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Message-ID:	<CANoQjJvm5NgztRQo1y-wn1_kGO-j6JKmGsqUkOm1yaNBb7qQvQ@mail.gmail.com>
Subject:	Ctrl+C is sometimes ignored on Windows Terminal
To:	cygwin AT cygwin DOT com
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From:	Naoto Aoki via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Naoto Aoki <naoto DOT november AT gmail DOT com>
Sender:	"Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

--0000000000008bb3be05cfb6083a
Content-Type: text/plain; charset="UTF-8"

Hi,

When I'm using some programs such as bash and python from cygwin under
Windows Terminal, Ctrl+C is sometimes ignored.
https://github.com/microsoft/terminal

Normally holding 'Ctrl' and pressing 'C' will make new line.
But, sometimes it does not and unholding 'Ctrl' makes new line under
Windows Terminal.
bash from msys2 does also reproduce this issue.

I dug into this issue and found that this is related to
readline and Windows 10's pseudo console (ConPTY).
I made simple programs to reproduce this issue.

 - EchoCon.cpp
   - modification of ConPty sample code provided by Microsoft.
     This program execute bash on pseudo console.
     to be compiled with MSVC.
 - getkey.cpp
   - simple program to check Ctrl+C is passed to Cygwin program.
     to be compiled with Cygwin gcc.
 - rltest.cpp
   - simple program to check SIGINT handling.
     This program reproduces the issue.
     If you replace readline("> ") with gets(buf),
     then the issue does not happen.
     to be compiled with Cygwin gcc.

- The machine and OS that it is running on
  - OS: Windows 10 Pro 19043.1288
  - Windows Terminal: 1.11.2921.0

Regards,
Naoto Aoki

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