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From: jns@fernwood.mpk.ca.US (Jerry Sweet)
Newsgroups: comp.sys.mips
Subject: Re: uugetty and /usr/spool/locks (another try)
Message-ID: <9101150643.AA26295@fernwood.mpk.ca.us>
Date: 15 Jan 91 06:49:33 GMT
Lines: 55
In-Reply-To: Your message of 15 Jan 91 00:59:50 +0000.


I made another attempt to make uugetty do its step-aside thing, using
a different modem, a Telebit T1600 this time.  Using the RS232
breakout box, I verified that the behavior of DCD is correct: the
modem only turns on DCD when there is actually carrier present.
Unfortunately, uugetty is still exhibiting the same behavior: it won't
step aside either for kermit or for tip.  Tip reports "all ports
busy".  Kermit just sits there when you try to "set line".  When I
disable uugetty on the port, kermit and tip are able to get through
with no trouble.  Uugetty otherwise exhibits exemplary standard getty
behavior vis a vis login when it's enabled.

If another experiment is suggested that might make uugetty do the
right thing, I'll give it a try.  (I haven't yet tried using the
RISC/os 4.30 version of uugetty, as Laurence Yaffe suggested in
his response to me in comp.sys.mips.)

Here's the setup (some recap):

This is being run on an RS3230 with RISC/os 4.51.

The modem (DCE) is connected via a MIPS-supplied "RJ45"(*)-to-DB25
cable to a MIPS-supplied 16-port DigiBoard (DTE).

The T1600 is set to run with proper DCD behavior (&C1 - assert DCD
only when carrier is actually present) and to use RTS/CTS hardware
flow control (S58=2, S68=255).

The gettydef line being used with the inittab entry is:

tbplus.19200# B19200 RTSCTS HUPCL # B19200 SANE RTSCTS TAB3 HUPCL #\r\n\nlogin: #tbplus.19200

Based on my reading of termio(7) and gettydefs(4), I believe that the
absence of CLOCAL here is equivalent to stty -clocal, unless SANE
turns it on.  (What exactly does SANE turn on and off, anyway?)

The inittab line is:

d0:234:respawn:/usr/lib/uucp/uugetty -r -t 60 ttyd0 tbplus.19200 none LDISC2 ;# TB+ in/out

The device, /dev/ttyd0, is set up this way:

crw--w--w-  1 uucp     other     32,   0 Jan 14 22:04 /dev/ttyd0

If you're wondering how I got kermit to work with this configuration,
I wrote a short and nasty little program that execs to kermit while
setuid to uucp.  Tip, of course, is already setuid to uucp.

(*) Just thought I'd mention that the 10-pin modular connector to
which MIPS refers as "RJ45" in its documentation does NOT appear to
correspond to what the rest of the world calls RJ45: everyone else is
using the term "RJ45" to refer to 8-pin modular connectors.
Alternative local sources for ten pin modular connectors haven't yet
made themselves apparent to me.  I bought the MIPS cable, so there's
presumably no question about the cable.