TTY Inquiry

[Chris Torek]

> One approach that can be taken to allow bi-directional use
> of tty lines is to have 2 minor #'s for each physical port.

We use two major device numbers, but the basic idea is the same.

> ...  attempts to open the other mode fail with EBUSY.

Personally, I think that our approach (making normal `incoming'
opens simply suspend until the outgoing call has completed) is
better.

> The changes that need to made are relatively minor (but are
> unfortunately proprietary code, so I can't post them).

But I can post ours, and I have done so in the past.
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 4251)
UUCP:	seismo!umcp-cs!chris
CSNet:	chris at umcp-cs		ARPA:	chris at mimsy.umd.edu