Okay I have understand the use and mean of poll (pollfd... bla...bla...bla...) I have also discover that there is no Win32 equivalent which work with a file descriptor (unix way...). Win32 has a select method that can be used to emulate the poll function, but the fd_set structure is base on socket and not on a file descriptor. Does anyone know a way to have a select or poll function that works with file descriptor under windows ? (maybe via mingw, I don't know) Regards, Arnaud -------------------------------------------------- From: <arnaud.champion@devatom.fr> Sent: Friday, January 28, 2011 7:06 PM To: "Daniel P. Berrange" <berrange@redhat.com> Cc: <libvir-list@redhat.com> Subject: Re: [libvirt] Raising events for testing
Okay, I'm trying to understand the Python implentation (I'm not a python expert but it seems to be quite readable once you've understand why there is "self" everywhere :) ). The thing I'm not able to understand is the call to the "poll" function as this function doesn't exists in C# in any library at my knows... I'm not fluent with this. Anyone can expliain what poll do ?
Regards
Arnaud
-------------------------------------------------- From: <arnaud.champion@devatom.fr> Sent: Friday, January 28, 2011 4:53 PM To: "Daniel P. Berrange" <berrange@redhat.com> Cc: <libvir-list@redhat.com> Subject: Re: [libvirt] Raising events for testing
Woohoo it will burn my brain :)
-------------------------------------------------- From: "Daniel P. Berrange" <berrange@redhat.com> Sent: Friday, January 28, 2011 4:24 PM To: <arnaud.champion@devatom.fr> Cc: <libvir-list@redhat.com> Subject: Re: [libvirt] Raising events for testing
On Fri, Jan 28, 2011 at 04:17:21PM +0100, arnaud.champion@devatom.fr wrote:
I suffer with the new callback API :)
Does the new callback API need the EventRegisterImpl call ?
Yes, virEventRegisterImpl is required in order to be able to receive events.
Can anyone explain me the steps to install these callbacks ? I have a lot of difficulties to understand the polling process in the sample, does this polling is mandatory ?
Events can arrive at the client socket from libvirtd at any time. The poll() is used to watch for events arriving and ensure immediate dispatch. If we didn't do this no events would be seen until the next API call was made which is sub-optimal.
The file daemon/events.c shows a complete C implementation of the event callbacks.
The file examples/domain-events/events-python/domain-events.py shows a pure Python implementation
The C example program is a very *bad* demo of poll() so ignore that and look at daemon/events.c instead.
Daniel
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