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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/signal.h> /* sig_atomic_t; trap codes; sigcontext */
48 * System defined signals.
50 #if __POSIX_VISIBLE || __XSI_VISIBLE
51 #define SIGHUP 1 /* hangup */
53 #define SIGINT 2 /* interrupt */
54 #if __POSIX_VISIBLE || __XSI_VISIBLE
55 #define SIGQUIT 3 /* quit */
57 #define SIGILL 4 /* illegal instr. (not reset when caught) */
59 #define SIGTRAP 5 /* trace trap (not reset when caught) */
61 #define SIGABRT 6 /* abort() */
63 #define SIGIOT SIGABRT /* compatibility */
64 #define SIGEMT 7 /* EMT instruction */
66 #define SIGFPE 8 /* floating point exception */
67 #if __POSIX_VISIBLE || __XSI_VISIBLE
68 #define SIGKILL 9 /* kill (cannot be caught or ignored) */
70 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
71 #define SIGBUS 10 /* bus error */
73 #define SIGSEGV 11 /* segmentation violation */
75 #define SIGSYS 12 /* non-existent system call invoked */
77 #if __POSIX_VISIBLE || __XSI_VISIBLE
78 #define SIGPIPE 13 /* write on a pipe with no one to read it */
79 #define SIGALRM 14 /* alarm clock */
81 #define SIGTERM 15 /* software termination signal from kill */
82 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
83 #define SIGURG 16 /* urgent condition on IO channel */
85 #if __POSIX_VISIBLE || __XSI_VISIBLE
86 #define SIGSTOP 17 /* sendable stop signal not from tty */
87 #define SIGTSTP 18 /* stop signal from tty */
88 #define SIGCONT 19 /* continue a stopped process */
89 #define SIGCHLD 20 /* to parent on child stop or exit */
90 #define SIGTTIN 21 /* to readers pgrp upon background tty read */
91 #define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */
94 #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 */
103 #define SIGWINCH 28 /* window size changes */
104 #define SIGINFO 29 /* information request */
106 #if __POSIX_VISIBLE || __XSI_VISIBLE
107 #define SIGUSR1 30 /* user defined signal 1 */
108 #define SIGUSR2 31 /* user defined signal 2 */
111 #define SIGTHR 32 /* Thread interrupt. */
114 * XXX missing SIGRTMIN, SIGRTMAX.
117 #define SIG_DFL ((__sighandler_t *)0)
118 #define SIG_IGN ((__sighandler_t *)1)
119 #define SIG_ERR ((__sighandler_t *)-1)
121 * XXX missing SIG_HOLD.
125 * Type of a signal handling function.
127 * Language spec sez signal handlers take exactly one arg, even though we
128 * actually supply three. Ugh!
130 * We don't try to hide the difference by leaving out the args because
131 * that would cause warnings about conformant programs. Nonconformant
132 * programs can avoid the warnings by casting to (__sighandler_t *) or
133 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
135 * The kernel should reverse the cast before calling the function. It
136 * has no way to do this, but on most machines 1-arg and 3-arg functions
137 * have the same calling protocol so there is no problem in practice.
138 * A bit in sa_flags could be used to specify the number of args.
140 typedef void __sighandler_t(int);
142 #if __POSIX_VISIBLE || __XSI_VISIBLE
143 #ifndef _SIGSET_T_DECLARED
144 #define _SIGSET_T_DECLARED
145 typedef __sigset_t sigset_t;
149 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE >= 500
151 /* Members as suggested by Annex C of POSIX 1003.1b. */
157 #if __POSIX_VISIBLE >= 199309
159 int sigev_notify; /* Notification type */
161 int __sigev_signo; /* Signal number */
162 int __sigev_notify_kqueue;
164 union sigval sigev_value; /* Signal value */
166 * XXX missing sigev_notify_function, sigev_notify_attributes.
169 #define sigev_signo __sigev_u.__sigev_signo
171 #define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue
174 #define SIGEV_NONE 0 /* No async notification */
175 #define SIGEV_SIGNAL 1 /* Generate a queued signal */
177 #define SIGEV_KEVENT 3 /* Generate a kevent */
180 * XXX missing SIGEV_THREAD.
182 #endif /* __POSIX_VISIBLE >= 199309 */
184 #if __POSIX_VISIBLE >= 199309 || __XSI_VISIBLE
185 typedef struct __siginfo {
186 int si_signo; /* signal number */
187 int si_errno; /* errno association */
189 * Cause of signal, one of the SI_ macros or signal-specific
190 * values, i.e. one of the FPE_... values for SIGFPE. This
191 * value is equivalent to the second argument to an old-style
192 * FreeBSD signal handler.
194 int si_code; /* signal code */
195 __pid_t si_pid; /* sending process */
196 __uid_t si_uid; /* sender's ruid */
197 int si_status; /* exit value */
198 void *si_addr; /* faulting instruction */
199 union sigval si_value; /* signal value */
200 long si_band; /* band event for SIGPOLL */
201 int __spare__[7]; /* gimme some slack */
205 #if __POSIX_VISIBLE || __XSI_VISIBLE
209 * Signal vector "template" used in sigaction call.
213 void (*__sa_handler)(int);
214 void (*__sa_sigaction)(int, struct __siginfo *, void *);
215 } __sigaction_u; /* signal handler */
216 int sa_flags; /* see signal options below */
217 sigset_t sa_mask; /* signal mask to apply */
220 #define sa_handler __sigaction_u.__sa_handler
224 /* If SA_SIGINFO is set, sa_sigaction must be used instead of sa_handler. */
225 #define sa_sigaction __sigaction_u.__sa_sigaction
228 #if __POSIX_VISIBLE || __XSI_VISIBLE
229 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
230 #endif /* __POSIX_VISIBLE || __XSI_VISIBLE */
233 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
234 #define SA_RESTART 0x0002 /* restart system call on signal return */
235 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
236 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
237 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
238 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
242 #define NSIG 32 /* number of old signals (counting 0) */
245 #if __POSIX_VISIBLE || __XSI_VISIBLE
246 #define SI_USER 0x10001
247 #define SI_QUEUE 0x10002
248 #define SI_TIMER 0x10003
249 #define SI_ASYNCIO 0x10004
250 #define SI_MESGQ 0x10005
253 #define SI_UNDEFINED 0
257 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
258 typedef void __siginfohandler_t(int, struct __siginfo *, void *);
263 * Structure used in sigaltstack call.
266 typedef struct sigaltstack {
270 char *ss_sp; /* signal stack base */
271 __size_t ss_size; /* signal stack length */
272 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
275 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
276 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
277 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
283 * Signal vector "template" used in sigvec call.
286 __sighandler_t *sv_handler; /* signal handler */
287 int sv_mask; /* signal mask to apply */
288 int sv_flags; /* see signal options below */
291 #define SV_ONSTACK SA_ONSTACK
292 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
293 #define SV_RESETHAND SA_RESETHAND
294 #define SV_NODEFER SA_NODEFER
295 #define SV_NOCLDSTOP SA_NOCLDSTOP
296 #define SV_SIGINFO SA_SIGINFO
297 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
300 /* Keep this in one place only */
301 #if defined(_KERNEL) && defined(COMPAT_43) && \
302 !defined(__i386__) && !defined(__alpha__)
310 * Structure used in sigstack call.
313 /* XXX ss_sp's type should be `void *'. */
314 char *ss_sp; /* signal stack pointer */
315 int ss_onstack; /* current status */
319 #if __BSD_VISIBLE || __POSIX_VISIBLE > 0 && __POSIX_VISIBLE <= 200112
321 * Macro for converting signal number to a mask suitable for
324 #define sigmask(m) (1 << ((m)-1))
328 #define BADSIG SIG_ERR
331 #if __POSIX_VISIBLE || __XSI_VISIBLE
333 * Flags for sigprocmask:
335 #define SIG_BLOCK 1 /* block specified signal set */
336 #define SIG_UNBLOCK 2 /* unblock specified signal set */
337 #define SIG_SETMASK 3 /* set specified signal set */
341 * For historical reasons; programs expect signal's return value to be
342 * defined by <sys/signal.h>.
345 __sighandler_t *signal(int, __sighandler_t *);
348 #endif /* !_SYS_SIGNAL_H_ */