Removes @socket from the multicast group defined by @group, @iface,
and @source_specific (which must all have the same values they had
when you joined the group).
@socket remains bound to its address and port, and can still receive
unicast messages after calling this.
Removes @socket from the multicast group defined by @group, @iface, and @source_specific (which must all have the same values they had when you joined the group).
@socket remains bound to its address and port, and can still receive unicast messages after calling this.