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Date: Wed, 25 Jan 2006 16:14:52 -0800
From: Sam Leffler <sam@errno.com>
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To: Robert Watson <rwatson@freebsd.org>
References: <20060124075437.B67285@xorpc.icir.org>
	<43D67C6E.7020403@errno.com>	<43D6811D.9070309@elischer.org>	<20060124.231504.74682748.sthaug@nethelp.no>	<20060124223539.GH69162@funkthat.com>
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Cc: rizzo@icir.org, John-Mark Gurney <gurney_j@resnet.uoregon.edu>,
	julian@elischer.org, sthaug@nethelp.no, current@freebsd.org
Subject: Re: if_flags usage etc.
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Robert Watson wrote:
> 
> 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.

I am not aware of any drivers that do not generate the events; only 
drivers that do not properly detect link status changes.

	Sam