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Date:	Sat, 16 May 2020 21:35:25 +0200
Message-ID:	<CABPLASTO5XDHZQbDdhu6uyS6Ci=FhA6zjObPqjcuwyk99daiFQ@mail.gmail.com>
Subject:	Re: "tmux open terminal failed: not a terminal" in terminal emulators
	other than mintty
To:	The Cygwin Mailing List <cygwin AT cygwin DOT com>
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From:	Kacper Michajlow via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Kacper Michajlow <kasper93 AT gmail DOT com>
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On Fri, 27 Mar 2020 at 21:15, Michael Wild via Cygwin <cygwin AT cygwin DOT com>
wrote:

> Hi
>
> As the maintainer of the tmux Cygwin package I have to admit that I have no
> idea how to fix this. Sorry.
>

Hi,

I did take a look how tmux works and what is going on in Cygwin. Here is
short summary of my findings.

* Tmux sends each client stdio fd to the server through socket. Cygwin does
not support passing file descriptors over to other processes so this fails.
* Tmux has a hack for Cygwin where it opens tty by name provided by
client...

And now there are two cases:

1. When there is no pseudo terminal. cmd.exe, (WT and most other terminal
emulators out there)
* Tmux server will try to open /dev/cons<N> by name provided by client, but
this fails with ENOENT, because server process doesn't see this device.

2. When there is allocated pseudo terminal
* Tmux server will try to open /dev/pty<N> by name provided by client and
actually work.

Is there a way to make tmux work with /dev/cons<N>? I have seen in docs

/dev/cons1	Console device names are pseudo device names, only accessible
...		from processes within this very console session.  This is due
		to a restriction in Windows.

So it likely means that whatever we do it will not be accessible from
another process.

Is this docs still holds true in latest Windows? I have seen a path to
always allocate pty for native applications, maybe this would actually
resolve this problem too.

Best Regards,
Kacper
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