[Zope-Coders] Signal handling

[Chris McDonough]

This is excellent, much cleaner, many thanks!

On Fri, 2002-06-14 at 12:02, Brian Lloyd wrote:
> > I have some products that have their own log files, and it would 
> > be nice to 
> > reopen those on a USR2 too. 
> > 
> > Any objections to the patch in http://collector.zope.org/Zope/430 ?
> 
> It seems like it would be good for this to be a more 
> generalized facility, rather than adding more funny 
> magic globals.
> 
> So I went ahead and did it :)
> 
> Chris, I refactored it so that the sig handling code 
> that was in z2.py is now encapsulated in a singleton 
> in a new module: SignalHandler.py.
> 
> The way it works now, the "standard" signal handlers 
> that were in z2 are guaranteed to run, but users can 
> now use the registerHander method to add handlers for 
> given signals. For example:
> 
> from SignalHandler import SignalHandler
> import signal
> 
> def mySigUsr2Handler():
>   print 'hi, Im the SIGUSR2 handler!'
> 
> SignalHandler.registerHandler(signal.SIGUSR2, mySigUsr2Handler)
> 
> 
> The only caveat is that for now you are restricted to 
> SIGINT, SIGTERM, SIGUSR2 and SIGHUP. That's because 
> of the way that signal pass-through is hooked up to 
> zdaemon. The SignalHandler singleton can deal with 
> any kind of signal, so if we ever care to figure this 
> out we'll just need to revisit the way that zdaemon is 
> notified of pass-through signals.
> 
> 
> 
> Brian Lloyd        brian@zope.com
> V.P. Engineering   540.361.1716       
> Zope Corporation   http://www.zope.com
> 
> 
> 
> 
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