Change the behaviour of Alt Control Backspace to shutdown machine

Hi I am seting up a web kiosk, that uses a kiosk user to start a cut down web browser. The only shortcut keys that work are the Control + Alt + Back space which logs the user out and brings back the machine to a log in screen. Actually what I would like is for the machine to shut down instead of going back to the log in screen.
Any ideas?

The kiosk is started by automatically logging in the kiosk user, and having a xsession script in their home folder that starts firefox...

while true ; do
   /firefox/firefox -fullscreen
done

I dont fully understand what it is doing but it works!! Seems to start a System default session (its not gnome so i guess it may be twm), and when i hit alt contol back space it finishes that session and go's back to the log in screen. I would rather that users didnt get that screen and it would just shutdown.
uuccuAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

s_oneilCommented:
In X's config file  ( usually /etc/X11/XF86Config, /etc/X11/XF86Config-4 or /etc/X11/xorg.conf ).

Look for a section named ServerLayout, ie mine reads:

Section "ServerLayout"
        Identifier     "XFree86 Configured"
        Screen      0  "Screen0" 0 0
        InputDevice    "Mouse1" "CorePointer"
        InputDevice    "Keyboard0" "CoreKeyboard"
EndSection


To this, add the line:
        Option "DontZap" "true"

(anywhere between the Section and EndSection lines.)

This will prevent X from dying on ctrl+alt+backspace .. I'm not however sure how to handle the next step, of having a client catch ctrl+alt+backspace and call a shutdown from it.

My advice, would be to enable DontZap so they're not returned to the login screen, then handle shutdown requests from /etc/inittab:

# What to do when CTRL-ALT-DEL is pressed.
ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now

.. appears to be the default.  Replacing -r with -h  will cause it to shutdown (to halt) rather than reboot.


0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Linux

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.