On May 9, 2014, at 1:31 PM, erik quanstrom <quans...@quanstro.net> wrote:

> the question is interesting, but i don't know the answer.
> i don't know the origin of u.h, either.

"The Design and Implementation of the 4.[X] Operating System" books (for X in 3 
and 4) describe this in great detail.  While not directly related to Plan9, 
they are required reading for anyone wanting to understand the legacy of the 
UNIX kernel(s).

--lyndon

P.S.  abebooks.com :-)

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