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 */
39 #define EVFILT_SYSCOUNT 6
41 #define EV_SET(kevp, a, b, c, d, e, f) do { \
42 (kevp)->ident = (a); \
43 (kevp)->filter = (b); \
44 (kevp)->flags = (c); \
45 (kevp)->fflags = (d); \
47 (kevp)->udata = (f); \
51 uintptr_t ident; /* identifier for this event */
52 short filter; /* filter for event */
56 void *udata; /* opaque user data identifier */
60 #define EV_ADD 0x0001 /* add event to kq (implies enable) */
61 #define EV_DELETE 0x0002 /* delete event from kq */
62 #define EV_ENABLE 0x0004 /* enable event */
63 #define EV_DISABLE 0x0008 /* disable event (not reported) */
66 #define EV_ONESHOT 0x0010 /* only report one occurrence */
67 #define EV_CLEAR 0x0020 /* clear event state after reporting */
69 #define EV_SYSFLAGS 0xF000 /* reserved by system */
70 #define EV_FLAG1 0x2000 /* filter-specific flag */
73 #define EV_EOF 0x8000 /* EOF detected */
74 #define EV_ERROR 0x4000 /* error, data contains errno */
77 * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace
79 #define NOTE_LOWAT 0x0001 /* low water mark */
82 * data/hint flags for EVFILT_VNODE, shared with userspace
84 #define NOTE_DELETE 0x0001 /* vnode was removed */
85 #define NOTE_WRITE 0x0002 /* data contents changed */
86 #define NOTE_EXTEND 0x0004 /* size increased */
87 #define NOTE_ATTRIB 0x0008 /* attributes changed */
88 #define NOTE_LINK 0x0010 /* link count changed */
89 #define NOTE_RENAME 0x0020 /* vnode was renamed */
90 #define NOTE_REVOKE 0x0040 /* vnode access was revoked */
93 * data/hint flags for EVFILT_PROC, shared with userspace
95 #define NOTE_EXIT 0x80000000 /* process exited */
96 #define NOTE_FORK 0x40000000 /* process forked */
97 #define NOTE_EXEC 0x20000000 /* process exec'd */
98 #define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */
99 #define NOTE_PDATAMASK 0x000fffff /* mask for pid */
101 /* additional flags for EVFILT_PROC */
102 #define NOTE_TRACK 0x00000001 /* follow across forks */
103 #define NOTE_TRACKERR 0x00000002 /* could not track child */
104 #define NOTE_CHILD 0x00000004 /* am a child process */
107 * This is currently visible to userland to work around broken
108 * programs which pull in <sys/proc.h> or <sys/select.h>.
110 #include <sys/queue.h>
112 SLIST_HEAD(klist, knote);
116 #define KNOTE(list, hint) if ((list) != NULL) knote(list, hint)
119 * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also
120 * shared by EVFILT_PROC (all knotes attached to p->p_klist)
122 #define NOTE_SIGNAL 0x08000000
125 int f_isfd; /* true if ident == filedescriptor */
126 int (*f_attach) __P((struct knote *kn));
127 void (*f_detach) __P((struct knote *kn));
128 int (*f_event) __P((struct knote *kn, long hint));
132 SLIST_ENTRY(knote) kn_link; /* for fd */
133 SLIST_ENTRY(knote) kn_selnext; /* for struct selinfo */
134 TAILQ_ENTRY(knote) kn_tqe;
135 struct kqueue *kn_kq; /* which queue we are on */
136 struct kevent kn_kevent;
138 int kn_sfflags; /* saved filter flags */
139 intptr_t kn_sdata; /* saved data field */
141 struct file *p_fp; /* file data pointer */
142 struct proc *p_proc; /* proc pointer */
144 struct filterops *kn_fop;
146 #define KN_ACTIVE 0x01 /* event has been triggered */
147 #define KN_QUEUED 0x02 /* event is on queue */
148 #define KN_DISABLED 0x04 /* event is disabled */
149 #define KN_DETACHED 0x08 /* knote is detached */
151 #define kn_id kn_kevent.ident
152 #define kn_filter kn_kevent.filter
153 #define kn_flags kn_kevent.flags
154 #define kn_fflags kn_kevent.fflags
155 #define kn_data kn_kevent.data
156 #define kn_fp kn_ptr.p_fp
161 extern void knote(struct klist *list, long hint);
162 extern void knote_remove(struct proc *p, struct klist *list);
163 extern void knote_fdclose(struct proc *p, int fd);
164 extern int kqueue_register(struct kqueue *kq,
165 struct kevent *kev, struct proc *p);
169 #include <sys/cdefs.h>
173 int kqueue __P((void));
174 int kevent __P((int kq, const struct kevent *changelist, int nchanges,
175 struct kevent *eventlist, int nevents,
176 const struct timespec *timeout));
179 #endif /* !_KERNEL */
181 #endif /* !_SYS_EVENT_H_ */