Enable ZEO log rotation

[Mark Hammond]

Currently ZEO ignores SIGUSR2 signals, which was in the past used for log rotation (Zope still does use that signal).

I'm attaching a patch that should give ZEO the same log rotation capabilities as Zope. Sadly I'm not in a position to test linux, but it *should* work <wink>. It works for Windows. Only tested under a ZEO that runs next to a Zope (ie, not in stand-alone ZODB, whatever that means :)

[Sidnei da Silva (sidnei)]

FWIW, I've just tested the patch on linux and it works great with a ZEO instance created by './bin/mkzeoinstance.py' from a Zope 2.8 checkout.

[Hanno Schlichting (hannosch)]

In 143786 it's also noted that "zeoctl logreopen" doesn't do anything.

[Jim Fulton (jim-zope)]

http://svn.zope.org/?rev=116788&view=rev

Thanks for the patch. I wrote a test for Unix. See
runzeo_logrotate_on_sigusr2 in ZEO.tests.testZEO.

It would be great if someone wrote a test for windows or updated the
test to work on windows.

How does one even send a signal on windows? (And, if we can't, then
why register a signal handler?)