Info needed on pseudo TTYs in SysV

[Brian Lloyd]

> Actually, the way the System V terminal driver is set up, it is
> designed to help you do this.  Unfortunately, it means driver
> hacking, and you really do need a UNIX source license.  If you
> can find one, look at the xt.c driver for running the BLITs and
> tty5620 terminals, it is switching a packetized input stream
> consisting of six virtual terminals into separate xt000 devices.
> 
> System V doesn't really have pty's at all.  The SXT (which are VR2
> anyhow) devices are a kludged up version of the code for the xt
> driver.  What they do is switch a single real tty line back and
> forth between a set of virtual terminals.  Doing this, they achieve
> something roughly equivelent to the 4.2 Job control.  The difference
> is that you actually have a shell on each of the sxt virtual devices.
> What you are really doing is switching your real tty to several virtual
> tty "contexts."
> 
> -Ron

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