linux-kernel - Re: TCP stack behaviour question

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Message-Id: <200609181554.15820.ak@suse.de>
Date:	Mon, 18 Sep 2006 15:54:15 +0200
From:	Andi Kleen <ak@...e.de>
To:	"Stuart MacDonald" <stuartm@...necttech.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: TCP stack behaviour question


> # 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)

-Andi
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