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The SUB_CAN_SEND/SUB_CAN_RECV enum values have been confusing a few times, especially when checking them on reading. After some discussion, it appears that calling them SUB_RETRY_SEND/SUB_RETRY_RECV more accurately reflects their purpose since these events may only appear after a first attempt to perform the I/O operation has failed or was not completed. In addition the wait_reason field in struct wait_event which carries them makes one think that a single reason may happen at once while it is in fact a set of events. Since the struct is called wait_event it makes sense that this field is called "events" to indicate it's the list of events we're subscribed to. Last, the values for SUB_RETRY_RECV/SEND were swapped so that value 1 corresponds to recv and 2 to send, as is done almost everywhere else in the code an in the shutdown() call.