getting timestamp of last interrupt?

[Hans-Georg Thien]

I am looking for a possibility to read out the last timestamp when an 
interrupt has occured.

e.g.: the user presses a key on the keyboard. Where can I read out the 
timestamp of this event?

To be more precise, I 'm looking for

( )a function call
( ) a callback where I can register to be notified when an event occurs
( ) a global accessible variable
( ) a /proc entry

or something like that.

Any ideas ?

- Hans


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