Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site lsuc.UUCP
Path: utzoo!utcs!lsuc!dave
From: dave@lsuc.UUCP (David Sherman)
Newsgroups: net.bugs.uucp
Subject: Re: Read permission on /etc/phones
Message-ID: <721@lsuc.UUCP>
Date: Fri, 19-Jul-85 13:18:06 EDT
Article-I.D.: lsuc.721
Posted: Fri Jul 19 13:18:06 1985
Date-Received: Fri, 19-Jul-85 14:53:21 EDT
Reply-To: dave@lsuc.UUCP (David Sherman)
Organization: Law Society of Upper Canada, Toronto
Lines: 38
Keywords: tip, uucp, LCK

References:<472@qantel.UUCP> <170@motel6.UUCP> <154@telesoft.UUCP> <696@lsuc.UUCP> <697@lsuc.UUCP> <1953@ukma.UUCP>

In article <1953@ukma.UUCP> david@ukma.UUCP (David Herron, NPR Lover) writes:
> In article <697@lsuc.UUCP> dave@lsuc.UUCP (David Sherman) writes:
> >||Why not just write a simple set-UID program which removes
> >||the LCK file and nothing else? You can get fancy with various
> >||checks, of course, but in its simplest form it's a one-line
> >||C program.
> >
> >Whoops, I forgot one thing. You want this done automatically
> >when tip exits. So move tip to /usr/lib and make tip a shell
> >file which reads
> >	trap '/usr/lib/cleanLCK' 0 1 2 3 9 15
> >	/usr/lib/tip $*
> 
> How does this solve anything?   I don't see where this removes the 
> lock file.
> 
> 1)	cleanLCK isn't called explicitly, only on a signal, which
> 	won't happen.
> 2)	cleanLCK *cannot* know which lock file to delete.

(1) Notice the trap on 0. That will pick up the case of normal exit,
    on at least some implementations of UNIX. Of course, you can
    put another "/usr/lib/cleanLCK" after the call to tip.

(2) As I SAID, you can get fancier. This version assumes you have only
    one dialout line, so the file to delete is LCK..cul0 or whatever.
    If you have several, just pass $* to cleanLCK and have it parse
    the args to tip to figure out which line should be unlocked.

> Answer me one question, why are we discussing tip problems in net.bugs.uucp?

Because that's where the discussion began, because the discussion will
be short-lived, and because it's still related to UUCP, since that's
where the LCK file goes.

Dave Sherman
-- 
{  ihnp4!utzoo  pesnta  utcs  hcr  decvax!utcsri  }  !lsuc!dave