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>
37 #define EVFILT_READ (-1)
38 #define EVFILT_WRITE (-2)
39 #define EVFILT_AIO (-3) /* attached to aio requests */
40 #define EVFILT_VNODE (-4) /* attached to vnodes */
41 #define EVFILT_PROC (-5) /* attached to struct proc */
42 #define EVFILT_SIGNAL (-6) /* attached to struct proc */
43 #define EVFILT_TIMER (-7) /* timers */
44 #define EVFILT_EXCEPT (-8) /* exceptional conditions */
46 #define EVFILT_MARKER 0xF /* placemarker for tailq */
48 #define EVFILT_SYSCOUNT 8
50 #define EV_SET(kevp_, a, b, c, d, e, f) do { \
51 struct kevent *kevp = (kevp_); \
52 (kevp)->ident = (a); \
53 (kevp)->filter = (b); \
54 (kevp)->flags = (c); \
55 (kevp)->fflags = (d); \
57 (kevp)->udata = (f); \
61 uintptr_t ident; /* identifier for this event */
62 short filter; /* filter for event */
66 void *udata; /* opaque user data identifier */
70 #define EV_ADD 0x0001 /* add event to kq (implies enable) */
71 #define EV_DELETE 0x0002 /* delete event from kq */
72 #define EV_ENABLE 0x0004 /* enable event */
73 #define EV_DISABLE 0x0008 /* disable event (not reported) */
76 #define EV_ONESHOT 0x0010 /* only report one occurrence */
77 #define EV_CLEAR 0x0020 /* clear event state after reporting */
79 #define EV_SYSFLAGS 0xF000 /* reserved by system */
80 #define EV_FLAG1 0x2000 /* filter-specific flag */
83 #define EV_EOF 0x8000 /* EOF detected */
84 #define EV_ERROR 0x4000 /* error, data contains errno */
87 * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
89 #define NOTE_LOWAT 0x0001 /* low water mark */
92 * data/hint flags for EVFILT_EXCEPT, shared with userspace
94 #define NOTE_OOB 0x0002 /* OOB data on a socket */
97 * data/hint flags for EVFILT_VNODE, shared with userspace
99 #define NOTE_DELETE 0x0001 /* vnode was removed */
100 #define NOTE_WRITE 0x0002 /* data contents changed */
101 #define NOTE_EXTEND 0x0004 /* size increased */
102 #define NOTE_ATTRIB 0x0008 /* attributes changed */
103 #define NOTE_LINK 0x0010 /* link count changed */
104 #define NOTE_RENAME 0x0020 /* vnode was renamed */
105 #define NOTE_REVOKE 0x0040 /* vnode access was revoked */
108 * data/hint flags for EVFILT_PROC, shared with userspace
110 #define NOTE_EXIT 0x80000000 /* process exited */
111 #define NOTE_FORK 0x40000000 /* process forked */
112 #define NOTE_EXEC 0x20000000 /* process exec'd */
113 #define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */
114 #define NOTE_PDATAMASK 0x000fffff /* mask for pid */
116 /* additional flags for EVFILT_PROC */
117 #define NOTE_TRACK 0x00000001 /* follow across forks */
118 #define NOTE_TRACKERR 0x00000002 /* could not track child */
119 #define NOTE_CHILD 0x00000004 /* am a child process */
122 * This is currently visible to userland to work around broken
123 * programs which pull in <sys/proc.h> or <sys/select.h>.
125 #include <sys/queue.h>
127 SLIST_HEAD(klist, knote);
131 #ifdef MALLOC_DECLARE
132 MALLOC_DECLARE(M_KQUEUE);
135 #define KNOTE(list, hint) if ((list) != NULL) knote(list, hint)
138 * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also
139 * shared by EVFILT_PROC (all knotes attached to p->p_klist)
141 #define NOTE_SIGNAL 0x08000000
144 int f_isfd; /* true if ident == filedescriptor */
146 /* f_attach returns 0 on success or valid error code on failure */
147 int (*f_attach) (struct knote *kn);
148 void (*f_detach) (struct knote *kn);
150 /* f_event returns boolean truth */
151 int (*f_event) (struct knote *kn, long hint);
155 SLIST_ENTRY(knote) kn_link; /* for fd */
156 TAILQ_ENTRY(knote) kn_kqlink; /* for kq_knlist */
157 SLIST_ENTRY(knote) kn_selnext; /* for struct selinfo */
158 TAILQ_ENTRY(knote) kn_tqe; /* for kq_head */
159 struct kqueue *kn_kq; /* which queue we are on */
160 struct kevent kn_kevent;
162 int kn_sfflags; /* saved filter flags */
163 intptr_t kn_sdata; /* saved data field */
165 struct file *p_fp; /* file data pointer */
166 struct proc *p_proc; /* proc pointer */
168 struct filterops *kn_fop;
170 #define KN_ACTIVE 0x01 /* event has been triggered */
171 #define KN_QUEUED 0x02 /* event is on queue */
172 #define KN_DISABLED 0x04 /* event is disabled */
173 #define KN_DETACHED 0x08 /* knote is detached */
175 #define kn_id kn_kevent.ident
176 #define kn_filter kn_kevent.filter
177 #define kn_flags kn_kevent.flags
178 #define kn_fflags kn_kevent.fflags
179 #define kn_data kn_kevent.data
180 #define kn_fp kn_ptr.p_fp
188 typedef int (*k_copyout_fn)(void *arg, struct kevent *kevp, int count,
190 typedef int (*k_copyin_fn)(void *arg, struct kevent *kevp, int max,
192 int kern_kevent(struct kqueue *kq, int nevents, int *res, void *uap,
193 k_copyin_fn kevent_copyin, k_copyout_fn kevent_copyout,
194 struct timespec *tsp);
196 extern void knote(struct klist *list, long hint);
197 extern void knote_remove(struct klist *list);
198 extern void knote_fdclose(struct file *fp, struct filedesc *fdp, int fd);
199 extern void kqueue_init(struct kqueue *kq, struct filedesc *fdp);
200 extern void kqueue_terminate(struct kqueue *kq);
201 extern int kqueue_register(struct kqueue *kq, struct kevent *kev);
202 extern void kqueue_wakeup(struct kqueue *kq);
206 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
208 #include <sys/cdefs.h>
213 int kevent (int, const struct kevent *, int, struct kevent *,
214 int, const struct timespec *);
216 #endif /* !_KERNEL */
218 #endif /* !_SYS_EVENT_H_ */