Re: [Xen-devel] using @releaseDomain to subscribe for domain destruction

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2013-02-14 at 13:18 +0000, Vasiliy Tolstov wrote:
> Hello!. How can i use @releaseDomain from dom0 to subscribe for domain
> destruction?
> I'm try to add watch for @releaseDomain path with token equal of
> needed domain id. But when another domain dies, i get domain that i
> provide via token to xs_watch.

The token is an opaque cookie which xenstore simply echoes back at you
so you can identify which of your watches is firing if you have more
than one. It doesn't have any meaning other than that.

> Is that possible to get id of domain what released from xenstore?

Not directly, @releaseDomain just tells you that *a* domain died, you
need to check if it was the one which interested you.

libxl has some infrastructure for maintaining this state and firing
events on specific domain death. depending on your use case this may or
may not be overkill for your application.

Ian.




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