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Date:	Thu, 28 Aug 2025 09:55:43 +0200
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Subject:	Re: pty read loop losing data in wsl context
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From:	Thomas Wolff via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Thomas Wolff <towo AT towo DOT net>
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Am 28.08.2025 um 07:31 schrieb Kevin Schnitzius via Cygwin:
> On Wed, Aug 27, 2025 at 11:37 PM Thomas Wolff via Cygwin
> <cygwin AT cygwin DOT com> wrote:
>
>> What’s the role of ^O in this puzzle? Does it trigger something in cygwin?
>> Is there anything peculiar that would cause pty chunks not be recognised
>> and then skipped in such a loop?
> discard = ^O
>
>         * discard CHAR
>                CHAR will toggle discarding of output
>
> Does a second ^O undo the problem?
No.
I am aware of the historic ^O flush function, even available on pre-Unix 
operating systems (DEC TOPS).
That function would not explain the erratic behaviour seen with WSL.

> "The equivalent of this is 'flush', but that was never documented
> as an option (though was output with stty -a).  Therefore use
> the more descriptive name, also generally used on BSD systems.
> Note even though this setting seems ineffective on Linux, supporting
> the setting is useful to allow terminal programs to receive
> the default ^O character code."
>
> https://lists.gnu.org/archive/html/coreutils/2015-01/msg00068.html
I saw that patch. It is in no way what it claims, a "documentation" of 
the setting.
>
> I really have no idea about how this is supposed to work...
>
> Kevin
>


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