netdev - Re: netlink recvmsg() and MSG

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Message-ID: <20070306155750.7827ab1d@freekitty>
Date:	Tue, 6 Mar 2007 15:57:50 -0800
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	davem@...emloft.net (David Miller), netdev@...r.kernel.org
Subject: Re: netlink recvmsg() and MSG_TRUNC

On Wed, 07 Mar 2007 10:49:07 +1100
Herbert Xu <herbert@...dor.apana.org.au> wrote:

> David Miller <davem@...emloft.net> wrote:
> > 
> > I guess one thing the user could do when it sees MSG_TRUNC
> > is keep calling recvmsg() until the receive queue is emptied
> > of packets, in order to get that pesky nlk->cb cleared to
> > NULL, then resubmit.
> > 
> > But that's rediculous and complicated.
> > 
> > Any ideas?
> 
> Which netlink family generates (or needs to generate) unbounded
> messages to user-space? Or indeed which ones generate messages
> greater than 64K (or 4K for that matter)?
> 
> Cheers,

I know some commands send big blocks down of configuration information.
One example is netem statistical data, but there are others.

-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
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