[libvirt] Using callback under Windows compiling of libvirtlibrary

[Dev.Atom]

I have implemented the virEventRegisterImpl as in domain-event.c, I have the 
unmarshalled msg and another info :

libvir: QEMU error : remoteDomainProcessEvent: unmarshalling msg
libvir: Remote error : unknown program (received 54657374, expected 
20008086)

Any clue ?

Best regards,

Arnaud

--------------------------------------------------
From: "Dev.Atom" <arnaud.champion at devatom.fr>
Sent: Thursday, March 18, 2010 12:20 PM
To: "Matthias Bolte" <matthias.bolte at googlemail.com>
Cc: <libvir-list at redhat.com>
Subject: Re: [libvirt] Using callback under Windows compiling of 
libvirtlibrary

> I use libportablexdr 4.9.1 from the web site you indicate. I have compile 
> it without any problem using the mingwin fedora environment (I have 
> compile all under this environment), I haven't modified anything in the 
> source, a simple configure like this :
>
> ./configure --host=i686-pc-mingw32 --prefix=/usr/i686-pc-mingw32/sys-root/mingw/
>
> then, make and make install, nothing else.
>
> Can explain me or point me on an explaination for registering 
> event-handling please ?
>
> --------------------------------------------------
> From: "Matthias Bolte" <matthias.bolte at googlemail.com>
> Sent: Thursday, March 18, 2010 11:39 AM
> To: "Dev.Atom" <arnaud.champion at devatom.fr>
> Cc: <libvir-list at redhat.com>
> Subject: Re: [libvirt] Using callback under Windows compiling of libvirt 
> library
>
>> 2010/3/18 Dev.Atom <arnaud.champion at devatom.fr>:
>>> Hi,
>>>
>>> I have compiled LibVirt 0.7.4 under mingw, and I want to use it with 
>>> domain
>>> callback. Here is a a code sample of my situation (I'm using visual 
>>> studio)
>>
>> Did you compile it on Windows, or cross-compile it from Linux?
>>
>>>
>>> static
>>>
>>> int domain_event(virConnectPtr conn,
>>>
>>> virDomainPtr dom,
>>>
>>> int evt,
>>>
>>> int detail,
>>>
>>> void *opaque)
>>>
>>> {
>>>
>>> bool test = true;
>>>
>>> return 0;
>>>
>>> }
>>>
>>> int
>>>
>>> _tmain(int argc, _TCHAR* argv[])
>>>
>>> {
>>>
>>> virConnectPtr conn = virConnectOpen(
>>>
>>> "qemu+tcp://192.168.220.198/session");
>>>
>>> // Set Callback
>>>
>>> int cbresult = virConnectDomainEventRegister(conn, domain_event, NULL,
>>> NULL);
>>>
>>> // Lookup Domain
>>>
>>> virDomainPtr dom = virDomainLookupByName(conn,
>>>
>>> "Test1");
>>>
>>> if (virDomainIsActive(dom) == 1)
>>>
>>> {
>>>
>>> // Start Domain
>>>
>>> int startDom = virDomainCreate(dom);
>>>
>>> if (startDom != 0)
>>>
>>> {
>>>
>>> virErrorPtr e = virGetLastError();
>>>
>>> bool test = true;
>>>
>>> }
>>>
>>> }
>>>
>>> else
>>>
>>> {
>>>
>>> // Stop Domain
>>>
>>> int StopDom = virDomainDestroy(dom);
>>>
>>> if (StopDom != 0)
>>>
>>> {
>>>
>>> virErrorPtr e = virGetLastError();
>>>
>>> bool test = true;
>>>
>>> }
>>>
>>> }
>>>
>>> return 0;
>>>
>>> }
>>
>> This code is incomplete, you're missing the event-handling, see the
>> virEventRegisterImpl function.
>>
>> Have you tried the domain-event example yet? See
>> examples/domain-events/events-c/event-test.c in the libvirt codebase.
>>
>>>
>>> This code works well when I did'nt use callbacks, but when I use it, it
>>> throw an error at the virDomainCreate or virDomainDestroy call. In the
>>> application windows (console) I have an "unmarshaling msg", I have study 
>>> the
>>> case it comme from the call of "xdr_string" method in the
>>> "xdr_remote_nonull_string" method (remote_protocol.c).
>>>
>>> I think, the xdr_string method is unable to marshall strings from the 
>>> XDR*
>>> object to a char**.
>>>
>>
>> Where did you get your XDR lib from? I'm using libportablexdr [1]
>> version 4.9.1 on Windows, but had to patch it to get it compile
>> correctly with MinGW.
>>
>> This may be a bug in your XDR lib, or may be a problem in the way
>> libvirt uses XDR, or it's just a symptom of that fact that you try to
>> use domain events without registering event-handling first.
>>
>> [1] http://people.redhat.com/~rjones/portablexdr/
>>
>> Matthias
>
>
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