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To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
CC: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
Subject: RE: [EXTERNAL] Re: scp stalls on uploading in cygwin 3.5 current
 master.
Thread-Topic: [EXTERNAL] Re: scp stalls on uploading in cygwin 3.5 current
 master.
Thread-Index: AQHZ1juS/PjVpg8vtUumO/YZ+jANLa/5JiKAgAGPQQCAACIyAIAAE45w
Date: Fri, 25 Aug 2023 12:08:46 +0000
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From: "Lavrentiev, Anton \(NIH/NLM/NCBI\) \[C\] via Cygwin" <cygwin AT cygwin DOT com>
Reply-To: "Lavrentiev, Anton \(NIH/NLM/NCBI\) \[C\]" <lavr AT ncbi DOT nlm DOT nih DOT gov>
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Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

> I don't have an answer to this problem yet.
> 
> Can we use send(sock, "", 0) to reenable FD_WRITE, perhaps?

Can't it just be assumed that the socket is _always_ writeable _unless_ the last send() failed?
In other words, try to always send() if it did not fail before.  If it did, only send() after
FD_WRITE was returned in the event mask.

We do that in our code and it works without any issues with any sorts of timeouts (including none).

Anton Lavrentiev
Contractor NIH/NLM/NCBI


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