int si_signo; /* signal number */
188 int si_errno; /* errno association */
190 * Cause of signal, one of the SI_ macros or signal-specific
191 * values, i.e. one of the FPE_... values for SIGFPE. This
192 * value is equivalent to the second argument to an old-style
193 * FreeBSD signal handler.
195 int si_code; /* signal code */
196 __pid_t si_pid; /* sending process */
197 __uid_t si_uid; /* sender's ruid */
198 int si_status; /* exit value */
199 void *si_addr; /* faulting instruction */
200 union sigval si_value; /* signal value */
201 long si_band; /* band event for SIGPOLL */
202 int __spare__[7]; /* gimme some slack */
206 #if __POSIX_VISIBLE || __XSI_VISIBLE
210 * Signal vector "template" used in sigaction call.
214 void (*__sa_handler)(int);
215 void (*__sa_sigaction)(int, struct __siginfo *, void *);
216 } __sigaction_u; /* signal handler */
217 int sa_flags; /* see signal options below */
218 sigset_t sa_mask; /* signal mask to apply */
221 #define sa_handler __sigaction_u.__sa_handler
225 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
226 #define sa_sigaction __sigaction_u.__sa_sigaction
229 #if __POSIX_VISIBLE || __XSI_VISIBLE
230 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
231 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
234 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
235 #define SA_RESTART 0x0002 /* restart system call on signal return */
236 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
237 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
238 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
239 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
243 #define NSIG 32 /* number of old signals (counting 0) */
246 #if __POSIX_VISIBLE || __XSI_VISIBLE
247 #define SI_USER 0x10001
248 #define SI_QUEUE 0x10002
249 #define SI_TIMER 0x10003
250 #define SI_ASYNCIO 0x10004
251 #define SI_MESGQ 0x10005
254 #define SI_UNDEFINED 0
258 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
259 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
264 * Structure used in sigaltstack call.
267 typedef struct sigaltstack {
271 char *ss_sp; /* signal stack base */
272 __size_t ss_size; /* signal stack length */
273 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
276 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
277 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
278 #define MINSIGSTKSZ __MINSIGSTKSZ /* minimum stack size */
279 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
285 * Signal vector "template" used in sigvec call.
288 __sighandler_t *sv_handler; /* signal handler */
289 int sv_mask; /* signal mask to apply */
290 int sv_flags; /* see signal options below */
293 #define SV_ONSTACK SA_ONSTACK
294 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
295 #define SV_RESETHAND SA_RESETHAND
296 #define SV_NODEFER SA_NODEFER
297 #define SV_NOCLDSTOP SA_NOCLDSTOP
298 #define SV_SIGINFO SA_SIGINFO
299 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
302 /* Keep this in one place only */
303 #if defined(_KERNEL) && defined(COMPAT_43) && \
304 !defined(__i386__) && !defined(__alpha__)
312 * Structure used in sigstack call.
315 /* XXX ss_sp's type should be `void *'. */
316 char *ss_sp; /* signal stack pointer */
317 int ss_onstack; /* current status */
321 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
323 * Macro for converting signal number to a mask suitable for
326 #define sigmask(m) (1 << ((m)-1))
330 #define BADSIG SIG_ERR
333 #if __POSIX_VISIBLE || __XSI_VISIBLE
335 * Flags for sigprocmask:
337 #define SIG_BLOCK 1 /* block specified signal set */
338 #define SIG_UNBLOCK 2 /* unblock specified signal set */
339 #define SIG_SETMASK 3 /* set specified signal set */
343 * For historical reasons; programs expect signal's return value to be
344 * defined by <sys/signal.h>.
347 __sighandler_t *signal(int, __sighandler_t *);
350 #endif /* !_SYS_SIGNAL_H_ */