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SubjectRe: Signalling from kernel
Date
> 
> is there a simple way to call an user-level funktion from kernel space
> or at least let the process notify that a driver completed a task.
>

I think this is a job for SIGIO: use SIGIO to notify the process
something just happened and have the process read from a character
device to find out just exactly what the SIGIO was about.

That is, of course, assuming the process can't simply select() on a
suitable device until something happens.

-hpa

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