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
32 #define EVFILT_READ (-1)
33 #define EVFILT_WRITE (-2)
34 #define EVFILT_AIO (-3) /* attached to aio requests */
35 #define EVFILT_VNODE (-4) /* attached to vnodes */
36 #define EVFILT_PROC (-5) /* attached to struct proc */
37 #define EVFILT_SIGNAL (-6) /* attached to struct proc */
38 #define EVFILT_TIMER (-7) /* timers */
39 #define EVFILT_NETDEV (-8) /* network devices */
41 #define EVFILT_SYSCOUNT 8
43 #define EV_SET(kevp, a, b, c, d, e, f) do { \
44 (kevp)->ident = (a); \
45 (kevp)->filter = (b); \
46 (kevp)->flags = (c); \
47 (kevp)->fflags = (d); \
49 (kevp)->udata = (f); \
53 uintptr_t ident; /* identifier for this event */
54 short filter; /* filter for event */
58 void *udata; /* opaque user data identifier */
62 #define EV_ADD 0x0001 /* add event to kq (implies enable) */
63 #define EV_DELETE 0x0002 /* delete event from kq */
64 #define EV_ENABLE 0x0004 /* enable event */
65 #define EV_DISABLE 0x0008 /* disable event (not reported) */
68 #define EV_ONESHOT 0x0010 /* only report one occurrence */
69 #define EV_CLEAR 0x0020 /* clear event state after reporting */
71 #define EV_SYSFLAGS 0xF000 /* reserved by system */
72 #define EV_FLAG1 0x2000 /* filter-specific flag */
75 #define EV_EOF 0x8000 /* EOF detected */
76 #define EV_ERROR 0x4000 /* error, data contains errno */
79 * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
81 #define NOTE_LOWAT 0x0001 /* low water mark */
84 * data/hint flags for EVFILT_VNODE, shared with userspace
86 #define NOTE_DELETE 0x0001 /* vnode was removed */
87 #define NOTE_WRITE 0x0002 /* data contents changed */
88 #define NOTE_EXTEND 0x0004 /* size increased */
89 #define NOTE_ATTRIB 0x0008 /* attributes changed */
90 #define NOTE_LINK 0x0010 /* link count changed */
91 #define NOTE_RENAME 0x0020 /* vnode was renamed */
92 #define NOTE_REVOKE 0x0040 /* vnode access was revoked */
95 * data/hint flags for EVFILT_PROC, shared with userspace
97 #define NOTE_EXIT 0x80000000 /* process exited */
98 #define NOTE_FORK 0x40000000 /* process forked */
99 #define NOTE_EXEC 0x20000000 /* process exec'd */
100 #define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */
101 #define NOTE_PDATAMASK 0x000fffff /* mask for pid */
103 /* additional flags for EVFILT_PROC */
104 #define NOTE_TRACK 0x00000001 /* follow across forks */
105 #define NOTE_TRACKERR 0x00000002 /* could not track child */
106 #define NOTE_CHILD 0x00000004 /* am a child process */
109 * data/hint flags for EVFILT_NETDEV, shared with userspace
111 #define NOTE_LINKUP 0x0001 /* link is up */
112 #define NOTE_LINKDOWN 0x0002 /* link is down */
113 #define NOTE_LINKINV 0x0004 /* link state is invalid */
116 * This is currently visible to userland to work around broken
117 * programs which pull in <sys/proc.h>.
119 #include <sys/queue.h>
121 SLIST_HEAD(klist, knote);
125 #ifdef MALLOC_DECLARE
126 MALLOC_DECLARE(M_KQUEUE);
129 #define KNOTE(list, hint) if ((list) != NULL) knote(list, hint)
132 * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also
133 * shared by EVFILT_PROC (all knotes attached to p->p_klist)
135 #define NOTE_SIGNAL 0x08000000
138 int f_isfd; /* true if ident == filedescriptor */
139 int (*f_attach)(struct knote *kn);
140 void (*f_detach)(struct knote *kn);
141 int (*f_event)(struct knote *kn, long hint);
145 SLIST_ENTRY(knote) kn_link; /* for fd */
146 SLIST_ENTRY(knote) kn_selnext; /* for struct selinfo */
147 TAILQ_ENTRY(knote) kn_tqe;
148 struct kqueue *kn_kq; /* which queue we are on */
149 struct kevent kn_kevent;
151 int kn_sfflags; /* saved filter flags */
152 intptr_t kn_sdata; /* saved data field */
154 struct file *p_fp; /* file data pointer */
155 struct proc *p_proc; /* proc pointer */
157 struct filterops *kn_fop;
159 #define KN_ACTIVE 0x01 /* event has been triggered */
160 #define KN_QUEUED 0x02 /* event is on queue */
161 #define KN_DISABLED 0x04 /* event is disabled */
162 #define KN_DETACHED 0x08 /* knote is detached */
164 #define kn_id kn_kevent.ident
165 #define kn_filter kn_kevent.filter
166 #define kn_flags kn_kevent.flags
167 #define kn_fflags kn_kevent.fflags
168 #define kn_data kn_kevent.data
169 #define kn_fp kn_ptr.p_fp
175 extern void knote(struct klist *list, long hint);
176 extern void knote_remove(struct thread *p, struct klist *list);
177 extern void knote_fdclose(struct thread *p, int fd);
178 extern int kqueue_register(struct kqueue *kq,
179 struct kevent *kev, struct thread *p);
180 extern int kqueue_add_filteropts(int filt, struct filterops *filtops);
181 extern int kqueue_del_filteropts(int filt);
185 #include <sys/cdefs.h>
190 int kevent(int kq, const struct kevent *changelist, int nchanges,
191 struct kevent *eventlist, int nevents,
192 const struct timespec *timeout);
195 #endif /* !_KERNEL */
197 #endif /* !_SYS_EVENT_H_ */