On Mon, 11 Sep 2000, Jeremy C. Reed wrote:
> On Mon, 11 Sep 2000, Trevor Sky Garside wrote:
>
> > How does Exim handle the case where it tries to run appendfile on a file
> > that is locked by the filesystem?
>
> I am not sure of the perfect or correct way. But creating a user.lock file
> in the mail spool (or whatever you want to call it) directory is the
> standard.
I didn't answer correctly. .lock is not the standard for MTAs just common
for pop3 servers. You may also want to look at how procmail does its
locking.
> In addition, you can use fcntl(2) to create a shared lock. Depending on
> how it used, I am not sure if this locks the whole file or if it locks a
> portion. Also, I am not sure if you are supposed to save the current
> setting (F_SETLK) so you can restore it.
Jeremy C. Reed
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