I would like to write a simple device for NetBSD (1.2 at the moment).
This device would be opened by a userland program.  It would read a
few bytes of information from an I/O card and return them to the
userland program.  It might also receive small commands from the userland
program.

Where can I look for examples?  Are LKM devices much more complex than
the "normal" ones?  What if the device needs so CPU attention every now
and then - can I hook it to some clock interrupt to get some minor tasks
done?

This device, once (if ever :) completed, will probably be interesting to
other NetBSD users as well..

Thanks a lot,

  -jm

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                       1503 kHz @ 22:30 EET DST Mon-Fri

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