2 * Copyright (c) 1999,2000 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
42 uintptr_t ident; /* identifier for this event */
43 short filter; /* filter for event */
47 void *udata; /* opaque user data identifier */
51 #define EV_ADD 0x0001 /* add event to kq (implies enable) */
52 #define EV_DELETE 0x0002 /* delete event from kq */
53 #define EV_ENABLE 0x0004 /* enable event */
54 #define EV_DISABLE 0x0008 /* disable event (not reported) */
57 #define EV_ONESHOT 0x0010 /* only report one occurrence */
58 #define EV_CLEAR 0x0020 /* clear event state after reporting */
60 #define EV_SYSFLAGS 0xF000 /* reserved by system */
61 #define EV_FLAG1 0x2000 /* filter-specific flag */
64 #define EV_EOF 0x8000 /* EOF detected */
65 #define EV_ERROR 0x4000 /* error, data contains errno */
68 * data/hint flags for EVFILT_VNODE, shared with userspace
70 #define NOTE_DELETE 0x0001 /* vnode was removed */
71 #define NOTE_WRITE 0x0002 /* data contents changed */
72 #define NOTE_EXTEND 0x0004 /* size increased */
73 #define NOTE_ATTRIB 0x0008 /* attributes changed */
74 #define NOTE_LINK 0x0010 /* link count changed */
75 #define NOTE_RENAME 0x0020 /* vnode was renamed */
78 * data/hint flags for EVFILT_PROC, shared with userspace
80 #define NOTE_EXIT 0x80000000 /* process exited */
81 #define NOTE_FORK 0x40000000 /* process forked */
82 #define NOTE_EXEC 0x20000000 /* process exec'd */
83 #define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */
84 #define NOTE_PDATAMASK 0x000fffff /* mask for pid */
86 /* additional flags for EVFILT_PROC */
87 #define NOTE_TRACK 0x00000001 /* follow across forks */
88 #define NOTE_TRACKERR 0x00000002 /* could not track child */
89 #define NOTE_CHILD 0x00000004 /* am a child process */
92 * This is currently visible to userland to work around broken
93 * programs which pull in <sys/proc.h> or <sys/select.h>.
95 #include <sys/queue.h>
97 SLIST_HEAD(klist, struct knote);
101 #define KNOTE(list, hint) if ((list) != NULL) knote(list, hint)
104 * Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also
105 * shared by EVFILT_PROC (all knotes attached to p->p_klist)
107 #define NOTE_SIGNAL 0x08000000
110 int f_isfd; /* true if ident == filedescriptor */
111 int (*f_attach) __P((struct knote *kn));
112 void (*f_detach) __P((struct knote *kn));
113 int (*f_event) __P((struct knote *kn, long hint));
117 SLIST_ENTRY(struct knote) kn_link; /* for fd */
118 SLIST_ENTRY(struct knote) kn_selnext; /* for struct selinfo */
119 TAILQ_ENTRY(struct knote) kn_tqe;
120 struct kqueue *kn_kq; /* which queue we are on */
121 struct kevent kn_kevent;
123 int kn_sfflags; /* saved filter flags */
124 intptr_t kn_sdata; /* saved data field */
126 struct file *p_fp; /* file data pointer */
127 struct proc *p_proc; /* proc pointer */
129 struct filterops *kn_fop;
130 #define KN_ACTIVE 0x01 /* event has been triggered */
131 #define KN_QUEUED 0x02 /* event is on queue */
132 #define KN_DISABLED 0x04 /* event is disabled */
133 #define KN_DETACHED 0x08 /* knote is detached */
135 #define kn_id kn_kevent.ident
136 #define kn_filter kn_kevent.filter
137 #define kn_flags kn_kevent.flags
138 #define kn_fflags kn_kevent.fflags
139 #define kn_data kn_kevent.data
140 #define kn_fp kn_ptr.p_fp
145 extern void knote(struct klist *list, long hint);
146 extern void knote_remove(struct proc *p, struct klist *list);
147 extern void knote_fdclose(struct proc *p, int fd);
148 extern int kqueue_register(struct kqueue *kq,
149 struct kevent *kev, struct proc *p);
153 #include <sys/cdefs.h>
157 int kqueue __P((void));
158 int kevent __P((int kq, int nchanges, struct kevent **changelist,
159 int nevents, struct kevent *eventlist,
160 struct timespec *timeout));
163 #endif /* !_KERNEL */
165 #endif /* !_SYS_EVENT_H_ */