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 */
40 #define EVFILT_READ (-1)
41 #define EVFILT_WRITE (-2)
42 #define EVFILT_AIO (-3) /* attached to aio requests */
43 #define EVFILT_VNODE (-4) /* attached to vnodes */
44 #define EVFILT_PROC (-5) /* attached to struct proc */
45 #define EVFILT_SIGNAL (-6) /* attached to struct proc */
46 #define EVFILT_TIMER (-7) /* timers */
47 #define EVFILT_EXCEPT (-8) /* exceptional conditions */
49 #define EVFILT_MARKER 0xF /* placemarker for tailq */
51 #define EVFILT_SYSCOUNT 8
53 #define EV_SET(kevp_, a, b, c, d, e, f) do { \
54 struct kevent *kevp = (kevp_); \
55 (kevp)->ident = (a); \
56 (kevp)->filter = (b); \
57 (kevp)->flags = (c); \
58 (kevp)->fflags = (d); \
60 (kevp)->udata = (f); \
64 uintptr_t ident; /* identifier for this event */
65 short filter; /* filter for event */
69 void *udata; /* opaque user data identifier */
73 #define EV_ADD 0x0001 /* add event to kq (implies enable) */
74 #define EV_DELETE 0x0002 /* delete event from kq */
75 #define EV_ENABLE 0x0004 /* enable event */
76 #define EV_DISABLE 0x0008 /* disable event (not reported) */
79 #define EV_ONESHOT 0x0010 /* only report one occurrence */
80 #define EV_CLEAR 0x0020 /* clear event state after reporting */
82 #define EV_SYSFLAGS 0xF000 /* reserved by system */
83 #define EV_FLAG1 0x2000 /* filter-specific flag */
86 #define EV_EOF 0x8000 /* EOF detected */
87 #define EV_ERROR 0x4000 /* error, data contains errno */
90 * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
92 #define NOTE_LOWAT 0x0001 /* low water mark */
95 * data/hint flags for EVFILT_EXCEPT, shared with userspace and with
98 #define NOTE_OOB 0x0002 /* OOB data on a socket */
101 * data/hint flags for EVFILT_VNODE, shared with userspace
103 #define NOTE_DELETE 0x0001 /* vnode was removed */
104 #define NOTE_WRITE 0x0002 /* data contents changed */
105 #define NOTE_EXTEND 0x0004 /* size increased */
106 #define NOTE_ATTRIB 0x0008 /* attributes changed */
107 #define NOTE_LINK 0x0010 /* link count changed */
108 #define NOTE_RENAME 0x0020 /* vnode was renamed */
109 #define NOTE_REVOKE 0x0040 /* vnode access was revoked */
112 * data/hint flags for EVFILT_PROC, shared with userspace
114 #define NOTE_EXIT 0x80000000 /* process exited */
115 #define NOTE_FORK 0x40000000 /* process forked */
116 #define NOTE_EXEC 0x20000000 /* process exec'd */
117 #define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */
118 #define NOTE_PDATAMASK 0x000fffff /* mask for pid */
120 /* additional flags for EVFILT_PROC */
121 #define NOTE_TRACK 0x00000001 /* follow across forks */
122 #define NOTE_TRACKERR 0x00000002 /* could not track child */
123 #define NOTE_CHILD 0x00000004 /* am a child process */
126 * This is currently visible to userland to work around broken
127 * programs which pull in <sys/proc.h> or <sys/select.h>.
129 #include <sys/queue.h>
131 SLIST_HEAD(klist, knote);
136 * Global token for kqueue subsystem
138 extern struct lwkt_token kq_token;
140 #ifdef MALLOC_DECLARE
141 MALLOC_DECLARE(M_KQUEUE);
144 #define KNOTE(list, hint) if ((list) != NULL) knote(list, hint)
147 * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also
148 * shared by EVFILT_PROC (all knotes attached to p->p_klist)
150 #define NOTE_SIGNAL 0x08000000
152 #define FILTEROP_ISFD 0x0001 /* if ident == filedescriptor */
153 #define FILTEROP_MPSAFE 0x0002
158 /* f_attach returns 0 on success or valid error code on failure */
159 int (*f_attach) (struct knote *kn);
160 void (*f_detach) (struct knote *kn);
162 /* f_event returns boolean truth */
163 int (*f_event) (struct knote *kn, long hint);
167 SLIST_ENTRY(knote) kn_link; /* for fd */
168 TAILQ_ENTRY(knote) kn_kqlink; /* for kq_knlist */
169 SLIST_ENTRY(knote) kn_next; /* for struct kqinfo */
170 TAILQ_ENTRY(knote) kn_tqe; /* for kq_head */
171 struct kqueue *kn_kq; /* which queue we are on */
172 struct kevent kn_kevent;
174 int kn_sfflags; /* saved filter flags */
175 intptr_t kn_sdata; /* saved data field */
177 struct file *p_fp; /* file data pointer */
178 struct proc *p_proc; /* proc pointer */
180 struct filterops *kn_fop;
182 #define KN_ACTIVE 0x01 /* event has been triggered */
183 #define KN_QUEUED 0x02 /* event is on queue */
184 #define KN_DISABLED 0x04 /* event is disabled */
185 #define KN_DETACHED 0x08 /* knote is detached */
187 #define kn_id kn_kevent.ident
188 #define kn_filter kn_kevent.filter
189 #define kn_flags kn_kevent.flags
190 #define kn_fflags kn_kevent.fflags
191 #define kn_data kn_kevent.data
192 #define kn_fp kn_ptr.p_fp
196 * Used to maintain information about processes that wish to be
197 * notified when I/O becomes possible.
200 struct klist ki_note; /* kernel note list */
201 struct notifymsglist ki_mlist; /* list of pending predicate messages */
209 typedef int (*k_copyout_fn)(void *arg, struct kevent *kevp, int count,
211 typedef int (*k_copyin_fn)(void *arg, struct kevent *kevp, int max,
213 int kern_kevent(struct kqueue *kq, int nevents, int *res, void *uap,
214 k_copyin_fn kevent_copyin, k_copyout_fn kevent_copyout,
215 struct timespec *tsp);
217 extern void knote(struct klist *list, long hint);
218 extern void knote_insert(struct klist *klist, struct knote *kn);
219 extern void knote_remove(struct klist *klist, struct knote *kn);
220 extern void knote_empty(struct klist *list);
221 extern void knote_fdclose(struct file *fp, struct filedesc *fdp, int fd);
222 extern void kqueue_init(struct kqueue *kq, struct filedesc *fdp);
223 extern void kqueue_terminate(struct kqueue *kq);
224 extern int kqueue_register(struct kqueue *kq, struct kevent *kev);
228 #if !defined(_KERNEL) || defined(_KERNEL_VIRTUAL)
230 #include <sys/cdefs.h>
235 int kevent (int, const struct kevent *, int, struct kevent *,
236 int, const struct timespec *);
238 #endif /* !_KERNEL */
240 #endif /* !_SYS_EVENT_H_ */