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38 * @(#)signal.h 8.4 (Berkeley) 5/4/95
39 * $Id: signal.h,v 1.13 1998/03/28 11:50:43 dufault Exp $
42 #ifndef _SYS_SIGNAL_H_
43 #define _SYS_SIGNAL_H_
45 #include <sys/cdefs.h>
46 #include <sys/_posix.h>
47 #include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */
49 #if !defined(_ANSI_SOURCE) && !defined(_POSIX_SOURCE)
50 #define NSIG 32 /* counting 0; could be 33 (mask is 1-32) */
53 #define SIGHUP 1 /* hangup */
54 #define SIGINT 2 /* interrupt */
55 #define SIGQUIT 3 /* quit */
56 #define SIGILL 4 /* illegal instruction (not reset when caught) */
58 #define SIGTRAP 5 /* trace trap (not reset when caught) */
60 #define SIGABRT 6 /* abort() */
62 #define SIGIOT SIGABRT /* compatibility */
63 #define SIGEMT 7 /* EMT instruction */
65 #define SIGFPE 8 /* floating point exception */
66 #define SIGKILL 9 /* kill (cannot be caught or ignored) */
68 #define SIGBUS 10 /* bus error */
70 #define SIGSEGV 11 /* segmentation violation */
72 #define SIGSYS 12 /* non-existent system call invoked */
74 #define SIGPIPE 13 /* write on a pipe with no one to read it */
75 #define SIGALRM 14 /* alarm clock */
76 #define SIGTERM 15 /* software termination signal from kill */
78 #define SIGURG 16 /* urgent condition on IO channel */
80 #define SIGSTOP 17 /* sendable stop signal not from tty */
81 #define SIGTSTP 18 /* stop signal from tty */
82 #define SIGCONT 19 /* continue a stopped process */
83 #define SIGCHLD 20 /* to parent on child stop or exit */
84 #define SIGTTIN 21 /* to readers pgrp upon background tty read */
85 #define SIGTTOU 22 /* like TTIN for output if (tp->t_local<OSTOP) */
87 #define SIGIO 23 /* input/output possible signal */
88 #define SIGXCPU 24 /* exceeded CPU time limit */
89 #define SIGXFSZ 25 /* exceeded file size limit */
90 #define SIGVTALRM 26 /* virtual time alarm */
91 #define SIGPROF 27 /* profiling time alarm */
92 #define SIGWINCH 28 /* window size changes */
93 #define SIGINFO 29 /* information request */
95 #define SIGUSR1 30 /* user defined signal 1 */
96 #define SIGUSR2 31 /* user defined signal 2 */
99 * Type of a signal handling function.
101 * Language spec sez signal handlers take exactly one arg, even though we
102 * actually supply three. Ugh!
104 * We don't try to hide the difference by leaving out the args because
105 * that would cause warnings about conformant programs. Nonconformant
106 * programs can avoid the warnings by casting to (__sighandler_t *) or
107 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
109 * The kernel should reverse the cast before calling the function. It
110 * has no way to do this, but on most machines 1-arg and 3-arg functions
111 * have the same calling protocol so there is no problem in practice.
112 * A bit in sa_flags could be used to specify the number of args.
114 typedef void __sighandler_t __P((int));
116 #define SIG_DFL ((__sighandler_t *)0)
117 #define SIG_IGN ((__sighandler_t *)1)
118 #define SIG_ERR ((__sighandler_t *)-1)
121 typedef unsigned int sigset_t;
124 * Signal vector "template" used in sigaction call.
127 __sighandler_t *sa_handler; /* signal handler */
128 sigset_t sa_mask; /* signal mask to apply */
129 int sa_flags; /* see signal options below */
131 #ifndef _POSIX_SOURCE
132 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
133 #define SA_RESTART 0x0002 /* restart system call on signal return */
134 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
135 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
136 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
138 #define SA_USERTRAMP 0x0100 /* do not bounce off kernel's sigtramp */
140 #endif /* _POSIX_SOURCE */
141 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
144 * Flags for sigprocmask:
146 #define SIG_BLOCK 1 /* block specified signal set */
147 #define SIG_UNBLOCK 2 /* unblock specified signal set */
148 #define SIG_SETMASK 3 /* set specified signal set */
150 #ifndef _POSIX_SOURCE
151 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
154 typedef _BSD_SIZE_T_ size_t;
159 * Structure used in sigaltstack call.
162 char *ss_sp; /* signal stack base */
163 size_t ss_size; /* signal stack length */
164 int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
166 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
167 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
168 #define MINSIGSTKSZ 8192 /* minimum allowable stack */
169 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
173 * Signal vector "template" used in sigvec call.
176 __sighandler_t *sv_handler; /* signal handler */
177 int sv_mask; /* signal mask to apply */
178 int sv_flags; /* see signal options below */
181 #define SV_ONSTACK SA_ONSTACK
182 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
183 #define SV_RESETHAND SA_RESETHAND
184 #define SV_NODEFER SA_NODEFER
185 #define SV_NOCLDSTOP SA_NOCLDSTOP
186 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
189 * Structure used in sigstack call.
192 char *ss_sp; /* signal stack pointer */
193 int ss_onstack; /* current status */
197 * Macro for converting signal number to a mask suitable for
200 #define sigmask(m) (1 << ((m)-1))
202 #define BADSIG SIG_ERR
204 #endif /* !_POSIX_SOURCE */
205 #endif /* !_ANSI_SOURCE */
207 #ifdef _P1003_1B_VISIBLE_HISTORICALLY
209 /* sys/aio.h unconditionally defined these */
212 int sival_int; /* Integer signal value */
213 void *sival_ptr; /* Pointer signal value */
216 typedef struct siginfo {
217 int si_signo; /* Signal number */
218 int si_code; /* Cause of the signal */
219 union sigval si_value; /* Signal value */
223 int sigev_notify; /* Notification type */
224 int sigev_signo; /* Signal number */
225 union sigval sigev_value; /* Signal value */
228 #define SIGEV_NONE 0 /* No async notification */
229 #define SIGEV_SIGNAL 1 /* Generate a queued signal */
234 * For historical reasons; programs expect signal's return value to be
235 * defined by <sys/signal.h>.
238 __sighandler_t *signal __P((int, __sighandler_t *));
241 #endif /* !_SYS_SIGNAL_H_ */