Leaving of a Coordinator(leave process)

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This is not a RPC process but it acts as RPC client for the local coordinator.
If any coordinator in the ARC ring leaves the ring or fails, other coordinators must
be notified about this so that they can reform the ring and remove the node that
has failed/left from the ring.
Here we discuss the case when a coodinator wants to leave the ring.
Whenever the co-ordinator leaves the ARC ring, following steps are executed from within the main() function:
 

• The leave process creates a handle to its local coordinator.
• It then calls the RPC function leave_system(CLIENT *cl) where cl is the newly created client handle.