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Date: Thu, 03 Mar 2011 17:54:12 -0600 From: Chris Friesen <chris.friesen@...band.com> To: David Miller <davem@...emloft.net> CC: dev@...o22.de, linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: Re: Network link detection On 03/03/2011 04:01 PM, 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 :-/ My apologies for misleading the original poster. I can only claim a brain fart since I've actually used rtnetlink for other things. > 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. For future reference then, to listen for link state notifications you'd use NETLINK_ROUTE with nl_groups set to RTMGRP_LINK, and the link state will be signaled in the if_flags field of received messages? Chris -- Chris Friesen Software Developer GENBAND chris.friesen@...band.com www.genband.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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