From owner-freebsd-hackers@FreeBSD.ORG  Fri Mar 26 15:17:14 2004
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Date: Fri, 26 Mar 2004 18:17:13 -0500
From: Suleiman Souhlal <refugee@segfaulted.com>
To: Dirk-Willem van Gulik <dirkx@webweaving.org>
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cc: freebsd-hackers@freebsd.org
Subject: Re: events when (de)associating or when cable is (un)plugged
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Hi,

On Fri, 26 Mar 2004 23:30:46 +0100
Dirk-Willem van Gulik <dirkx@webweaving.org> wrote:

> Looking for suggestions on a 'clean' and generic way to allow for
> notifications when a 802.11 association is made or lost, or when
> a ethernet cable is (un)plugged. I.e.akin to the events 'usbd(8) get
> when you sit on /dev/usb. This is for 5.2.1 or beyond.

I am not too sure about 802.11, but to detect when the ethernet cable is
(un)plugged, you can use kqueue(2) with the EVFILT_NETDEV filter.

Later,
  Suleiman Souhlal