"tmux open terminal failed: not a terminal" in terminal emulators other than mintty
Sat May 16 19:35:25 GMT 2020
On Fri, 27 Mar 2020 at 21:15, Michael Wild via Cygwin <firstname.lastname@example.org>
> As the maintainer of the tmux Cygwin package I have to admit that I have no
> idea how to fix this. Sorry.
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
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
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
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.
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