On 28.06.19 21:22, Ian Zimmerman wrote:
> I happen to know that procmail tries to lock the file in _all_ the ways
> available on the system, for instance on Linux with a dotlock temporary
> file, with flock, and with fcntl.  This is a bit overkill but it means
> procmail is safe to use as long as the other program accessing the
> mailbox uses any locking at all.

And nine years ago, on 09.08.10 15:37, Michael Elkins wrote:
> On Mon, Aug 09, 2010 at 11:26:07PM +0100, Chris G wrote:
> > 
> > but does that mean that to co-operate with mutt another process *has*
> > to use dotlock and fcntl?  ... and, if so, what order should one do
> > things in?
> dotlock first, then fcntl.  realize that these are just advisory locks,
> which means other processes might not obey them.  mutt is conservative and
> uses multiple methods since there is no standard.
> me

So, looking from the other side also, it appears that both are respected.


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