[libvirt] Raising events for testing

arnaud.champion at devatom.fr arnaud.champion at devatom.fr
Sun Jan 30 12:21:37 UTC 2011


Hi,

One thing I need to understand, in the callback python or c samples, the 
fileDescriptor is on a socket or on a pipe ?

Regards,

Arnaud

--------------------------------------------------
From: <arnaud.champion at devatom.fr>
Sent: Saturday, January 29, 2011 2:03 PM
To: "Daniel P. Berrange" <berrange at redhat.com>
Cc: <libvir-list at redhat.com>
Subject: Re: [libvirt] Raising events for testing

> 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 at devatom.fr>
> Sent: Friday, January 28, 2011 7:06 PM
> To: "Daniel P. Berrange" <berrange at redhat.com>
> Cc: <libvir-list at 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 at devatom.fr>
>> Sent: Friday, January 28, 2011 4:53 PM
>> To: "Daniel P. Berrange" <berrange at redhat.com>
>> Cc: <libvir-list at redhat.com>
>> Subject: Re: [libvirt] Raising events for testing
>>
>>> Woohoo it will burn my brain :)
>>>
>>> --------------------------------------------------
>>> From: "Daniel P. Berrange" <berrange at redhat.com>
>>> Sent: Friday, January 28, 2011 4:24 PM
>>> To: <arnaud.champion at devatom.fr>
>>> Cc: <libvir-list at redhat.com>
>>> Subject: Re: [libvirt] Raising events for testing
>>>
>>>> On Fri, Jan 28, 2011 at 04:17:21PM +0100, arnaud.champion at 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
>>>>
>>>
>>> --
>>> libvir-list mailing list
>>> libvir-list at redhat.com
>>> https://www.redhat.com/mailman/listinfo/libvir-list
>>
>>
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>
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