UUCP Port Turnaround

[paul at vixie.UUCP]

In article <7717 at utzoo.UUCP> henry at utzoo.UUCP (Henry Spencer) writes:
>As testimony to the simplicity and appeal of the technique, it was invented
>independently in at least four different places.

Are any of those four available to the public?  I'm currently editing
/etc/ttys on the fly and sending HUP signals to init -- I'd prefer to
have it in the driver.  I have driver source, but not kernel source.
-- 
Paul A. Vixie        {ptsfa, crash, winfree}!vixie!paul
329 Noe Street       dual!ptsfa!vixie!paul at ucbvax.Berkeley.EDU
San Francisco        
CA  94116            paul at vixie.UUCP     (415) 864-7013