netdev - Re: Network link detection

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Date:	Thu, 3 Mar 2011 23:29:57 +0100
From:	Nico Schümann <dev@...o22.de>
To:	David Miller <davem@...emloft.net>
Cc:	chris.friesen@...band.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: Network link detection

On Thu, Mar 03, 2011 at 02:01:06PM -0800, David Miller wrote:
> 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 :-/
> 

Thank you for CC.

> 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.

That really looks like what I'm looking for. I was already wondering 
where NetworkManager gets the link state changes from, but I just 
expected it to poll. So now I'll read a bit of documentation and 
hopefully get it work.

Thanks to everyone,

Nico
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