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RE: recv and errno during a connection reset/closed by peer
- From: "Peter Stephens" <ptfoof at sbcglobal dot net>
- To: <cygwin at cygwin dot com>
- Date: Mon, 28 Mar 2005 18:17:41 -0500
- Subject: RE: recv and errno during a connection reset/closed by peer
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@sbcglobal.net
-----Original Message-----
From: Brian Ford [mailto:ford@vss.fsi.com]
Sent: Monday, March 28, 2005 11:37 AM
To: Peter Stephens
Cc: cygwin@cygwin.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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