Date: 24 Aug 1999 12:38:38 +0300 From: Ville-Pertti Keinonen <will@iki.fi> To: John-Mark Gurney <gurney_j@resnet.uoregon.edu> Cc: hackers@freebsd.org, grog@lemis.com Subject: Re: Mandatory locking? Message-ID: <86pv0djz6o.fsf@not.demophon.com> In-Reply-To: gurney_j@efn.org's message of "24 Aug 1999 12:22:48 %2B0300" References: <19990823223645.A14001@netmonger.net> <19990824021431.55023@hydrogen.fircrest.net>
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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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