2 * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/sys/event.h,v 1.5.2.6 2003/02/09 15:28:13 nectar Exp $
27 * $DragonFly: src/sys/sys/event.h,v 1.7 2007/01/15 01:26:56 dillon Exp $
34 #include <sys/types.h>
36 #ifndef _NET_NETISR_H_
37 #include <net/netisr.h> /* struct notifymsglist */
39 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
40 #include <sys/queue.h>
43 #define EVFILT_READ (-1)
44 #define EVFILT_WRITE (-2)
45 #define EVFILT_AIO (-3) /* attached to aio requests */
46 #define EVFILT_VNODE (-4) /* attached to vnodes */
47 #define EVFILT_PROC (-5) /* attached to struct proc */
48 #define EVFILT_SIGNAL (-6) /* attached to struct proc */
49 #define EVFILT_TIMER (-7) /* timers */
50 #define EVFILT_EXCEPT (-8) /* exceptional conditions */
52 #define EVFILT_MARKER 0xF /* placemarker for tailq */
54 #define EVFILT_SYSCOUNT 8
56 #define EV_SET(kevp_, a, b, c, d, e, f) do { \
57 struct kevent *kevp = (kevp_); \
58 (kevp)->ident = (a); \
59 (kevp)->filter = (b); \
60 (kevp)->flags = (c); \
61 (kevp)->fflags = (d); \
63 (kevp)->udata = (f); \
67 uintptr_t ident; /* identifier for this event */
68 short filter; /* filter for event */
72 void *udata; /* opaque user data identifier */
76 #define EV_ADD 0x0001 /* add event to kq (implies enable) */
77 #define EV_DELETE 0x0002 /* delete event from kq */
78 #define EV_ENABLE 0x0004 /* enable event */
79 #define EV_DISABLE 0x0008 /* disable event (not reported) */
82 #define EV_ONESHOT 0x0010 /* only report one occurrence */
83 #define EV_CLEAR 0x0020 /* clear event state after reporting */
85 #define EV_SYSFLAGS 0xF000 /* reserved by system */
86 #define EV_FLAG1 0x2000 /* filter-specific flag */
89 #define EV_EOF 0x8000 /* EOF detected */
90 #define EV_ERROR 0x4000 /* error, data contains errno */
91 #define EV_NODATA 0x1000 /* EOF and no more data */
94 * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
96 #define NOTE_LOWAT 0x0001 /* low water mark */
99 * data/hint flags for EVFILT_EXCEPT, shared with userspace and with
100 * EVFILT_{READ|WRITE}
102 #define NOTE_OOB 0x0002 /* OOB data on a socket */
105 * data/hint flags for EVFILT_VNODE, shared with userspace
107 #define NOTE_DELETE 0x0001 /* vnode was removed */
108 #define NOTE_WRITE 0x0002 /* data contents changed */
109 #define NOTE_EXTEND 0x0004 /* size increased */
110 #define NOTE_ATTRIB 0x0008 /* attributes changed */
111 #define NOTE_LINK 0x0010 /* link count changed */
112 #define NOTE_RENAME 0x0020 /* vnode was renamed */
113 #define NOTE_REVOKE 0x0040 /* vnode access was revoked */
116 * data/hint flags for EVFILT_PROC, shared with userspace
118 #define NOTE_EXIT 0x80000000 /* process exited */
119 #define NOTE_FORK 0x40000000 /* process forked */
120 #define NOTE_EXEC 0x20000000 /* process exec'd */
121 #define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */
122 #define NOTE_PDATAMASK 0x000fffff /* mask for pid */
124 /* additional flags for EVFILT_PROC */
125 #define NOTE_TRACK 0x00000001 /* follow across forks */
126 #define NOTE_TRACKERR 0x00000002 /* could not track child */
127 #define NOTE_CHILD 0x00000004 /* am a child process */
129 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
132 SLIST_HEAD(klist, knote);
135 * Used to maintain information about processes that wish to be
136 * notified when I/O becomes possible.
139 struct klist ki_note; /* kernel note list */
140 struct notifymsglist ki_mlist; /* list of pending predicate messages */
148 * Global token for kqueue subsystem
150 extern struct lwkt_token kq_token;
152 #ifdef MALLOC_DECLARE
153 MALLOC_DECLARE(M_KQUEUE);
156 #define KNOTE(list, hint) if ((list) != NULL) knote(list, hint)
159 * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also
160 * shared by EVFILT_PROC (all knotes attached to p->p_klist)
162 * NOTE_OLDAPI is used to signal that standard filters are being called
163 * from the select/poll wrapper.
165 #define NOTE_SIGNAL 0x08000000
166 #define NOTE_OLDAPI 0x04000000 /* select/poll note */
168 #define FILTEROP_ISFD 0x0001 /* if ident == filedescriptor */
169 #define FILTEROP_MPSAFE 0x0002
174 /* f_attach returns 0 on success or valid error code on failure */
175 int (*f_attach) (struct knote *kn);
176 void (*f_detach) (struct knote *kn);
178 /* f_event returns boolean truth */
179 int (*f_event) (struct knote *kn, long hint);
183 SLIST_ENTRY(knote) kn_link; /* for fd */
184 TAILQ_ENTRY(knote) kn_kqlink; /* for kq_knlist */
185 SLIST_ENTRY(knote) kn_next; /* for struct kqinfo */
186 TAILQ_ENTRY(knote) kn_tqe; /* for kq_head */
187 struct kqueue *kn_kq; /* which queue we are on */
188 struct kevent kn_kevent;
190 int kn_sfflags; /* saved filter flags */
191 intptr_t kn_sdata; /* saved data field */
193 struct file *p_fp; /* file data pointer */
194 struct proc *p_proc; /* proc pointer */
196 struct filterops *kn_fop;
200 #define KN_ACTIVE 0x0001 /* event has been triggered */
201 #define KN_QUEUED 0x0002 /* event is on queue */
202 #define KN_DISABLED 0x0004 /* event is disabled */
203 #define KN_DETACHED 0x0008 /* knote is detached */
204 #define KN_REPROCESS 0x0010 /* force reprocessing race */
205 #define KN_DELETING 0x0020 /* deletion in progress */
206 #define KN_PROCESSING 0x0040 /* event processing in prog */
207 #define KN_WAITING 0x0080 /* waiting on processing */
209 #define kn_id kn_kevent.ident
210 #define kn_filter kn_kevent.filter
211 #define kn_flags kn_kevent.flags
212 #define kn_fflags kn_kevent.fflags
213 #define kn_data kn_kevent.data
214 #define kn_fp kn_ptr.p_fp
221 typedef int (*k_copyout_fn)(void *arg, struct kevent *kevp, int count,
223 typedef int (*k_copyin_fn)(void *arg, struct kevent *kevp, int max,
225 int kern_kevent(struct kqueue *kq, int nevents, int *res, void *uap,
226 k_copyin_fn kevent_copyin, k_copyout_fn kevent_copyout,
227 struct timespec *tsp);
229 extern void knote(struct klist *list, long hint);
230 extern void knote_insert(struct klist *klist, struct knote *kn);
231 extern void knote_remove(struct klist *klist, struct knote *kn);
232 /*extern void knote_empty(struct klist *list);*/
233 extern void knote_assume_knotes(struct kqinfo *, struct kqinfo *,
234 struct filterops *, void *);
235 extern void knote_fdclose(struct file *fp, struct filedesc *fdp, int fd);
236 extern void kqueue_init(struct kqueue *kq, struct filedesc *fdp);
237 extern void kqueue_terminate(struct kqueue *kq);
238 extern int kqueue_register(struct kqueue *kq, struct kevent *kev);
242 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
244 #include <sys/cdefs.h>
249 int kevent (int, const struct kevent *, int, struct kevent *,
250 int, const struct timespec *);
252 #endif /* !_KERNEL */
254 #endif /* !_SYS_EVENT_H_ */