Mail Archives: cygwin/2022/07/09/17:06:15

Ken Brown <kbrown AT cornell DOT edu> · Sat, 9 Jul 2022 17:05:50 -0400

On 7/9/2022 11:37 AM, Lavrentiev, Anton (NIH/NLM/NCBI) [C] via Cygwin wrote:
> Hi all,
> 
> It took me awhile to figure this one out, but I think I have a good test case to
> demonstrate a (rather serious, actually) issue with Cygwin sockets and select/poll.
> 
> In short, when a reading end of a socket half closes for write (basically, signaling the
> other end of no more data to expect, resulting in TCP FIN and, subsequently, EOF in the other
> end's read()), if that end keeps reading the still incoming remaining data, it will face with
> a lot of "exception" conditions, which are just spurious.

This was fixed in Cygwin 3.3.0, as the announcement of the latter stated:

   https://cygwin.com/pipermail/cygwin-announce/2021-October/010268.html

You stated in a different thread that you have chosen to use an old version of 
Cygwin for your everyday work.  But you can still run a parallel Cygwin 
installation that you keep up to date, so that you can check whether a bug has 
been fixed before reporting it.

Ken

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Date:	Sat, 9 Jul 2022 17:05:50 -0400
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Subject:	Re: Spurious / persistent "exception" condition in half-closed sockets
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