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38 * @(#)signal.h 8.4 (Berkeley) 5/4/95
42 #ifndef _SYS_SIGNAL_H_
43 #define _SYS_SIGNAL_H_
45 #include <sys/cdefs.h>
46 #include <sys/_posix.h>
52 #define _SIG_MAXSIG 128
53 #define _SIG_IDX(sig) ((sig) - 1)
54 #define _SIG_WORD(sig) (_SIG_IDX(sig) >> 5)
55 #define _SIG_BIT(sig) (1 << (_SIG_IDX(sig) & 31))
58 * System defined signals.
60 #define SIGHUP 1 /* hangup */
61 #define SIGINT 2 /* interrupt */
62 #define SIGQUIT 3 /* quit */
63 #define SIGILL 4 /* illegal instr. (not reset when caught) */
65 #define SIGTRAP 5 /* trace trap (not reset when caught) */
67 #define SIGABRT 6 /* abort() */
69 #define SIGIOT SIGABRT /* compatibility */
70 #define SIGEMT 7 /* EMT instruction */
72 #define SIGFPE 8 /* floating point exception */
73 #define SIGKILL 9 /* kill (cannot be caught or ignored) */
75 #define SIGBUS 10 /* bus error */
77 #define SIGSEGV 11 /* segmentation violation */
79 #define SIGSYS 12 /* non-existent system call invoked */
81 #define SIGPIPE 13 /* write on a pipe with no one to read it */
82 #define SIGALRM 14 /* alarm clock */
83 #define SIGTERM 15 /* software termination signal from kill */
85 #define SIGURG 16 /* urgent condition on IO channel */
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) */
94 #define SIGIO 23 /* input/output possible signal */
95 #define SIGXCPU 24 /* exceeded CPU time limit */
96 #define SIGXFSZ 25 /* exceeded file size limit */
97 #define SIGVTALRM 26 /* virtual time alarm */
98 #define SIGPROF 27 /* profiling time alarm */
99 #define SIGWINCH 28 /* window size changes */
100 #define SIGINFO 29 /* information request */
102 #define SIGUSR1 30 /* user defined signal 1 */
103 #define SIGUSR2 31 /* user defined signal 2 */
106 * Type of a signal handling function.
108 * Language spec sez signal handlers take exactly one arg, even though we
109 * actually supply three. Ugh!
111 * We don't try to hide the difference by leaving out the args because
112 * that would cause warnings about conformant programs. Nonconformant
113 * programs can avoid the warnings by casting to (__sighandler_t *) or
114 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
116 * The kernel should reverse the cast before calling the function. It
117 * has no way to do this, but on most machines 1-arg and 3-arg functions
118 * have the same calling protocol so there is no problem in practice.
119 * A bit in sa_flags could be used to specify the number of args.
121 typedef void __sighandler_t __P((int));
123 #define SIG_DFL ((__sighandler_t *)0)
124 #define SIG_IGN ((__sighandler_t *)1)
125 #define SIG_ERR ((__sighandler_t *)-1)
127 #if defined(_P1003_1B_VISIBLE) || defined(_KERNEL)
129 /* Members as suggested by Annex C of POSIX 1003.1b. */
135 int sigev_notify; /* Notification type */
136 int sigev_signo; /* Signal number */
137 union sigval sigev_value; /* Signal value */
140 #define SIGEV_NONE 0 /* No async notification */
141 #define SIGEV_SIGNAL 1 /* Generate a queued signal */
143 typedef struct __siginfo {
144 int si_signo; /* signal number */
145 int si_errno; /* errno association */
147 * Cause of signal, one of the SI_ macros or signal-specific
148 * values, i.e. one of the FPE_... values for SIGFPE. This
149 * value is equivalent to the second argument to an old-style
150 * FreeBSD signal handler.
152 int si_code; /* signal code */
153 int si_pid; /* sending process */
154 unsigned int si_uid; /* sender's ruid */
155 int si_status; /* exit value */
156 void *si_addr; /* faulting instruction */
157 union sigval si_value; /* signal value */
158 long si_band; /* band event for SIGPOLL */
159 int __spare__[7]; /* gimme some slack */
161 #endif /* _P1003_1B_VISIBLE */
163 typedef struct __sigset {
164 unsigned int __bits[_SIG_WORDS];
168 * XXX - there are some nasty dependencies on include file order. Now that
169 * sigset_t has been defined we can include the MD header.
171 #include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */
173 #if !defined(_ANSI_SOURCE)
178 * Signal vector "template" used in sigaction call.
182 void (*__sa_handler) __P((int));
183 void (*__sa_sigaction) __P((int, struct __siginfo *,
185 } __sigaction_u; /* signal handler */
186 int sa_flags; /* see signal options below */
187 sigset_t sa_mask; /* signal mask to apply */
190 /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
191 #define sa_handler __sigaction_u.__sa_handler
193 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
195 #if !defined(_POSIX_SOURCE)
197 #define sa_sigaction __sigaction_u.__sa_sigaction
199 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
200 #define SA_RESTART 0x0002 /* restart system call on signal return */
201 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
202 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
203 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
204 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
206 #define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */
209 #define NSIG 32 /* number of old signals (counting 0) */
211 /* POSIX 1003.1b required values. */
212 #define SI_USER 0x10001
213 #define SI_QUEUE 0x10002
214 #define SI_TIMER 0x10003
215 #define SI_ASYNCIO 0x10004
216 #define SI_MESGQ 0x10005
218 /* Additional FreeBSD values. */
219 #define SI_UNDEFINED 0
221 typedef void __siginfohandler_t __P((int, struct __siginfo *, void *));
223 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
226 typedef _BSD_SIZE_T_ size_t;
231 * Structure used in sigaltstack call.
233 typedef struct sigaltstack {
234 char *ss_sp; /* signal stack base */
235 size_t ss_size; /* signal stack length */
236 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
239 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
240 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
241 #define MINSIGSTKSZ 8192 /* minimum allowable stack */
242 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
244 /* Have enough typedefs for this now. XXX */
245 #include <sys/ucontext.h>
249 * Signal vector "template" used in sigvec call.
252 __sighandler_t *sv_handler; /* signal handler */
253 int sv_mask; /* signal mask to apply */
254 int sv_flags; /* see signal options below */
257 #define SV_ONSTACK SA_ONSTACK
258 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
259 #define SV_RESETHAND SA_RESETHAND
260 #define SV_NODEFER SA_NODEFER
261 #define SV_NOCLDSTOP SA_NOCLDSTOP
262 #define SV_SIGINFO SA_SIGINFO
263 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
266 * Structure used in sigstack call.
269 char *ss_sp; /* signal stack pointer */
270 int ss_onstack; /* current status */
274 * Macro for converting signal number to a mask suitable for
277 #define sigmask(m) (1 << ((m)-1))
279 #define BADSIG SIG_ERR
281 #endif /* !_POSIX_SOURCE */
284 * Flags for sigprocmask:
286 #define SIG_BLOCK 1 /* block specified signal set */
287 #define SIG_UNBLOCK 2 /* unblock specified signal set */
288 #define SIG_SETMASK 3 /* set specified signal set */
290 #endif /* !_ANSI_SOURCE */
293 * For historical reasons; programs expect signal's return value to be
294 * defined by <sys/signal.h>.
297 __sighandler_t *signal __P((int, __sighandler_t *));
300 #endif /* !_SYS_SIGNAL_H_ */