[regression-3.6] Pipe between Cygwin and non Cygwin (CRT/URT) randomly loses characters

Wed Feb 19 07:23:04 GMT 2025

On 2025年2月19日 07:59:00 +0100
Cedric Blancher wrote:
> 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

Please provide full command line that can reproduce your problem.
> 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.

Do you mean the result is as expected with cygwin 3.5.7?
-- 
Takashi Yano <takashi.yano@nifty.ne.jp>