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Date:      Wed, 25 Aug 1999 06:05:11 -0400 (EDT)
From:      Thomas David Rivers <rivers@dignus.com>
To:        bee@wipinfo.soft.net, hackers@FreeBSD.ORG
Subject:   RE: Mandatory locking?
Message-ID:  <199908251005.GAA95394@lakes.dignus.com>
In-Reply-To: <000301beeea6$1ea898a0$88291fac@wipro.tcpn.com>

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> All the files under Tandem's NSK has mandatory locking. The file cannot be
> opened if another process has it opened. some thing like
> 
>   * if the file is opened for reading, any one can open it for
>     reading but opening for writing gives error
>   * if the file is open for writing, it can't be opened for
>     read/write
>   * if the process holding the file is killed, the lock is gone
>   * it is possible to get the pid of the process(es) which has
>     a given file open (like which process has file "xyz" open?
>     kind of query). btw, is there any way to get this info now in FBSD?

 This sounds interesting...
 
 But - aren't there NFS issues?  I mean, in stateless access to
 a file - how do you know if the process holding the file is killed
 if it's remote?

 Just curious...

	- Dave Rivers -


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