Re: [libvirt] PATCH: Change signature of virEventAddHandle to allow multiple calls per FD

As discussed previously, this patch changes the semantics of the public API for dealing with file handle watches. Previously we would track the watch based on the file handle number directly. With this change, the virEventAddHandle method returns an integer 'watch' number. This watch number is required when unregistering or updating a watch. The watch is also passed into the callback when an event occurrs. This allows for multiple watches to be registered against the same file descriptor. There was quite alot of fallout from this patch requiring many callers to be updated to comply with the new semantics.