Ultrix 3.1C uucp will not dial a LAT terminal modem

[Ian! D. Allen [CGL]]

Oh, LAT ttys don't support TIOCCDTR or TIOCSDTR either:

    /dev/tty55 TIOCCDTR: Not a typewriter
    /dev/tty55 TIOCSDTR: Not a typewriter
    /dev/tty55 TIOCMODEM: Not a typewriter
    /dev/tty55 TIOCWONLINE: Not a typewriter

So it looks like you can't use an Ultrix LAT tty in any application where
your program wants to manipulate or know about modem control signals.
This makes "shared" in/out LAT lines impossible under Ultrix, doesn't it?

Ultrix 3.1C uucp/tip don't check the return status of their ioctl calls, so
they just fail silently.

Why isn't this deficiency in BIG BOLD LETTERS in the LAT documentation,
the lta(4) man page, and the tty(4) man page?  Aaargh what a waste of time.
-- 
-IAN! (Ian! D. Allen) idallen at watcgl.uwaterloo.ca idallen at watcgl.waterloo.edu
 [129.97.128.64]  Computer Graphics Lab/University of Waterloo/Ontario/Canada