Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
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Path: utzoo!linus!decvax!mulga!munnari!basservax!chris
From: chris@basservax.SUN
Newsgroups: net.unix-wizards
Subject: Re: un-dedicating a line to a dialer
Message-ID: <209@basservax.SUN>
Date: Thu, 5-Jan-84 13:27:10 EST
Article-I.D.: basserva.209
Posted: Thu Jan  5 13:27:10 1984
Date-Received: Fri, 6-Jan-84 02:20:37 EST
References: <15002@sri-arpa.UUCP>
Organization: Dept of C.S., University of Sydney
Lines: 6

The solution is to have the dialler program open the dial
line with O_EXCL, which will return an error if a getty or login
still has the line open.

If you have signalled init, it is about to hangup the line anyway,
so uucico just needs to wait until its exclusive open returns.