Path: utzoo!attcan!uunet!prcrs!paul
From: paul@prcrs.UUCP (Paul Hite)
Newsgroups: comp.sys.hp
Subject: Re: Modems
Message-ID: <935@prcrs.UUCP>
Date: 5 Jul 90 15:12:03 GMT
References: <1990Jun13.153719.17110@groucho> <560012@hpqtdla.HP.COM> <1131@kcdev.UUCP>
Organization: PRC Realty Systems, McLean, VA
Lines: 31

In article <1131@kcdev.UUCP>, gentry@kcdev.UUCP (Art Gentry) writes:
> I missed the original discussion, so this may have already been discussed,
> but it sounds suspiciously like you have 'getty' instead of 'uugetty'
> spawned on the port.  getty does not know how to handle 2 way traffic
> gracefully.
> 

We had trouble getting two way traffic to work, so we contacted the Response
Center.  We were using uugetty, but they told us that uugetty is not intended
for use with modems on HP-UX.  This doesn't jive with what we know from other
platforms, but we followed the advice anyway and we have two traffic working
with just getty.  The Response Center told us that uugetty is intended only
for use with hard-wired links.  We did not have a special file correctly set
up and the Responce Center also found that.  I suspect that once the special
file was correct, we really could have gone back to uugetty on the modem port,
but we want to do things HP's way.

We asked for an explanation of how cu, uucp, and getty avoid colliding with
each other.  getty opens the callin special file and blocks waiting for 
carrier detect.  If cu or getty want the port, they open the callout special
file which doesn't block.  They will cause cd to be raised, but getty's
open will then fail because it wants exclusive access.  cu and uucp (uucico)
never interfer with each other because of lock files.

Anyway, we are using getty on a two-way modem port and the Response Center
did say that uugetty should not be used on a modem port.  I would be
interested in hearing a lab type confirm (or deny) that this is the official 
HP line.

Paul Hite   PRC Realty Systems  McLean,Va   uunet!prcrs!paul    (703) 556-2243
                      DOS is a four letter word!