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Re: [libvirt-users] Event&Callback in QEMU



On Fri, Nov 04, 2011 at 11:42:00AM +0800, huachao yao wrote:
> Hi buddy,
> I wanna to monitor a domain's life cycle event, so i register a event an a
> 
> virConnectDomainEventCallback, the code segment is as below:
> 
> ------------------------
> int DomainEventCallback(virConnectPtr conn,
> 			virDomainPtr dom,
> 			int event,
> 			int detail,
> 		        void * opaque){
> 	/*My code */
>        .......
> }
> 
> int main(){
> 
>   /* .....*/
>    virDomainPtr dom = domain.getDomains("xp");
>    virFreeCallback	freecb    = NULL;
>    void *opaque	=NULL;
>    virConnectDomainEventCallback cb	=DomainEventCallback;
>    virConnectDomainEventRegisterAny(conn, dom,
> VIR_DOMAIN_EVENT_ID_LIFECYCLE,
> VIR_DOMAIN_EVENT_CALLBACK(cb),opaque,freecb);
>   /* .....*/
> }
> 
> but such a error happened:
> libvir: Remote error : this function is not supported by the
> connection driver: no event support
> 
> and the libvirt version is 0.9; the driver is QEMU-KVM ,version is 0.14.0.
> 
> I want to know why this Error will happen? Is the QEMU not support the
> LIFECYCLE Event ? If it is , how can i monitor the domain's life cycle
> event( such as started,defined and stopped..)

This means you have not registered any event loop implementation.

Take a look at examples/domain-events/events-c/event-test.c for a
good example of how to deal with the events APIs.

Daniel
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