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Path: utzoo!watmath!clyde!cbosgd!ihnp4!inuxc!pur-ee!uiucdcs!okstate.UUCP!ea.UUCP!steve
From: steve@ea.UUCP
Newsgroups: net.micro.att
Subject: Re: Orphaned Response
Message-ID: <74700009@ea.UUCP>
Date: Thu, 27-Mar-86 23:08:00 EST
Article-I.D.: ea.74700009
Posted: Thu Mar 27 23:08:00 1986
Date-Received: Wed, 2-Apr-86 00:43:18 EST
References: <1545@caip.RUTGERS.EDU>
Lines: 16
Nf-ID: #R:caip.RUTGERS.EDU:1545:ea.UUCP:74700009:000:846
Nf-From: ea.UUCP!steve    Mar 27 22:08:00 1986


There are 2 approaches to this problem. The first and most straightforward
is to wire a jumper on the modem cable to a lead which is always asserted
high on the modem and then to carrier detect. This should succeed in faking
out the 3b. Unfortunately, since UNIX systems use CD to determine whether
or not a device is present, you may have problems with the modem being hung
up, but not getting a hangup signal sent to the process on the line. The
second approach is to acquire the source code for the kernel and change the
code dealing with this in tty.c. This is a sure fix for the problem but you
must pay $1000 for the privilege (assuming you get an academic license). I
have used both. Fortunately, most smart modems have an option to hold CD
high.

  Steve Blasingame (Oklahoma City)
  ihnp4!attmail!sblasingame
  ihnp4!cuuxb!glmnhh!bsteve