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From: mcgillis@sol.UUCP
Newsgroups: comp.unix.wizards
Subject: ioctl exclusive locks under bsd 4.2
Message-ID: <199@fomalhaut.sol.SPS.TRW.COM>
Date: Thu, 2-Apr-87 19:07:58 EST
Article-I.D.: fomalhau.199
Posted: Thu Apr  2 19:07:58 1987
Date-Received: Sun, 5-Apr-87 01:05:57 EST
Reply-To: mcgillis@sol.UUCP (Jack McGillis)
Distribution: na
Organization: TRW Inc., Redondo Beach, CA
Lines: 16

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We are using ioctl (TIOCEXCL, TIOCNXCL) to get exclusive locks on 
terminal lines.  A problem arises when the process with the lock
dies (or is killed for daily backups).  The lock remains in place
until we either reboot or do the following:

		edit the tty entry (add getty)
		kill -HUP 1 (init)
		edit the tty entry (remove getty)
		fill -HUP 1 (init again)

Does anyone know of a better way ?  Is this a bug in bsd 4.2 ?


			Thank you in advance,

			        Jack