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kqueue.2
101
kqueue.2
@ -1,4 +1,5 @@
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.\" $FreeBSD: Revision: 197243$
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.\" Copyright (c) 2010 Mark Heily
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.\" Copyright (c) 2000 Jonathan Lemon
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.\" All rights reserved.
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.\"
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@ -25,15 +26,13 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd September 15, 2009
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.Dd September 17, 2010
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.Dt KQUEUE 2
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.Os
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.Sh NAME
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.Nm kqueue ,
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.Nm kevent
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.Nd kernel event notification mechanism
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/event.h
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@ -319,26 +318,6 @@ Note that this filter is not supported for vnodes or BPF devices.
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.Pp
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For sockets, the low water mark and socket error handling is
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identical to the EVFILT_READ case.
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.It EVFILT_AIO
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The sigevent portion of the AIO request is filled in, with
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.Va sigev_notify_kqueue
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containing the descriptor of the kqueue that the event should
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be attached to,
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.Va sigev_value
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containing the udata value, and
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.Va sigev_notify
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set to SIGEV_KEVENT.
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When the
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.Fn aio_*
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system call is made, the event will be registered
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with the specified kqueue, and the
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.Va ident
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argument set to the
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.Fa struct aiocb
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returned by the
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.Fn aio_*
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system call.
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The filter returns under the same conditions as aio_error.
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.It EVFILT_VNODE
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Takes a file descriptor as the identifier and the events to watch for in
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.Va fflags ,
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@ -360,47 +339,6 @@ The file referenced by the descriptor had its attributes changed.
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The link count on the file changed.
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.It NOTE_RENAME
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The file referenced by the descriptor was renamed.
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.It NOTE_REVOKE
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Access to the file was revoked via
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.Xr revoke 2
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or the underlying file system was unmounted.
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.El
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.Pp
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On return,
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.Va fflags
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contains the events which triggered the filter.
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.It EVFILT_PROC
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Takes the process ID to monitor as the identifier and the events to watch for
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in
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.Va fflags ,
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and returns when the process performs one or more of the requested events.
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If a process can normally see another process, it can attach an event to it.
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The events to monitor are:
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.Bl -tag -width XXNOTE_TRACKERR
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.It NOTE_EXIT
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The process has exited.
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The exit status will be stored in
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.Va data .
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.It NOTE_FORK
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The process has called
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.Fn fork .
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.It NOTE_EXEC
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The process has executed a new process via
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.Xr execve 2
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or similar call.
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.It NOTE_TRACK
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Follow a process across
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.Fn fork
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calls.
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The parent process will return with NOTE_TRACK set in the
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.Va fflags
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field, while the child process will return with NOTE_CHILD set in
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.Va fflags
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and the parent PID in
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.Va data .
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.It NOTE_TRACKERR
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This flag is returned if the system was unable to attach an event to
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the child process, usually due to resource limitations.
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.El
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.Pp
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On return,
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@ -409,16 +347,14 @@ contains the events which triggered the filter.
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.It EVFILT_SIGNAL
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Takes the signal number to monitor as the identifier and returns
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when the given signal is delivered to the process.
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This coexists with the
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This overrides the
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.Fn signal
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and
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.Fn sigaction
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facilities, and has a lower precedence.
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facilities, and has a higher precedence.
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The filter will record
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all attempts to deliver a signal to a process, even if the signal has
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been marked as SIG_IGN.
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Event notification happens after normal
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signal delivery processing.
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.Va data
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returns the number of times the signal has occurred since the last call to
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.Fn kevent .
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@ -439,23 +375,6 @@ There is a system wide limit on the number of timers
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which is controlled by the
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.Va kern.kq_calloutmax
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sysctl.
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.It Dv EVFILT_NETDEV
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Takes a descriptor to a network interface as the identifier, and the events to watch for in
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.Va fflags .
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It returns, when one or more of the requested events occur on the descriptor.
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The events to monitor are:
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.Bl -tag -width XXNOTE_LINKDOWN
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.It Dv NOTE_LINKUP
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The link is up.
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.It Dv NOTE_LINKDOWN
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The link is down.
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.It Dv NOTE_LINKINV
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The link state is invalid.
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.El
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.Pp
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On return,
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.Va fflags
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contains the events which triggered the filter.
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.It Dv EVFILT_USER
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Establishes a user event identified by
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.Va ident
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@ -594,15 +513,3 @@ The
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.Fn kqueue
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system and this manual page were written by
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.An Jonathan Lemon Aq jlemon@FreeBSD.org .
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.Sh BUGS
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The
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.Dv EVFILT_NETDEV
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filter is currently only implemented for devices that use the
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.Xr miibus 4
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driver for LINKUP and LINKDOWN operations.
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Therefore, it will not work with many non-ethernet devices.
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.Pp
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The
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.Fa timeout
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value is limited to 24 hours; longer timeouts will be silently
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reinterpreted as 24 hours.
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