>   c) in a few rare instances, uses curproc.

> I dont see how any of these can be called ``a random proc pointer''.

My guess is that c, the one I quoted above, is the one intended.  In
interrupt context, curproc is "a random proc pointer" a sense of
`random' that, in terms of the Jargon File entry for "random", is a mix
of senses 1, 2, and 6, with a dash of something akin to 5 thrown in.
To save people the bother of going to look them up:

   1. Unpredictable (closest to mathematical definition); weird. "The
   system's been behaving pretty randomly."                    

   2. Assorted; undistinguished. "Who was at the conference?" "Just a
   bunch of random business types."

   5. In no particular order, though deterministic. "The I/O channels are
   in a pool, and when a file is opened one is chosen randomly."

   6. Arbitrary. "It generates a random name for the scratch file."

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