Re: [gdm-list] Help How to kill instance of ext process launched from gdm

[Brian Cameron <Brian Cameron Sun COM>]

Francesco:

Why not include the $DISPLAY value in the name of the PID file.  This
way you would be sure that each pid file was differentiated by display.

Brian


> I know how to start an external onscreen keyboard by using the 
> dwelling feature of the accessibility in onboard; and it works. (I am 
> starting an onscreen keyboard named onboard, that is shipped by 
> default with the Ubuntu-distribution; I am not talking about gok 
> here, though I don't think it would make a difference for my problem.)
>
> However I would also like to be able to quit the onscreen keyboard. 
> So instead of making the dwell feature call the onscreen keyboard, it 
> calls a script that does the following each time it is called:
> - if the onscreen keyboard is not running yet, it starts it and 
> places the pid of the onscreen keyboard in a file in /tmp
> - if it is already running it kills the onscreen keyboard by using 
> the pid stored in the pid file created when the onscreen keyboard was 
> started; then it removes the pid file
>
> Based on the existence of the pid file, the script can check whether 
> the onscreen keyboard is already running and what instance to kill. 
> This is working all working well on my single user computer.
>
>
>
> Now to the problem:
>
> It also has to work on computers with multiple users. But the file 
> with the pid does not differentiate from what gdm-session it was 
> created. Consequently, if two users at two different gdm-sessions 
> start onboard, there will be the problem that the two instances of 
> the script will check for the same pid file.
>
> Could anybody please tell me how I can make a pid file specific for 
> each session?
>
> Maybe there is a better way than using a pid file in order to make 
> each gdm-session know the pid of the instance of the onscreen 
> keyboard started in it.
>
>
>
> Many thanks in advance.
>
> Francesco
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