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

/*
 * Copyright (c) 2003-2005 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_OSREFERENCE_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_LICENSE_OSREFERENCE_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 */

#if __DARWIN_ALIGN_POWER
#pragma options align=power
#endif

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

#if __DARWIN_ALIGN_POWER
#pragma options align=reset
#endif

#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	*
8ad349bb	4	* @APPLE_LICENSE_OSREFERENCE_HEADER_START@
55e303ae	5	*
8ad349bb 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
	10	* License may not be used to create, or enable the creation or
	11	* redistribution of, unlawful or unlicensed copies of an Apple operating
	12	* system, or to circumvent, violate, or enable the circumvention or
	13	* violation of, any terms of an Apple operating system software license
	14	* agreement.
	15	*
	16	* Please obtain a copy of the License at
	17	* http://www.opensource.apple.com/apsl/ and read it before using this
	18	* file.
	19	*
	20	* The Original Code and all software distributed under the License are
	21	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	22	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	23	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	24	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	25	* Please see the License for the specific language governing rights and
	26	* limitations under the License.
	27	*
	28	* @APPLE_LICENSE_OSREFERENCE_HEADER_END@
55e303ae A	29	*/
	30	/*-
	31	* Copyright (c) 1999,2000,2001 Jonathan Lemon <jlemon@FreeBSD.org>
	32	* All rights reserved.
	33	*
	34	* Redistribution and use in source and binary forms, with or without
	35	* modification, are permitted provided that the following conditions
	36	* are met:
	37	* 1. Redistributions of source code must retain the above copyright
	38	* notice, this list of conditions and the following disclaimer.
	39	* 2. Redistributions in binary form must reproduce the above copyright
	40	* notice, this list of conditions and the following disclaimer in the
	41	* documentation and/or other materials provided with the distribution.
	42	*
	43	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	44	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	45	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	46	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	47	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	48	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	49	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	50	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	51	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	52	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	53	* SUCH DAMAGE.
	54	*
	55	* $FreeBSD: src/sys/sys/event.h,v 1.5.2.5 2001/12/14 19:21:22 jlemon Exp $
	56	*/
	57
	58	#ifndef _SYS_EVENT_H_
	59	#define _SYS_EVENT_H_
	60
91447636 A	61	#include <machine/types.h>
	62	#include <sys/cdefs.h>
	63	#include <stdint.h>
	64
55e303ae A	65	#define EVFILT_READ (-1)
	66	#define EVFILT_WRITE (-2)
	67	#define EVFILT_AIO (-3) /* attached to aio requests */
	68	#define EVFILT_VNODE (-4) /* attached to vnodes */
	69	#define EVFILT_PROC (-5) /* attached to struct proc */
	70	#define EVFILT_SIGNAL (-6) /* attached to struct proc */
	71	#define EVFILT_TIMER (-7) /* timers */
	72	#define EVFILT_MACHPORT (-8) /* Mach ports */
	73	#define EVFILT_FS (-9) /* Filesystem events */
	74
	75	#define EVFILT_SYSCOUNT 9
91447636 A	76	#define EVFILT_THREADMARKER EVFILT_SYSCOUNT /* Internal use only */
91447636 A	77
8ad349bb A	78	#if __DARWIN_ALIGN_POWER
	79	#pragma options align=power
	80	#endif
55e303ae A	81
	82	struct kevent {
	83	uintptr_t ident; /* identifier for this event */
	84	short filter; /* filter for event */
91447636 A	85	unsigned short flags; /* general flags */
	86	unsigned int fflags; /* filter-specific flags */
	87	intptr_t data; /* filter-specific data */
	88	#ifdef KERNEL_PRIVATE
	89	user_addr_t udata; /* opaque user data identifier */
	90	#else
55e303ae	91	void udata; / opaque user data identifier */
91447636 A	92	#endif
	93	};
	94
	95	#ifdef KERNEL_PRIVATE
	96
	97	struct user_kevent {
	98	uint64_t ident; /* identifier for this event */
	99	short filter; /* filter for event */
	100	unsigned short flags; /* general flags */
	101	unsigned int fflags; /* filter-specific flags */
	102	int64_t data; /* filter-specific data */
	103	user_addr_t udata; /* opaque user data identifier */
55e303ae A	104	};
55e303ae A	105
91447636 A	106	#endif
91447636 A	107
8ad349bb A	108	#if __DARWIN_ALIGN_POWER
	109	#pragma options align=reset
	110	#endif
91447636	111
55e303ae A	112	#define EV_SET(kevp, a, b, c, d, e, f) do { \
	113	struct kevent *__kevp__ = (kevp); \
	114	__kevp__->ident = (a); \
	115	__kevp__->filter = (b); \
	116	__kevp__->flags = (c); \
	117	__kevp__->fflags = (d); \
	118	__kevp__->data = (e); \
	119	__kevp__->udata = (f); \
	120	} while(0)
	121
	122	/* actions */
	123	#define EV_ADD 0x0001 /* add event to kq (implies enable) */
	124	#define EV_DELETE 0x0002 /* delete event from kq */
	125	#define EV_ENABLE 0x0004 /* enable event */
	126	#define EV_DISABLE 0x0008 /* disable event (not reported) */
	127
	128	/* flags */
	129	#define EV_ONESHOT 0x0010 /* only report one occurrence */
	130	#define EV_CLEAR 0x0020 /* clear event state after reporting */
	131
	132	#define EV_SYSFLAGS 0xF000 /* reserved by system */
91447636	133	#define EV_FLAG0 0x1000 /* filter-specific flag */
55e303ae A	134	#define EV_FLAG1 0x2000 /* filter-specific flag */
	135
	136	/* returned values */
	137	#define EV_EOF 0x8000 /* EOF detected */
	138	#define EV_ERROR 0x4000 /* error, data contains errno */
	139
	140	/*
91447636 A	141	* Filter specific flags for EVFILT_READ
	142	*
	143	* The default behavior for EVFILT_READ is to make the "read" determination
	144	* relative to the current file descriptor read pointer. The EV_POLL
	145	* flag indicates the determination should be made via poll(2) semantics
	146	* (which always returns true for regular files - regardless of the amount
	147	* of unread data in the file).
	148	*
	149	* On input, EV_OOBAND specifies that only OOB data should be looked for.
	150	* The returned data count is the number of bytes beyond the current OOB marker.
	151	*
	152	* On output, EV_OOBAND indicates that OOB data is present
	153	* If it was not specified as an input parameter, then the data count is the
	154	* number of bytes before the current OOB marker. If at the marker, the
	155	* data count indicates the number of bytes available after it. In either
	156	* case, it's the amount of data one could expect to receive next.
55e303ae	157	*/
91447636 A	158	#define EV_POLL EV_FLAG0
91447636 A	159	#define EV_OOBAND EV_FLAG1
55e303ae A	160
55e303ae A	161	/*
91447636 A	162	* data/hint fflags for EVFILT_{READ\|WRITE}, shared with userspace
	163	*
	164	* The default behavior for EVFILT_READ is to make the determination
	165	* realtive to the current file descriptor read pointer.
	166	*/
	167	#define NOTE_LOWAT 0x00000001 /* low water mark */
	168	/*
	169	* data/hint fflags for EVFILT_VNODE, shared with userspace
55e303ae	170	*/
91447636 A	171	#define NOTE_DELETE 0x00000001 /* vnode was removed */
	172	#define NOTE_WRITE 0x00000002 /* data contents changed */
	173	#define NOTE_EXTEND 0x00000004 /* size increased */
	174	#define NOTE_ATTRIB 0x00000008 /* attributes changed */
	175	#define NOTE_LINK 0x00000010 /* link count changed */
	176	#define NOTE_RENAME 0x00000020 /* vnode was renamed */
	177	#define NOTE_REVOKE 0x00000040 /* vnode access was revoked */
55e303ae A	178
55e303ae A	179	/*
91447636	180	* data/hint fflags for EVFILT_PROC, shared with userspace
55e303ae A	181	*/
	182	#define NOTE_EXIT 0x80000000 /* process exited */
	183	#define NOTE_FORK 0x40000000 /* process forked */
	184	#define NOTE_EXEC 0x20000000 /* process exec'd */
	185	#define NOTE_PCTRLMASK 0xf0000000 /* mask for hint bits */
	186	#define NOTE_PDATAMASK 0x000fffff /* mask for pid */
	187
91447636 A	188	/*
	189	* data/hint fflags for EVFILT_TIMER, shared with userspace.
	190	* The default is a (repeating) interval timer with the data
	191	* specifying the timeout interval in milliseconds.
	192	*
	193	* All timeouts are implicitly EV_CLEAR events.
	194	*/
	195	#define NOTE_SECONDS 0x00000001 /* data is seconds */
	196	#define NOTE_USECONDS 0x00000002 /* data is microseconds */
	197	#define NOTE_NSECONDS 0x00000004 /* data is nanoseconds */
	198	#define NOTE_ABSOLUTE 0x00000008 /* absolute timeout */
	199	/* ... implicit EV_ONESHOT */
	200
55e303ae A	201	/* additional flags for EVFILT_PROC */
	202	#define NOTE_TRACK 0x00000001 /* follow across forks */
	203	#define NOTE_TRACKERR 0x00000002 /* could not track child */
	204	#define NOTE_CHILD 0x00000004 /* am a child process */
	205
	206
55e303ae	207
91447636 A	208	#ifndef KERNEL
	209	/* Temporay solution for BootX to use inode.h till kqueue moves to vfs layer */
	210	#include <sys/queue.h>
	211	struct knote;
	212	SLIST_HEAD(klist, knote);
	213	#endif
	214
	215	#ifdef KERNEL
	216
	217	#ifdef KERNEL_PRIVATE
55e303ae A	218	#include <sys/queue.h>
	219
	220	#ifdef MALLOC_DECLARE
	221	MALLOC_DECLARE(M_KQUEUE);
	222	#endif
	223
	224	/*
	225	* Flag indicating hint is a signal. Used by EVFILT_SIGNAL, and also
	226	* shared by EVFILT_PROC (all knotes attached to p->p_klist)
	227	*/
	228	#define NOTE_SIGNAL 0x08000000
	229
91447636 A	230	TAILQ_HEAD(kqtailq, knote); /* a list of "queued" events */
91447636 A	231
55e303ae	232	struct knote {
91447636 A	233	int kn_inuse; /* inuse count */
	234	struct kqtailq kn_tq; / pointer to tail queue */
	235	TAILQ_ENTRY(knote) kn_tqe; /* linkage for tail queue */
	236	struct kqueue kn_kq; / which kqueue we are on */
	237	SLIST_ENTRY(knote) kn_link; /* linkage for search list */
55e303ae	238	SLIST_ENTRY(knote) kn_selnext; /* klist element chain */
55e303ae	239	union {
91447636	240	struct fileproc p_fp; / file data pointer */
55e303ae A	241	struct proc p_proc; / proc pointer */
	242	} kn_ptr;
	243	struct filterops *kn_fop;
91447636	244	int kn_status; /* status bits */
55e303ae A	245	int kn_sfflags; /* saved filter flags */
55e303ae A	246	struct kevent kn_kevent;
55e303ae	247	caddr_t kn_hook;
91447636 A	248	int kn_hookid;
	249	int64_t kn_sdata; /* saved data field */
	250
55e303ae A	251	#define KN_ACTIVE 0x01 /* event has been triggered */
	252	#define KN_QUEUED 0x02 /* event is on queue */
	253	#define KN_DISABLED 0x04 /* event is disabled */
91447636 A	254	#define KN_DROPPING 0x08 /* knote is being dropped */
	255	#define KN_USEWAIT 0x10 /* wait for knote use */
	256	#define KN_DROPWAIT 0x20 /* wait for knote drop */
55e303ae A	257
	258	#define kn_id kn_kevent.ident
	259	#define kn_filter kn_kevent.filter
	260	#define kn_flags kn_kevent.flags
	261	#define kn_fflags kn_kevent.fflags
	262	#define kn_data kn_kevent.data
	263	#define kn_fp kn_ptr.p_fp
	264	};
	265
	266	struct filterops {
	267	int f_isfd; /* true if ident == filedescriptor */
91447636 A	268	int (f_attach)(struct knote kn);
	269	void (f_detach)(struct knote kn);
	270	int (f_event)(struct knote kn, long hint);
55e303ae A	271	};
	272
	273	struct proc;
	274
	275	SLIST_HEAD(klist, knote);
	276	extern void klist_init(struct klist *list);
	277
	278	#define KNOTE(list, hint) knote(list, hint)
	279	#define KNOTE_ATTACH(list, kn) knote_attach(list, kn)
	280	#define KNOTE_DETACH(list, kn) knote_detach(list, kn)
	281
	282
	283	extern void knote(struct klist *list, long hint);
	284	extern int knote_attach(struct klist list, struct knote kn);
	285	extern int knote_detach(struct klist list, struct knote kn);
55e303ae	286	extern void knote_fdclose(struct proc *p, int fd);
55e303ae	287
91447636 A	288	#endif /* !KERNEL_PRIVATE */
	289
	290	#else /* KERNEL */
55e303ae	291
55e303ae	292
55e303ae A	293	struct timespec;
	294
	295	__BEGIN_DECLS
91447636 A	296	int kqueue(void);
91447636 A	297	int kevent(int kq, const struct kevent *changelist, int nchanges,
55e303ae	298	struct kevent *eventlist, int nevents,
91447636	299	const struct timespec *timeout);
55e303ae A	300	__END_DECLS
55e303ae A	301
55e303ae	302
91447636 A	303	#ifdef PRIVATE
91447636 A	304	#include <mach/port.h>
55e303ae A	305
55e303ae A	306	__BEGIN_DECLS
91447636 A	307	mach_port_t kqueue_portset_np(int kq);
91447636 A	308	int kqueue_from_portset_np(mach_port_t portset);
55e303ae	309	__END_DECLS
91447636 A	310	#endif /* PRIVATE */
	311
	312	#endif /* KERNEL */
55e303ae	313
55e303ae A	314
55e303ae A	315	#endif /* !_SYS_EVENT_H_ */