Input Event Handling

Tiago Vignatti vignatti at
Wed Apr 4 07:42:47 PDT 2007

Thorsten Wilms escreveu:
> Hi!
> I'm working on a concept that deals with mapping user input device 
> events to actions. For this it would be better to know how input 
> events are handled currently. Searched for a while, even had a look 
> at the ICCCM but failed to get anything out of it.
> I initialy though it would be roughly like this:
> device -> driver->kernel -> userspace
> If X is running:
> device -> driver->kernel -> x-server -> WM -> app that has focus
> Where events can be interpreted and not passed on on every level.
> In a random IRC channel I have been told that events are not passed 
> through the WM. But how can the WM intercept shortcuts, then?
> With further thinking, input focus might happen on 3 levels:
> widget, window, application. Right?
> If I hit Alt-F1 to switch to the first console, is that shortcut 
> interpreted by the kernel or the x-server?
> Does the x-server anything special to receive all input events?
> Does the kernel have a concept like input focus?
> So please enlighten me about what way input events take, where 
> they can be intercepted (shortcuts) and how input focus is 
> structured.

There is a great documentation in xorg wiki which could help you:

> --
> Thorsten Wilms


Tiago Vignatti
C3SL - Centro de Computação Científica e Software Livre

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