linux-kernel - Re: TCP stack behaviour question

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Message-Id: <200609181631.10625.ak@suse.de>
Date:	Mon, 18 Sep 2006 16:31:10 +0200
From:	Andi Kleen <ak@...e.de>
To:	"Stuart MacDonald" <stuartm@...necttech.com>
Cc:	linux-kernel@...r.kernel.org,
	"Michael Kerrisk" <mtk-manpages@....net>
Subject: Re: TCP stack behaviour question

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.

-Andi
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