> Date: Thu, 05 Jan 1995 23:26:21 -0500
> From: Ken Hornstein <kenh@entropic.com>

> "Six months ago I couldn't even spell 'device driver programmer': now I is
> one!" :-)
> 
> Seriously, if you're a reasonably competent C programmer, it's not impossible
> to write a device driver.  You have to be willing to do some work [...]

One should also study a book on UNIX device drivers, particularly to
learn about how data structures are shared beween user context and
interrupt context, with atomic access assured using spl*()/splx()
around the use-context access code.