SunOS 4.0 - tty??/cua? troubles

[Nick Sayer]

I have a Sun 2/170 with a standard Hayes compatable modem. I have two
/dev entries for the tty port it resides on, /dev/ttym0 and /dev/cua0.
In the nutshell UUCP book, it says that if I put ttym0 in /etc/ttytab
and /dev/cua0 in /etc/uucp/L-devices that three things will happen:

1. getty will not show up on the tty until a carrier appears.

2. anyone opening /dev/cua0 will steal the line and getty won't show up
until that line is closed.

3. If anyone is on /dev/ttym0, /dev/cua0 will be "busy."

As it turns out, this is happening:

1. getty shows up the instant the line is enabled. I can watch as the modem's
echoing creates the deadly embrace with getty.

2. If I kill the getty process and quickly open /dev/cua0, getty is shut
out, as it should be.

3. Since getty is having an echoing war on /dev/ttym0, /dev/cua0 is always
"busy" unless I turn off its entry in /etc/ttytab.

So the big problem as I see it is to get it so that DTR will be on, but no
getty will appear until DCD comes on (or DSR). RTFM didn't help.

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