New implementation of pseudo console support (experimental)

[Takashi Yano]

On Fri, 24 Jul 2020 14:38:42 +0900
Takashi Yano via Cygwin-developers <cygwin-developers@cygwin.com> wrote:
> On Thu, 23 Jul 2020 09:33:28 +0900
> Takashi Yano via Cygwin-developers <cygwin-developers@cygwin.com> wrote:
> > On Wed, 22 Jul 2020 17:45:41 +0900
> > Takashi Yano via Cygwin-developers <cygwin-developers@cygwin.com> wrote:
> > > On Wed, 22 Jul 2020 03:17:51 +0900
> > > Takashi Yano via Cygwin-developers <cygwin-developers@cygwin.com> wrote:
> > > > Hi Corinna,
> > > > 
> > > > On Mon, 20 Jul 2020 10:06:13 +0200
> > > > Corinna Vinschen wrote:
> > > > > On Jul 18 14:30, Takashi Yano via Cygwin-developers wrote:
> > > > > > Hi Corinna,
> > > > > > 
> > > > > > On Fri, 17 Jul 2020 13:19:12 +0200
> > > > > > Corinna Vinschen wrote:
> > > > > > > Hi Takashi,
> > > > > > > 
> > > > > > > On Jul  1 20:47, Takashi Yano via Cygwin-developers wrote:
> > > > > > > > [...]
> > > > > > > > Revise the patch to fit the current git head.
> > > > > > > 
> > > > > > > are you satisfied with the code?  If you want to merge it,
> > > > > > > I'd bump Cygwin to 3.2.
> > > > > > 
> > > > > > Since this new implementation has both advantages and disadvantages,
> > > > > > there might be some options.
> > > > > > 
> > > > > > 1) Default to new implementation and leave the current one as an
> > > > > >   alternative. Switch them using the environment CYGWIN.
> > > > > > 2) Default to current implementation and add the new one as an
> > > > > >   alternative. Switch them using the environment CYGWIN.
> > > > > > 3) Adopt only new implementation and throw the current one away.
> > > > > > 
> > > > > > What do you think?
> > > > > 
> > > > > Do you really want to maintain twice as much code doing the same stuff
> > > > > and constantly having to ask users which version of the code they are
> > > > > running?  The maintenance cost outweighs the advantages, IMHO.
> > > > > Personally I'd go for option 3.
> > > > 
> > > > Personally, I feel a tinge of sadness to discard the current code,
> > > > however, your opinion sounds reasonable.
> > > > 
> > > > I will submit a new patch in which all the codes specific to the
> > > > current implementation are removed.
> > > 
> > > Attached is the patch in git format-patch format.
> > > All the codes specific to the current implementation are removed.
> > > 
> > > Despite the utmost care, the changes are relatively large, so some
> > > degradation may exist.
> > > 
> > > I will appreciate if you could test.
> > 
> > There were still unused code. Please try attached patch instead.
> 
> Changes:
> * Do not activate pseudo console if it is already activated for
>   another process on same pty.

Changes:
* Fix a bug in the latest change.

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>
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