The wait command will pause the monitor the command was issued in until a new
event becomes available. Events are queued if there isn't a waiter present.
The wait command completes after a single event is available.
Today, we queue events indefinitely but in the future, I suspect we'll drop
events that are older than a certain amount of time to avoid infinitely
allocating memory for long running VMs.
To make use of the new notification mechanism, this patch introduces a
qemu_notify_event() API. This API takes three parameters: a class which is
meant to classify the type of event being generated, a name which is meant to
distinguish which event in the class that has been generated, and a details
parameters which is meant to allow events to send arbitrary data with a given
event.
v1->v2
- Added a -d flag to poll for events instead of waiting
- Made old events expire after 10 minutes