[fpc-devel] Linux kernel behaviour change regarding keyboard

Schindler Karl-Michael karl-michael.schindler at physik.uni-halle.de
Thu Jul 19 14:15:31 CEST 2007

Am 19. Jul 2007 um 12:16 schrieb Tomas Hajny:

> Marco van de Voort wrote:
>>> Op Wed, 18 Jul 2007, schreef Michael Van Canneyt:
>>>> Under the assumption a setuid root program is the only possible
>>> option:
>>>> The safest - and in my opinion only correct - way is to write a  
>>>> small
>>> setuid
>>>> root program which sets the proper TTY stuff, and then executes the
>>> IDE as
>>>> the normal user.
>>>> The program can easily be audited, as it'll be maybe 50 lines of
>>> code...
>>> If the user switches VT, the keyboard needs to be unpatched. So this
>>> approach won't fully work. However, a solution that can work is  
>>> to make
>>> the keyboard unit execute a setuid root helper to which it  
>>> communicates
>>> through a pipe.
>> This would introduce quite some linux specific code on a lot of  
>> already
>> complicated points to the IDE.
> I'm not so sure - refreshing the keyboard and video status after  
> coming
> back from a spawned program or shell should be provided as a standard
> functionality within InitKeyboard and InitVideo calls, shouldn't it?

Last time i tried I was not able to get the state the terminal is in,  
for example white on black or black on white. Consequently, you can  
only reset it to its default state, when you are done, which  might  
be different from what is was before you started.

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