[libvirt] [PATCH] libxl: Create per-domain log file

[Daniel P. Berrange]

On Fri, Aug 09, 2013 at 10:56:41AM -0600, Eric Blake wrote:
> On 08/09/2013 10:50 AM, Daniel P. Berrange wrote:
> 
> >> I should have looked at the xen code closer.  Seems libxl doesn't cope
> >> well with a NULL logger :(.
> >>
> >> Hmm, should the logger for this driver-wide ctx (used for getting libxl
> >> version and the like, no domain ops) just dump messages to /dev/null or
> >> should they go to a driver-wide log file?
> > 
> > Depends if you think there's any useful info to be had from the
> > driver wide context object ? If so, then probably best to have a
> > driver-wide log file for those messages
> 
> Or even just reply the data into the main libvirtd.log (ie. use existing
> virLog functionality, rather than creating a new file), since ideally
> the log will be relatively sparse: in my case, it would be just one
> message stating that libxl is not available, at which point the libxl
> driver no longer does anything else during the life of libvirtd.

I was going to suggest that, but IIUC, the libxl logger API requires
you to give it a FILE * instance to which it writes directly. To feed
it into our normal logs, we'd want it to let us give it a callback
for writing log messages.

Daniel
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