On Fri, 3 Nov 2000, Jeffrey Goldberg wrote:
> On Fri, 3 Nov 2000, The Flying Hamster wrote:
>
> > abusing other peopleOne thought is to
>
> > [...] use the exim msg ID as a unique key, which naturally brings up
> > the question "is it unique"
>
> The ID that exim adds will be unique if
> (a) You never set your machines clock back in time
> (b) You do not have two instances of exim running on the same host.
> (c) You aren't running on exim on multiple hosts which think that
> they have the same name.
>
> Now that I think about it, I actually don't know how exim actually
> enforces unique IDs. Since multiple users could call /path/to/exim -t at
> the same time, and I don't know how these processes would know about each
> other. So I am not fully confident about what I've said.
>
I think probably, upon generating an ID, it probably attempts to open
the spool file with only the 'CREATE' flag set, so if it cant
exclusively be the process that creates the file with that ID, it can
recycle and try again. If it doesnt do this, it certainly could (or
do something similar)
> -j
>
>
--
