/** @file  ../include/sys/event.h

@internalComponent

*/

/** @def	EVFILT_READ

They are some pre-defined system filter

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/** @def	EVFILT_WRITE

They are some pre-defined system filter

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/** @def	EVFILT_AIO

attached to aio requests

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/** @def	EVFILT_VNODE

attached to vnodes

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/** @def	EVFILT_PROC

attached to struct proc

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/** @def	EVFILT_SIGNAL

attached to struct proc

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/** @def	EVFILT_TIMER

timers

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/** @def	EVFILT_NETDEV

network devices

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/** @def	EVFILT_FS

filesystem events

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/** @struct kevent

Contains the following members,

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/** @var kevent::ident

identifier for this event

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/** @var kevent::filter

filter for event

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/** @var kevent::flags

action flags for kqueue

*/

/** @var kevent::fflags

filter flag value 

*/

/** @var kevent::data

filter data value

*/

/** @var kevent::udata

opaque user data identifier

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/** @def EV_SET(kevp_, a, b, c, d, e, f)

The EV_SET() macro is provided for ease of initializing a kevent structure. 

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/** @def EV_ADD		

It is an action.. add event to kq (implies enable).

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/** @def EV_DELETE

It is an action.. delete event from kq

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/** @def EV_ENABLE

It is an action.. enable event.

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/** @def EV_DISABLE	

It is an action.. disable event (not reported)

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/** @def EV_ONESHOT	

flags supported. only report one occurrence.

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/** @def EV_CLEAR

flags supported. clear event state after reporting .

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/** @def EV_EOF		

returned value.EOF detected.

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/** @def EV_ERROR	

returned value. error, data contains errno.

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/** @def EV_SYSFLAGS	

flags supported. reserved by system.

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/** @def EV_FLAG1	

flags supported. filter-specific flag.

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/** @struct knote 

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/** @var knote::kn_link

for kq

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/** @var knote::kn_selnext

for struct selinfo

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/** @var knote::kn_knlist

f_attach populated

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/** @var knote::kn_tqe

identifier for this event

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/** @var knote::kn_kq

which queue we are on 

*/

/** @var knote::kn_kevent

identifier for this event

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/** @var knote::kn_status

protected by kq lock

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/** @var knote::kn_sfflags

saved filter flags

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/** @var knote::kn_sdata

saved data field 

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/** @var knote::kn_fop

identifier for this event

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/** @var knote::kn_hook

identifier for this event

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/** @def NOTE_LOWAT	

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/** @def NOTE_DELETE	

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/** @def NOTE_WRITE	

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/** @def NOTE_EXTEND	

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/** @def NOTE_ATTRIB	

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/** @def NOTE_LINK	

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/** @def NOTE_RENAME	

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/** @def NOTE_REVOKE	

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/** @def NOTE_EXIT	

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/** @def NOTE_FORK	

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/** @def NOTE_EXEC	

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/** @def NOTE_TRACK	

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/** @def NOTE_TRACKERR	

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/** @def NOTE_CHILD	

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/** @def NOTE_PCTRLMASK	

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/** @def NOTE_PDATAMASK	

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/** @def NOTE_LINKUP	

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/** @def NOTE_LINKDOWN	

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/** @def NOTE_LINKINV	

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*/