From owner-freebsd-hackers  Tue Aug 24  2:39:13 1999
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To: John-Mark Gurney <gurney_j@resnet.uoregon.edu>
Cc: hackers@freebsd.org, grog@lemis.com
Subject: Re: Mandatory locking?
References: <19990823223645.A14001@netmonger.net> <19990824021431.55023@hydrogen.fircrest.net>
From: Ville-Pertti Keinonen <will@iki.fi>
Date: 24 Aug 1999 12:38:38 +0300
In-Reply-To: gurney_j@efn.org's message of "24 Aug 1999 12:22:48 +0300"
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gurney_j@efn.org (John-Mark Gurney) writes:

> Ville-Pertti Keinonen scribbled this message on Aug 24:

> >     cat writes part of oldmail to /var/mail/grog
> >     sendmail locks /var/mail/grog
> >     (cat may try to write more to /var/mail/grog but blocks)
> >     sendmail delivers new mail
> >     sendmail unlocks /var/mail/grog
> >     cat writes the rest of oldmail to /var/mail/grog
> > 
> > You'll still probably end up with a broken mailbox.
> 
> what you do is this:
> lockf -k $mailfile cat ${mailtmp} >> $mailfile

Which doesn't support Greg's arguments for mandatory locking, as
you're now doing locking in both programs.


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