[apple/xnu.git] / bsd / sys / event.h

/*
 * Copyright (c) 2003-2005 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*-
 * Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	$FreeBSD: src/sys/sys/event.h,v 1.5.2.5 2001/12/14 19:21:22 jlemon Exp $
 */

#ifndef _SYS_EVENT_H_
#define _SYS_EVENT_H_

#include <machine/types.h>
#include <sys/cdefs.h>
#include <stdint.h>

#define EVFILT_READ		(-1)
#define EVFILT_WRITE		(-2)
#define EVFILT_AIO		(-3)	/* attached to aio requests */
#define EVFILT_VNODE		(-4)	/* attached to vnodes */
#define EVFILT_PROC		(-5)	/* attached to struct proc */
#define EVFILT_SIGNAL		(-6)	/* attached to struct proc */
#define EVFILT_TIMER		(-7)	/* timers */
#define EVFILT_MACHPORT		(-8)	/* Mach ports */
#define EVFILT_FS		(-9)	/* Filesystem events */

#define EVFILT_SYSCOUNT		9
#define EVFILT_THREADMARKER	EVFILT_SYSCOUNT /* Internal use only */

#pragma pack(4)

struct kevent {
	uintptr_t	ident;		/* identifier for this event */
	short		filter;		/* filter for event */
	unsigned short	flags;		/* general flags */
	unsigned int	fflags;		/* filter-specific flags */
	intptr_t	data;		/* filter-specific data */
#ifdef KERNEL_PRIVATE
	user_addr_t	udata;		/* opaque user data identifier */
#else
	void		*udata;		/* opaque user data identifier */
#endif
};

#ifdef KERNEL_PRIVATE

struct user_kevent {
	uint64_t	ident;		/* identifier for this event */
	short		filter;		/* filter for event */
	unsigned short	flags;		/* general flags */
	unsigned int	fflags;		/* filter-specific flags */
	int64_t		data;		/* filter-specific data */
	user_addr_t	udata;		/* opaque user data identifier */
};

#endif

#pragma pack()

#define EV_SET(kevp, a, b, c, d, e, f) do {	\
	struct kevent *__kevp__ = (kevp);	\
	__kevp__->ident = (a);			\
	__kevp__->filter = (b);			\
	__kevp__->flags = (c);			\
	__kevp__->fflags = (d);			\
	__kevp__->data = (e);			\
	__kevp__->udata = (f);			\
} while(0)

/* actions */
#define EV_ADD		0x0001		/* add event to kq (implies enable) */
#define EV_DELETE	0x0002		/* delete event from kq */
#define EV_ENABLE	0x0004		/* enable event */
#define EV_DISABLE	0x0008		/* disable event (not reported) */

/* flags */
#define EV_ONESHOT	0x0010		/* only report one occurrence */
#define EV_CLEAR	0x0020		/* clear event state after reporting */

#define EV_SYSFLAGS	0xF000		/* reserved by system */
#define EV_FLAG0	0x1000		/* filter-specific flag */
#define EV_FLAG1	0x2000		/* filter-specific flag */

/* returned values */
#define EV_EOF		0x8000		/* EOF detected */
#define EV_ERROR	0x4000		/* error, data contains errno */

/*
 * Filter specific flags for EVFILT_READ
 *
 * The default behavior for EVFILT_READ is to make the "read" determination
 * relative to the current file descriptor read pointer. The EV_POLL
 * flag indicates the determination should be made via poll(2) semantics
 * (which always returns true for regular files - regardless of the amount
 * of unread data in the file).
 *
 * On input, EV_OOBAND specifies that only OOB data should be looked for.
 * The returned data count is the number of bytes beyond the current OOB marker.
 *
 * On output, EV_OOBAND indicates that OOB data is present
 * If it was not specified as an input parameter, then the data count is the
 * number of bytes before the current OOB marker. If at the marker, the
 * data count indicates the number of bytes available after it.  In either
 * case, it's the amount of data one could expect to receive next.
 */
#define EV_POLL	EV_FLAG0
#define EV_OOBAND	EV_FLAG1

/*
 * data/hint fflags for EVFILT_{READ|WRITE}, shared with userspace
 *
 * The default behavior for EVFILT_READ is to make the determination
 * realtive to the current file descriptor read pointer.
 */
#define NOTE_LOWAT	0x00000001		/* low water mark */
/*
 * data/hint fflags for EVFILT_VNODE, shared with userspace
 */
#define	NOTE_DELETE	0x00000001		/* vnode was removed */
#define	NOTE_WRITE	0x00000002		/* data contents changed */
#define	NOTE_EXTEND	0x00000004		/* size increased */
#define	NOTE_ATTRIB	0x00000008		/* attributes changed */
#define	NOTE_LINK	0x00000010		/* link count changed */
#define	NOTE_RENAME	0x00000020		/* vnode was renamed */
#define	NOTE_REVOKE	0x00000040		/* vnode access was revoked */

/*
 * data/hint fflags for EVFILT_PROC, shared with userspace
 */
#define	NOTE_EXIT	0x80000000		/* process exited */
#define	NOTE_FORK	0x40000000		/* process forked */
#define	NOTE_EXEC	0x20000000		/* process exec'd */
#define	NOTE_PCTRLMASK	0xf0000000		/* mask for hint bits */
#define	NOTE_PDATAMASK	0x000fffff		/* mask for pid */

/*
 * data/hint fflags for EVFILT_TIMER, shared with userspace.
 * The default is a (repeating) interval timer with the data
 * specifying the timeout interval in milliseconds.
 *
 * All timeouts are implicitly EV_CLEAR events.
 */
#define NOTE_SECONDS	0x00000001		/* data is seconds         */
#define NOTE_USECONDS	0x00000002		/* data is microseconds    */
#define NOTE_NSECONDS	0x00000004		/* data is nanoseconds     */
#define NOTE_ABSOLUTE	0x00000008		/* absolute timeout        */
						/* ... implicit EV_ONESHOT */
 
/* additional flags for EVFILT_PROC */
#define	NOTE_TRACK	0x00000001		/* follow across forks */
#define	NOTE_TRACKERR	0x00000002		/* could not track child */
#define	NOTE_CHILD	0x00000004		/* am a child process */


#ifndef KERNEL
/* Temporay solution for BootX to use inode.h till kqueue moves to vfs layer */
#include <sys/queue.h> 
struct knote;
SLIST_HEAD(klist, knote);
#endif

#ifdef KERNEL

#ifdef KERNEL_PRIVATE
#include <sys/queue.h> 

#ifdef MALLOC_DECLARE
MALLOC_DECLARE(M_KQUEUE);
#endif

/*
 * Flag indicating hint is a signal.  Used by EVFILT_SIGNAL, and also
 * shared by EVFILT_PROC  (all knotes attached to p->p_klist)
 */
#define NOTE_SIGNAL	0x08000000

TAILQ_HEAD(kqtailq, knote);	/* a list of "queued" events */

struct knote {
	int		kn_inuse;	/* inuse count */
	struct kqtailq	*kn_tq;		/* pointer to tail queue */
	TAILQ_ENTRY(knote)	kn_tqe;		/* linkage for tail queue */
	struct kqueue	*kn_kq;	/* which kqueue we are on */
	SLIST_ENTRY(knote)	kn_link;	/* linkage for search list */
	SLIST_ENTRY(knote)	kn_selnext;	/* klist element chain */
	union {
		struct		fileproc *p_fp;	/* file data pointer */
		struct		proc *p_proc;	/* proc pointer */
	} kn_ptr;
	struct			filterops *kn_fop;
	int			kn_status;	/* status bits */
	int			kn_sfflags;	/* saved filter flags */
	struct 			kevent kn_kevent;
	caddr_t			kn_hook;
	int			kn_hookid;
	int64_t			kn_sdata;	/* saved data field */

#define KN_ACTIVE	0x01			/* event has been triggered */
#define KN_QUEUED	0x02			/* event is on queue */
#define KN_DISABLED	0x04			/* event is disabled */
#define KN_DROPPING	0x08			/* knote is being dropped */
#define KN_USEWAIT	0x10			/* wait for knote use */
#define KN_DROPWAIT	0x20			/* wait for knote drop */

#define kn_id		kn_kevent.ident
#define kn_filter	kn_kevent.filter
#define kn_flags	kn_kevent.flags
#define kn_fflags	kn_kevent.fflags
#define kn_data		kn_kevent.data
#define kn_fp		kn_ptr.p_fp
};

struct filterops {
	int	f_isfd;		/* true if ident == filedescriptor */
	int	(*f_attach)(struct knote *kn);
	void	(*f_detach)(struct knote *kn);
	int	(*f_event)(struct knote *kn, long hint);
};

struct proc;

SLIST_HEAD(klist, knote);
extern void	klist_init(struct klist *list);

#define KNOTE(list, hint)	knote(list, hint)
#define KNOTE_ATTACH(list, kn)	knote_attach(list, kn)
#define KNOTE_DETACH(list, kn)	knote_detach(list, kn)


extern void	knote(struct klist *list, long hint);
extern int	knote_attach(struct klist *list, struct knote *kn);
extern int	knote_detach(struct klist *list, struct knote *kn);
extern void	knote_fdclose(struct proc *p, int fd);

#endif /* !KERNEL_PRIVATE */

#else 	/* KERNEL */


struct timespec;

__BEGIN_DECLS
int     kqueue(void);
int     kevent(int kq, const struct kevent *changelist, int nchanges,
		    struct kevent *eventlist, int nevents,
		    const struct timespec *timeout);
__END_DECLS


#ifdef PRIVATE
#include <mach/port.h>

__BEGIN_DECLS
mach_port_t	kqueue_portset_np(int kq);
int	kqueue_from_portset_np(mach_port_t portset);
__END_DECLS
#endif /* PRIVATE */

#endif /* KERNEL */


#endif /* !_SYS_EVENT_H_ */
Commit	Line	Data
55e303ae	1	/*
91447636	2	* Copyright (c) 2003-2005 Apple Computer, Inc. All rights reserved.
55e303ae	3	*
8f6c56a5	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
55e303ae	5	*
8f6c56a5 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
8ad349bb	24	* limitations under the License.
8f6c56a5 A	25	*
8f6c56a5 A	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
55e303ae A	27	*/
	28	/*-
	29	* Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
	30	* All rights reserved.
	31	*
	32	* Redistribution and use in source and binary forms, with or without
	33	* modification, are permitted provided that the following conditions
	34	* are met:
	35	* 1. Redistributions of source code must retain the above copyright
	36	* notice, this list of conditions and the following disclaimer.
	37	* 2. Redistributions in binary form must reproduce the above copyright
	38	* notice, this list of conditions and the following disclaimer in the
	39	* documentation and/or other materials provided with the distribution.
	40	*
	41	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	42	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	43	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	44	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	45	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	46	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	47	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	48	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	49	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	50	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	51	* SUCH DAMAGE.
	52	*
	53	* $FreeBSD: src/sys/sys/event.h,v 1.5.2.5 2001/12/14 19:21:22 jlemon Exp $
	54	*/
	55
	56	#ifndef _SYS_EVENT_H_
	57	#define _SYS_EVENT_H_
	58
91447636 A	59	#include <machine/types.h>
	60	#include <sys/cdefs.h>
	61	#include <stdint.h>
	62
55e303ae A	63	#define EVFILT_READ (-1)
	64	#define EVFILT_WRITE (-2)
	65	#define EVFILT_AIO (-3) /* attached to aio requests */
	66	#define EVFILT_VNODE (-4) /* attached to vnodes */
	67	#define EVFILT_PROC (-5) /* attached to struct proc */
	68	#define EVFILT_SIGNAL (-6) /* attached to struct proc */
	69	#define EVFILT_TIMER (-7) /* timers */
	70	#define EVFILT_MACHPORT (-8) /* Mach ports */
	71	#define EVFILT_FS (-9) /* Filesystem events */
	72
	73	#define EVFILT_SYSCOUNT 9
91447636 A	74	#define EVFILT_THREADMARKER EVFILT_SYSCOUNT /* Internal use only */
91447636 A	75
4452a7af	76	#pragma pack(4)
55e303ae A	77
	78	struct kevent {
	79	uintptr_t ident; /* identifier for this event */
	80	short filter; /* filter for event */
91447636 A	81	unsigned short flags; /* general flags */
	82	unsigned int fflags; /* filter-specific flags */
	83	intptr_t data; /* filter-specific data */
	84	#ifdef KERNEL_PRIVATE
	85	user_addr_t udata; /* opaque user data identifier */
	86	#else
55e303ae	87	void udata; / opaque user data identifier */
91447636 A	88	#endif
	89	};
	90
	91	#ifdef KERNEL_PRIVATE
	92
	93	struct user_kevent {
	94	uint64_t ident; /* identifier for this event */
	95	short filter; /* filter for event */
	96	unsigned short flags; /* general flags */
	97	unsigned int fflags; /* filter-specific flags */
	98	int64_t data; /* filter-specific data */
	99	user_addr_t udata; /* opaque user data identifier */
55e303ae A	100	};
55e303ae A	101
91447636 A	102	#endif
91447636 A	103
4452a7af	104	#pragma pack()
91447636	105
55e303ae A	106	#define EV_SET(kevp, a, b, c, d, e, f) do { \
	107	struct kevent *__kevp__ = (kevp); \
	108	__kevp__->ident = (a); \
	109	__kevp__->filter = (b); \
	110	__kevp__->flags = (c); \
	111	__kevp__->fflags = (d); \
	112	__kevp__->data = (e); \
	113	__kevp__->udata = (f); \
	114	} while(0)
	115
	116	/* actions */
	117	#define EV_ADD 0x0001 /* add event to kq (implies enable) */
	118	#define EV_DELETE 0x0002 /* delete event from kq */
	119	#define EV_ENABLE 0x0004 /* enable event */
	120	#define EV_DISABLE 0x0008 /* disable event (not reported) */
	121
	122	/* flags */
	123	#define EV_ONESHOT 0x0010 /* only report one occurrence */
	124	#define EV_CLEAR 0x0020 /* clear event state after reporting */
	125
	126	#define EV_SYSFLAGS 0xF000 /* reserved by system */
91447636	127	#define EV_FLAG0 0x1000 /* filter-specific flag */
55e303ae A	128	#define EV_FLAG1 0x2000 /* filter-specific flag */
	129
	130	/* returned values */
	131	#define EV_EOF 0x8000 /* EOF detected */
	132	#define EV_ERROR 0x4000 /* error, data contains errno */
	133
	134	/*
91447636 A	135	* Filter specific flags for EVFILT_READ
	136	*
	137	* The default behavior for EVFILT_READ is to make the "read" determination
	138	* relative to the current file descriptor read pointer. The EV_POLL
	139	* flag indicates the determination should be made via poll(2) semantics
	140	* (which always returns true for regular files - regardless of the amount
	141	* of unread data in the file).
	142	*
	143	* On input, EV_OOBAND specifies that only OOB data should be looked for.
	144	* The returned data count is the number of bytes beyond the current OOB marker.
	145	*
	146	* On output, EV_OOBAND indicates that OOB data is present
	147	* If it was not specified as an input parameter, then the data count is the
	148	* number of bytes before the current OOB marker. If at the marker, the
	149	* data count indicates the number of bytes available after it. In either
	150	* case, it's the amount of data one could expect to receive next.
55e303ae	151	*/
91447636 A	152	#define EV_POLL EV_FLAG0
91447636 A	153	#define EV_OOBAND EV_FLAG1
55e303ae A	154
55e303ae A	155	/*
91447636 A	156	* data/hint fflags for EVFILT_{READ\|WRITE}, shared with userspace
	157	*
	158	* The default behavior for EVFILT_READ is to make the determination
	159	* realtive to the current file descriptor read pointer.
	160	*/
	161	#define NOTE_LOWAT 0x00000001 /* low water mark */
	162	/*
	163	* data/hint fflags for EVFILT_VNODE, shared with userspace
55e303ae	164	*/
91447636 A	165	#define NOTE_DELETE 0x00000001 /* vnode was removed */
	166	#define NOTE_WRITE 0x00000002 /* data contents changed */
	167	#define NOTE_EXTEND 0x00000004 /* size increased */
	168	#define NOTE_ATTRIB 0x00000008 /* attributes changed */
	169	#define NOTE_LINK 0x00000010 /* link count changed */
	170	#define NOTE_RENAME 0x00000020 /* vnode was renamed */
	171	#define NOTE_REVOKE 0x00000040 /* vnode access was revoked */
55e303ae A	172
55e303ae A	173	/*
91447636	174	* data/hint fflags for EVFILT_PROC, shared with userspace
55e303ae A	175	*/
	176	#define NOTE_EXIT 0x80000000 /* process exited */
	177	#define NOTE_FORK 0x40000000 /* process forked */
	178	#define NOTE_EXEC 0x20000000 /* process exec'd */
	179	#define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */
	180	#define NOTE_PDATAMASK 0x000fffff /* mask for pid */
	181
91447636 A	182	/*
	183	* data/hint fflags for EVFILT_TIMER, shared with userspace.
	184	* The default is a (repeating) interval timer with the data
	185	* specifying the timeout interval in milliseconds.
	186	*
	187	* All timeouts are implicitly EV_CLEAR events.
	188	*/
	189	#define NOTE_SECONDS 0x00000001 /* data is seconds */
	190	#define NOTE_USECONDS 0x00000002 /* data is microseconds */
	191	#define NOTE_NSECONDS 0x00000004 /* data is nanoseconds */
	192	#define NOTE_ABSOLUTE 0x00000008 /* absolute timeout */
	193	/* ... implicit EV_ONESHOT */
	194
55e303ae A	195	/* additional flags for EVFILT_PROC */
	196	#define NOTE_TRACK 0x00000001 /* follow across forks */
	197	#define NOTE_TRACKERR 0x00000002 /* could not track child */
	198	#define NOTE_CHILD 0x00000004 /* am a child process */
	199
	200
55e303ae	201
91447636 A	202	#ifndef KERNEL
	203	/* Temporay solution for BootX to use inode.h till kqueue moves to vfs layer */
	204	#include <sys/queue.h>
	205	struct knote;
	206	SLIST_HEAD(klist, knote);
	207	#endif
	208
	209	#ifdef KERNEL
	210
	211	#ifdef KERNEL_PRIVATE
55e303ae A	212	#include <sys/queue.h>
	213
	214	#ifdef MALLOC_DECLARE
	215	MALLOC_DECLARE(M_KQUEUE);
	216	#endif
	217
	218	/*
	219	* Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also
	220	* shared by EVFILT_PROC (all knotes attached to p->p_klist)
	221	*/
	222	#define NOTE_SIGNAL 0x08000000
	223
91447636 A	224	TAILQ_HEAD(kqtailq, knote); /* a list of "queued" events */
91447636 A	225
55e303ae	226	struct knote {
91447636 A	227	int kn_inuse; /* inuse count */
	228	struct kqtailq kn_tq; / pointer to tail queue */
	229	TAILQ_ENTRY(knote) kn_tqe; /* linkage for tail queue */
	230	struct kqueue kn_kq; / which kqueue we are on */
	231	SLIST_ENTRY(knote) kn_link; /* linkage for search list */
55e303ae	232	SLIST_ENTRY(knote) kn_selnext; /* klist element chain */
55e303ae	233	union {
91447636	234	struct fileproc p_fp; / file data pointer */
55e303ae A	235	struct proc p_proc; / proc pointer */
	236	} kn_ptr;
	237	struct filterops *kn_fop;
91447636	238	int kn_status; /* status bits */
55e303ae A	239	int kn_sfflags; /* saved filter flags */
55e303ae A	240	struct kevent kn_kevent;
55e303ae	241	caddr_t kn_hook;
91447636 A	242	int kn_hookid;
	243	int64_t kn_sdata; /* saved data field */
	244
55e303ae A	245	#define KN_ACTIVE 0x01 /* event has been triggered */
	246	#define KN_QUEUED 0x02 /* event is on queue */
	247	#define KN_DISABLED 0x04 /* event is disabled */
91447636 A	248	#define KN_DROPPING 0x08 /* knote is being dropped */
	249	#define KN_USEWAIT 0x10 /* wait for knote use */
	250	#define KN_DROPWAIT 0x20 /* wait for knote drop */
55e303ae A	251
	252	#define kn_id kn_kevent.ident
	253	#define kn_filter kn_kevent.filter
	254	#define kn_flags kn_kevent.flags
	255	#define kn_fflags kn_kevent.fflags
	256	#define kn_data kn_kevent.data
	257	#define kn_fp kn_ptr.p_fp
	258	};
	259
	260	struct filterops {
	261	int f_isfd; /* true if ident == filedescriptor */
91447636 A	262	int (f_attach)(struct knote kn);
	263	void (f_detach)(struct knote kn);
	264	int (f_event)(struct knote kn, long hint);
55e303ae A	265	};
	266
	267	struct proc;
	268
	269	SLIST_HEAD(klist, knote);
	270	extern void klist_init(struct klist *list);
	271
	272	#define KNOTE(list, hint) knote(list, hint)
	273	#define KNOTE_ATTACH(list, kn) knote_attach(list, kn)
	274	#define KNOTE_DETACH(list, kn) knote_detach(list, kn)
	275
	276
	277	extern void knote(struct klist *list, long hint);
	278	extern int knote_attach(struct klist list, struct knote kn);
	279	extern int knote_detach(struct klist list, struct knote kn);
55e303ae	280	extern void knote_fdclose(struct proc *p, int fd);
55e303ae	281
91447636 A	282	#endif /* !KERNEL_PRIVATE */
	283
	284	#else /* KERNEL */
55e303ae	285
55e303ae	286
55e303ae A	287	struct timespec;
	288
	289	__BEGIN_DECLS
91447636 A	290	int kqueue(void);
91447636 A	291	int kevent(int kq, const struct kevent *changelist, int nchanges,
55e303ae	292	struct kevent *eventlist, int nevents,
91447636	293	const struct timespec *timeout);
55e303ae A	294	__END_DECLS
55e303ae A	295
55e303ae	296
91447636 A	297	#ifdef PRIVATE
91447636 A	298	#include <mach/port.h>
55e303ae A	299
55e303ae A	300	__BEGIN_DECLS
91447636 A	301	mach_port_t kqueue_portset_np(int kq);
91447636 A	302	int kqueue_from_portset_np(mach_port_t portset);
55e303ae	303	__END_DECLS
91447636 A	304	#endif /* PRIVATE */
	305
	306	#endif /* KERNEL */
55e303ae	307
55e303ae A	308
55e303ae A	309	#endif /* !_SYS_EVENT_H_ */