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From: Robert Watson <rwatson@FreeBSD.org>
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To: John-Mark Gurney <gurney_j@resnet.uoregon.edu>
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Cc: rizzo@icir.org, julian@elischer.org, sthaug@nethelp.no, current@freebsd.org
Subject: Re: if_flags usage etc.
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On Tue, 24 Jan 2006, John-Mark Gurney wrote:

> sthaug@nethelp.no wrote this message on Tue, Jan 24, 2006 at 23:15 +0100:
>>> We should probably better document the interface "interface". if we are
>>> going to (as Sam suggests)
>>> do some cleanups we might as well consider what other changes should be
>>> put in at the same time.
>>
>> A couple of other suggestions:
>>
>> - For software routers (quagga, zebra etc.) it would be very nice to
>> have "link up" / "link down" notifications to the routing process(es).
>
> already supported, either through kqueue, routing socket, or devd (I 
> believe)...

However, I believe some interface drivers don't generate these events. 
Drivers not supporting a specific event delivered by an interrupt probably 
need to learn to poll for state changes so that they can generate an event.

Robert N M Watson