Writing Unix Device Drivers
Order (or just read more about) Writing Unix Device Drivers from Amazon.com
This is five years old now, but it's hard to find good books on
this subject, and particularly hard to find references to SCO.
This book does reference SCO (though 3.2v4.2), and has enough
examples to get you started.
Why would you want to do this? Most of us have no pressing need
to write driver code. But understanding how such code
actually is written can teach you quite a bit, and make otherwise
incomprehensible problems in someone else's driver easier to
identify, at least.
Sometimes the exercise can even be useful. I once had a
combination of a particular computer and printer that just did not
work well, for no apparent reason. Both my budget and my general
stubbornness rebelled against just accepting that and buying
something else, so I set out to write a printer driver that would
help me find the problem.
That driver is discussed here in my Device Drivers article, but the
really interesting thing was that I never got to use the debugging
features because for reasons I still don't understand, the printer
immediately began working perfectly with the new driver!
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