linux-kernel - Re: Network link detection

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Date:	Thu, 03 Mar 2011 14:01:06 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	chris.friesen@...band.com
Cc:	dev@...o22.de, linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Network link detection

From: Chris Friesen <chris.friesen@...band.com>
Date: Thu, 03 Mar 2011 15:38:35 -0600

> You might look at whether you could write a kernel module to register
> for NETDEV_CHANGE notifications and pass that back to userspace.

This is the kind of responses you get when you ask networking specific
questions and don't CC: netdev :-/

There is this thing called netlink, you can listen for arbitrary
network state change events on a socket, and get the link state
notifications you are looking for.  It's in use by many real
applications like NetworkManager and co.
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