Upon successful completion, the mrd_lock(3mrd) function returns the value MRD_STATUS_SUCCESS. If the mrd_lock(3mrd) fails the returned status value may be set to one of the following values. Other values that correspond to specific SCSI errors may also be possible, but these are the most likely.
MRD_STATUS_PARAM MRD_STATUS_ROBOT_ILLEGAL_REQUEST MRD_STATUS_ROBOT_COMM_ERROR