Hi, I am writing a small application to watch for xenstore events. I want to know when a specific domain shutdown or reboot. It is best to watch it via xenbus interface, but how? Is there any event or node can give me such an event? If not, I must periodically scan the domains (using libxc interface) to detect if a domain dies, but that is not as good as xenbus approach. Many thanks. Hieu _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
On 9/10/05, NAHieu <nahieu@gmail.com> wrote:> I am writing a small application to watch for xenstore events. I want > to know when a specific domain shutdown or reboot. It is best to watch > it via xenbus interface, but how? Is there any event or node can give > me such an event?You can have a watch on @releaseDomain, the watch will fire whenever xenstored unmaps the store page it has mapped from the domain. There''s also @introduceDomain for when xenstored maps the page after the domain was created.> If not, I must periodically scan the domains (using libxc interface) > to detect if a domain dies, but that is not as good as xenbus > approach.Yeah, polling is definitely not the way to go ;-) christian _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
On Sun, 2005-09-11 at 00:53 +0100, Christian Limpach wrote:> On 9/10/05, NAHieu <nahieu@gmail.com> wrote: > > I am writing a small application to watch for xenstore events. I want > > to know when a specific domain shutdown or reboot. It is best to watch > > it via xenbus interface, but how? Is there any event or node can give > > me such an event? > > You can have a watch on @releaseDomain, the watch will fire whenever > xenstored unmaps the store page it has mapped from the domain. > There''s also @introduceDomain for when xenstored maps the page after > the domain was created.Speaking of which, I have a patch which changes over introduce/release to a write/rm in /tool/xenstored/domain/<id>, so this will combine nicely, too. (Part of the patch series to make xenstored restartable). This is probably more generically useful, and avoids turning xenstored into an event mechanism 8) Cheers, Rusty. -- A bad analogy is like a leaky screwdriver -- Richard Braakman _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel