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The former sysconf and sysctl services are merged into the new core
control interface (corectl).

In addition to the pre-existing configuration retrieval requests, the
core "stop", "start" and "status" actions are available. Those
requests can be issued by the new corectl utility, for shutting down,
(re-)starting, and getting the current status of the real-time
services respectively.

RTDM drivers can define state management operation handlers, for being
notified of transitions from running to stopped state, and conversely
(see rtdm_driver.smops).