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Re: Display of undisplayable characters: \U01F3A8 instead of diamond

From: Alan Mackenzie
Subject: Re: Display of undisplayable characters: \U01F3A8 instead of diamond
Date: Sun, 28 Aug 2022 18:45:45 +0000

Hello, Stefan.

On Sun, Aug 28, 2022 at 14:27:22 -0400, Stefan Monnier wrote:
> > That means either that you're running fbterm and Emacs as root, or that
> > fbterm is installed with a setuid bit or has the SYS_TTY_CONFIG capability,
> > which you can remove (see upthread).

> Isn't there some way to explicitly request the "unprivileged" mode of
> operation (e.g. with a command line arg, config file setting, you name
> it) so it also applies when the application does have the needed
> privilege (e.g. when running as root)?

No, there isn't.  I've been looking at fbterm's source code.  The
"unprivileged" mode is actually a malfunction due to the user having
insufficient privilege to execute certain ioctl commands in the kernel
which configure the keyboard.

When fbterm executes as intended, all the "stolen" key combinations
(with the execption of C-<space> and C-M-k, which have, in effect, been
commented out in the key table) get remapped.  This includes critical
Emacs key sequences such as C-M-e and C-M-c.

>         Stefan

Alan Mackenzie (Nuremberg, Germany).

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