From owner-freebsd-hackers@FreeBSD.ORG  Wed Apr 23 07:29:10 2008
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Date: Wed, 23 Apr 2008 10:29:00 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: Jille <jille@quis.cx>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: devctl (alike?) for devfs
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on 23/04/2008 00:06 Jille said the following:
> Andriy Gapon wrote:
>> Maybe this is a crazy idea or maybe we already have something like this.
>> Is it possible to get notifications about changes in devfs - appearance
>> and disappearance of devices (in devfs sense of the word)?
>> devctl currently notifies about real (hardware) devices handled by
>> device drivers and some notifications about hardware/driver events.
>> But what if I want to automatically run some action if
>> /dev/ufs/magic-label appears?
>> Or if I want to monitor appearance and disappearance of ad* and da*
>> devices (without having to monitor low level drivers like umass)?
>>
> 
> I don't know whether it is what you are looking for, but take a look at 
> devd(8).

devd reads devctl

-- 
Andriy Gapon