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34 * @(#)signal.h 8.4 (Berkeley) 5/4/95
35 * $FreeBSD: src/sys/sys/signal.h,v 1.23.2.2 2001/04/19 01:38:35 alfred Exp $
38 #ifndef _SYS_SIGNAL_H_
39 #define _SYS_SIGNAL_H_
41 #include <sys/cdefs.h>
42 #include <sys/_siginfo.h>
43 #include <sys/_sigset.h>
44 #include <machine/stdint.h>
46 #ifndef _PID_T_DECLARED
47 typedef __pid_t pid_t;
48 #define _PID_T_DECLARED
51 #ifndef _SIZE_T_DECLARED
52 typedef __size_t size_t;
53 #define _SIZE_T_DECLARED
56 #ifndef _UID_T_DECLARED
57 typedef __uint32_t uid_t;
58 #define _UID_T_DECLARED
64 #define _SIG_MAXSIG 128
65 #define _SIG_IDX(sig) ((sig) - 1)
66 #define _SIG_WORD(sig) (_SIG_IDX(sig) >> 5)
67 #define _SIG_BIT(sig) (1 << (_SIG_IDX(sig) & 31))
68 #define _SIG_VALID(sig) ((sig) < _SIG_MAXSIG && (sig) > 0)
71 * System defined signals.
74 #define SIGHUP 1 /* hangup */
76 #define SIGINT 2 /* interrupt */
78 #define SIGQUIT 3 /* quit */
80 #define SIGILL 4 /* illegal instr. (not reset when caught) */
82 #define SIGTRAP 5 /* trace trap (not reset when caught) */
84 #define SIGABRT 6 /* abort() */
86 #define SIGIOT SIGABRT /* compatibility */
87 #define SIGEMT 7 /* EMT instruction */
89 #define SIGFPE 8 /* floating point exception */
91 #define SIGKILL 9 /* kill (cannot be caught or ignored) */
93 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
94 #define SIGBUS 10 /* bus error */
96 #define SIGSEGV 11 /* segmentation violation */
97 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
98 #define SIGSYS 12 /* non-existent system call invoked */
101 #define SIGPIPE 13 /* write on a pipe with no one to read it */
102 #define SIGALRM 14 /* alarm clock */
104 #define SIGTERM 15 /* software termination signal from kill */
105 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
106 #define SIGURG 16 /* urgent condition on IO channel */
109 #define SIGSTOP 17 /* sendable stop signal not from tty */
110 #define SIGTSTP 18 /* stop signal from tty */
111 #define SIGCONT 19 /* continue a stopped process */
112 #define SIGCHLD 20 /* to parent on child stop or exit */
113 #define SIGTTIN 21 /* to readers pgrp upon background tty read */
114 #define SIGTTOU 22 /* like TTIN if (tp->t_local<OSTOP) */
117 #define SIGIO 23 /* input/output possible signal */
120 #define SIGXCPU 24 /* exceeded CPU time limit */
121 #define SIGXFSZ 25 /* exceeded file size limit */
122 #define SIGVTALRM 26 /* virtual time alarm */
123 #define SIGPROF 27 /* profiling time alarm */
126 #define SIGWINCH 28 /* window size changes */
127 #define SIGINFO 29 /* information request */
130 #define SIGUSR1 30 /* user defined signal 1 */
131 #define SIGUSR2 31 /* user defined signal 2 */
134 #define SIGTHR 32 /* Thread interrupt (FreeBSD-5 reserved) */
135 #define SIGCKPT 33 /* checkpoint and continue */
136 #define SIGCKPTEXIT 34 /* checkpoint and exit */
140 * Type of a signal handling function.
142 * Language spec sez signal handlers take exactly one arg, even though we
143 * actually supply three. Ugh!
145 * We don't try to hide the difference by leaving out the args because
146 * that would cause warnings about conformant programs. Nonconformant
147 * programs can avoid the warnings by casting to (__sighandler_t *) or
148 * sig_t before calling signal() or assigning to sa_handler or sv_handler.
150 * The kernel should reverse the cast before calling the function. It
151 * has no way to do this, but on most machines 1-arg and 3-arg functions
152 * have the same calling protocol so there is no problem in practice.
153 * A bit in sa_flags could be used to specify the number of args.
155 * SIG_EINTR causes system calls to interrupt but generates no signal
156 * delivery. The caller is responsible for polling the event.
158 typedef void __sighandler_t (int);
160 #define SIG_DFL ((__sighandler_t *)0)
161 #define SIG_IGN ((__sighandler_t *)1)
162 #define SIG_ERR ((__sighandler_t *)-1)
164 #if __POSIX_VISIBLE >= 199309
165 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
166 #ifndef _PTHREAD_ATTR_T_DECLARED
167 struct __pthread_attr_s;
168 typedef struct __pthread_attr_s *pthread_attr_t;
169 #define _PTHREAD_ATTR_T_DECLARED
174 int sigev_notify; /* Notification type */
176 int __sigev_signo; /* Signal number */
177 int __sigev_notify_kqueue;
179 void *__sigev_notify_attributes;
181 pthread_attr_t *__sigev_notify_attributes;
184 union sigval sigev_value; /* Signal value */
185 void (*sigev_notify_function)(union sigval);
187 #define sigev_signo __sigev_u.__sigev_signo
188 #define sigev_notify_attributes __sigev_u.__sigev_notify_attributes
190 #define sigev_notify_kqueue __sigev_u.__sigev_notify_kqueue
193 #define SIGEV_NONE 0 /* No async notification */
194 #define SIGEV_SIGNAL 1 /* Generate a queued signal */
195 #define SIGEV_THREAD 2 /* Call back in a pthread */
197 #define SIGEV_KEVENT 3 /* Generate a kevent */
199 #endif /* __POSIX_VISIBLE >= 199309 */
201 #ifndef _SIGSET_T_DECLARED
202 typedef struct __sigset sigset_t;
203 #define _SIGSET_T_DECLARED
207 * XXX - there are some nasty dependencies on include file order. Now that
208 * sigset_t has been defined we can include the MD header.
210 #include <machine/signal.h> /* sig_atomic_t; trap codes; sigcontext */
216 * Signal vector "template" used in sigaction call.
220 void (*__sa_handler) (int);
221 void (*__sa_sigaction) (int, struct __siginfo *, void *);
222 } __sigaction_u; /* signal handler */
223 int sa_flags; /* see signal options below */
224 sigset_t sa_mask; /* signal mask to apply */
227 /* if SA_SIGINFO is set, sa_sigaction is to be used instead of sa_handler. */
228 #define sa_handler __sigaction_u.__sa_handler
230 #define SA_NOCLDSTOP 0x0008 /* do not generate SIGCHLD on child stop */
231 #endif /* __POSIX_VISIBLE */
234 #define sa_sigaction __sigaction_u.__sa_sigaction
238 #define SA_ONSTACK 0x0001 /* take signal on signal stack */
239 #define SA_RESTART 0x0002 /* restart system call on signal return */
240 #define SA_RESETHAND 0x0004 /* reset to SIG_DFL when taking signal */
241 #define SA_NODEFER 0x0010 /* don't mask the signal we're delivering */
242 #define SA_NOCLDWAIT 0x0020 /* don't keep zombies around */
243 #define SA_SIGINFO 0x0040 /* signal handler with SA_SIGINFO args */
247 #define NSIG 64 /* size of sigptbl */
249 /* Additional FreeBSD values. */
250 #define SI_UNDEFINED 0
252 typedef void __siginfohandler_t (int, siginfo_t *, void *);
254 typedef __sighandler_t *sig_t; /* type of pointer to a signal function */
257 #define SS_ONSTACK 0x0001 /* take signal on alternate stack */
258 #define SS_DISABLE 0x0004 /* disable taking signals on alternate stack */
259 #define MINSIGSTKSZ 8192 /* minimum allowable stack */
260 #define SIGSTKSZ (MINSIGSTKSZ + 32768) /* recommended stack size */
263 #include <sys/ucontext.h>
264 #elif __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
265 #include <sys/_ucontext.h>
271 * Signal vector "template" used in sigvec call.
274 __sighandler_t *sv_handler; /* signal handler */
275 int sv_mask; /* signal mask to apply */
276 int sv_flags; /* see signal options below */
279 #define SV_ONSTACK SA_ONSTACK
280 #define SV_INTERRUPT SA_RESTART /* same bit, opposite sense */
281 #define SV_RESETHAND SA_RESETHAND
282 #define SV_NODEFER SA_NODEFER
283 #define SV_NOCLDSTOP SA_NOCLDSTOP
284 #define SV_SIGINFO SA_SIGINFO
285 #define sv_onstack sv_flags /* isn't compatibility wonderful! */
288 * Macro for converting signal number to a mask suitable for
291 #define sigmask(m) (1 << ((m)-1))
293 #define BADSIG SIG_ERR
294 #endif /* __BSD_VISIBLE */
298 * Flags for sigprocmask:
300 #define SIG_BLOCK 1 /* block specified signal set */
301 #define SIG_UNBLOCK 2 /* unblock specified signal set */
302 #define SIG_SETMASK 3 /* set specified signal set */
306 * For historical reasons; programs expect signal's return value to be
307 * defined by <sys/signal.h>.
310 __sighandler_t *signal(int, __sighandler_t *);
312 int sigblockall(void);
313 int sigunblockall(void);
317 #endif /* !_SYS_SIGNAL_H_ */