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Date: Sat, 26 Apr 2008 05:09:51 -0600 (MDT)
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To: avg@icyb.net.ua
From: "M. Warner Losh" <imp@bsdimp.com>
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Cc: freebsd-hackers@freebsd.org, jille@quis.cx
Subject: Re: devctl (alike?) for devfs
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In message: <480EE53C.40800@icyb.net.ua>
            Andriy Gapon <avg@icyb.net.ua> writes:
: 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

The device events from devctl(4) don't necessarily correspond to /dev
entries that devfs deals with.

Warner