Not really a Cocoa question, and it's answered in the docs on
IOServiceAddMatchingNotification :)
"The notification is armed when the iterator is emptied by calls
to IOIteratorNext - when no more objects are returned, the
notification is armed. Note that the notification is not armed when
first created."
IOServiceAddMatchingNotification(...);
CFRunLoopAddSource(...);
while (IOIteratorNext(deviceAppearedIterator));
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