Re: Disable Alt + Ctrl + Backspace selectively

From: Kasper Dupont (kasperd_at_daimi.au.dk)
Date: 01/25/04 

Date: Sun, 25 Jan 2004 03:30:08 +0100

Juergen Heinzl wrote:
>
> In article <ed455a08.0401231245.56b475bf@posting.google.com>, Xin Li wrote:
> > Hi,
> >
> > I would like to configure my system some how so that when non root
> > users logon, the system disables Alt + Ctrl + Backspace from killing
> > X. But when root is logged on, ALt + Ctrl + Backspace should work as
> > usual. I know a DontZap entry in Xconfig will disable it for
> > everyone. But this needs to be a bit more selective. So it seems
> > like I have to write some kind of a program that will look at key
> > strokes and filter out Alt + Ctrl + Backspace combinations.
> [-]
> Here's my entry ...
> ca::ctrlaltdel:/sbin/shutdown -F -t0 -r now
> ...
>
> Of course you don't want to run shutdown here but instead you'd
> need to read /var/run/utmp to see whether root's logged in (see
> utmp(5) for more) and the process id of the X server can be
> found in /tmp/.X0-lock.
>
> Mind though all that isn't going to handle the case of someone
> having done a su -.

I don't see any connection between the question and the
answer. The question was about Ctrl + Alt + Backspace.
The ctrlaltdel line in inittab is irrelevant. The kernel
doesn't interpret keys because X is using the keyboard
in raw mode. So the kernel will never notice Ctrl + Alt
+ Del being pressed.

If you actually want shutdown to verify if root is
logged in before rebooting, just use the -a option. But
that of course doesn't help solving the problem.

I don't know any way to change the behavioure of
Ctrl + Alt + Backspace depending on the user logged in.
The problem obviously is, that X doesn't know which
user is logged in. And I don't understand why you would
want to disable Ctrl + Alt + Backspace. 

-- 
Kasper Dupont -- der bruger for meget tid paa usenet.
For sending spam use mailto:aaarep@daimi.au.dk
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