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From: "Peter Stephens" <ptfoof AT sbcglobal DOT net>
To: <cygwin AT cygwin DOT com>
Subject: RE: recv and errno during a connection reset/closed by peer
Date: Mon, 28 Mar 2005 18:17:41 -0500
Message-ID: <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAAUKQItienSEKG+9226yKd5cKAAAAQAAAADZbnjoLqKEeI3+lfe/tpAgEAAAAA@sbcglobal.net>
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In-Reply-To: <Pine.CYG.4.58.0503281033060.3768@fordpc.vss.fsi.com>

Brian

Are you saying that there is no way to distinguish a dropped connection from
a MSG_PEEK with no data to retrieve?

Pete

P.S.  I use this standard: http://www.unix.org/unix03.html .  Is this
incorrect?

Peter A. Stephens
ptfoof AT sbcglobal DOT net

-----Original Message-----
From: Brian Ford [mailto:ford AT vss DOT fsi DOT com] 
Sent: Monday, March 28, 2005 11:37 AM
To: Peter Stephens
Cc: cygwin AT cygwin DOT com
Subject: RE: recv and errno during a connection reset/closed by peer

On Fri, 25 Mar 2005, Peter Stephens wrote:

> I boiled this down to nothing(see below).  I must be missing something 
> basic.

Yup.

> I tried the suggestions made so far and it never gets to:
>
> 	printf(" >>> ERRNO %i\n", errno);
>
> I would expect that on a disconnect (I use putty in telnet or raw 
> mode) it would return -1 whether it is doing MSG_PEEK or an actual 
> retrieval.  No luck.

Nope (http://www.opengroup.org/onlinepubs/7990989775/xns/recv.html):

"If no messages are available to be received and the peer has performed an
orderly shutdown, recv() returns 0."

I think that's what you're missing.

--
Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained pilot...


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