linux-kernel - RE: TCP stack behaviour question

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Date:	Mon, 18 Sep 2006 13:01:20 -0400
From:	"Stuart MacDonald" <stuartm@...necttech.com>
To:	"'Michael Kerrisk'" <mtk-manpages@....net>,
	"'Andi Kleen'" <ak@...e.de>
Cc:	<linux-kernel@...r.kernel.org>
Subject: RE: TCP stack behaviour question

From: Michael Kerrisk [mailto:mtk-manpages@....net] 
> Von: Andi Kleen <ak@...e.de>
> > On Monday 18 September 2006 16:19, Stuart MacDonald wrote:
> > > From: Andi Kleen [mailto:ak@...e.de] 
> > > > > # man 7 ip
> > > > > ..
> > > > >                Note that TCP has no error queue; 
> MSG_ERRQUEUE is
> > > > > illegal on SOCK_STREAM sockets.  Thus all errors are 
> returned by
> > > > > socket function return or SO_ERROR only.
> > > > > 
> > > > > Maybe the man page is wrong? That's from my FC 3 install.
> > > > 
> > > > The sentence is correct, but TCP has a IP_RECVERR that works
> > > > differently without a queue. Basically it doesn't delay 
> the error 
> > > > reporting for incoming ICMPs to the last retransmit, but reports
> > > > them immediately. This is documented in tcp(7)
> > > 
> > > I read that too, but didn't know which one was correct, 
> so I erred on
> > > the side of caution and believed ip(7).
> > 
> > Ok maybe it's a bit misleading. Michael, you might want to clarify.
> 
> Can some one of you propose a better text please?

Perhaps

Note that TCP has no error queue; MSG_ERRQUEUE is illegal on
SOCK_STREAM sockets.  IP_RECVERR is valid for TCP, but all errors are
returned by socket function return or SO_ERROR only.

?

..Stu

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