Re: TTY frames parameters

[Alan Mackenzie]

Hi, Eli,

On Sun, Aug 24, 2008 at 11:39:37PM +0300, Eli Zaretskii wrote:
> There's a strange subtle difference between the first tty frame
> created on a default terminal and all the other frames: the first one
> has its `tty' association with nil cdr, while the rest have
> "/dev/tty".  Is that a bug?

What does the frame parameter tty mean?  I couldn't find it described in
the Elisp manual.  Surely _that_ is a bug.

> To reproduce:

>   emacs -Q -nw
>   M-: (frame-parameter (selected-frame) 'tty) RET => nil
>   C-x 5 b foo
>   M-: (frame-parameter (selected-frame) 'tty) RET => "/dev/tty"

On Emacs 22, there doesn't seem to be a frame-parameter called tty.  On
Emacs 23, (running as emacs -Q on a Linux tty), I get the same symptoms
as you do.

> You will also see that in the initial frame, (frame-parameters)
> returns an alist that contains `(tty)', not `(tty . "/dev/tty")' as in
> the other frames.

-- 
Alan Mackenzie (Nuremberg, Germany).