Peek
Returns the next queue entry without removing it from the queue.
Declaration
kern_return_t Peek(IODataQueueClientDequeueEntryBlock callback);Parameters
- callback:
The callback you use to examine the next entry in the queue.
Return Value
kIOReturnSuccess on success, kIOReturnUnderrun if the queue is empty, or kIOReturnError if the queue is corrupt. See Error Codes.