[Zope] How to rotate the Z2.log log file

[smoerk@gmx.de]

>> How could I rotate the Z2.log log file?
>
>Manually.  The software does not yet support log rotation.  of course
>you could impliment this functionality and send us a patch. ;)

I don't want that Zope does it for me, and a cron job is fine, but I
don't know how I could do it. If I rename the file, ZServer doesn't
create a new one, but uses the renamed (Apache does the same). But
restarting Zope is not a solution, too. Any ideas?

Oliver