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Date: Wed, 19 Feb 2025 07:59:00 +0100
Message-ID: <CALXu0Ue6z-QgfG3o7waBQ=n17xhAQAAH_Lx+0tyXGsKzhLMmtg@mail.gmail.com>
Subject: [regression-3.6] Pipe between Cygwin and non Cygwin (CRT/URT)
 randomly loses characters
To: cygwin AT cygwin DOT com
From: Cedric Blancher via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Cedric Blancher <cedric DOT blancher AT gmail DOT com>
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Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

Good morning!

Cygwin 3.6.0-0.374.g4dd859d01c22.x86_64 on Win10/AMD64/64bit:

Pipe between Cygwin and non Cygwin (CRT/URT) randomly loses
characters. We do not have a reproducer yet, but it is happening at
least hourly on our test machines. Sometimes we only get a single
character, and sometimes words are missing.

Typically it happens like this:
bash -c 'typeset bar="$( powershell -Command ...) ; echo "${bar}""',
where bar does not contain the full output
Same happens with dash and ksh93.

This does not happen between Cygwin processes, i.e. if I compile a
program with UCRT and read from a Cygwin program it fails, and if I
compile the same sources against Cygwin and pipe it into a Cygwin
program it works.

Ced
-- 
Cedric Blancher <cedric DOT blancher AT gmail DOT com>
[https://plus.google.com/u/0/+CedricBlancher/]
Institute Pasteur

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