[PATCH v2 0/1] Fix PTY state management in pseudo console support.

[Ken Brown]

Hi Takashi,

On 8/31/2019 6:54 PM, Takashi Yano wrote:
> Pseudo console support in test release TEST: Cygwin 3.1.0-0.3,
> introduced by commit 169d65a5774acc76ce3f3feeedcbae7405aa9b57,
> has some bugs which cause mismatch between state variables and
> real pseudo console state regarding console attaching and r/w
> pipe switching. This patch fixes this issue by redesigning the
> state management.

After applying this patch, I get the following in mintty:

$ cygcheck -cd | grep bash
grep: write error: Bad file descriptor

Further commands after that lead to the cursor jumping around.

Here's a second glitch I've noticed (starting with commit 
169d65a5774acc76ce3f3feeedcbae7405aa9b57): In emacs, if I run a command that 
uses compilation mode, the output displayed in the compilation buffer starts 
with ^[[H^[[J.  Here ^[ is the escape character, so this is apparently the two 
ANSI escape sequences ESC[H and ESC[J.

Sample commands that use compilation mode are 'M-x compile', 'M-x rgrep', and 
'M-x find-name-directory'.  I can provide more detailed reproduction 
instructions if you're not an emacs user.

I can also try to make an STC, but that will take me longer.

Ken