From owner-freebsd-hackers@FreeBSD.ORG  Thu Mar 31 13:16:48 2005
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Date: Thu, 31 Mar 2005 08:16:42 -0500
From: David Schultz <das@FreeBSD.ORG>
To: Christoph Hellwig <hch@infradead.org>
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On Thu, Mar 31, 2005, Christoph Hellwig wrote:
> On Thu, Mar 31, 2005 at 07:20:13AM -0500, David Schultz wrote:
> > On Wed, Mar 30, 2005, David Leimbach wrote:
> > > > Yes, procfs rules!
> > > 
> > > Procfs is from linux?
> > > 
> > > I thought it was from Plan 9... along with rfork :).
> > 
> > Nope.  It was first implemented by Sun's Roger Faulkner in SVR4,
> > well before Linux or Plan 9 existed.  Actually, someone wrote a
> > prototype for Unix years earlier than raf, but I don't remember
> > who.
> 
> procfs comes from v8 (research) unix, a direct predecessor of Plan 9,
> way before SVR4.

That's the prototype I was talking about, but I believe it was not
an official part of version 8 (to the extent that anything was).
It certainly never made it to System V.  Do you recall who wrote the
prototype?