enum enDeviceIOErrors { IOERR_SUCCESS = ( 0), /* no error */ IOERR_OPENFAIL = (-1), /* device/unit failed to open */ IOERR_ABORTED = (-2), /* request terminated early [after AbortIO()] */ IOERR_NOCMD = (-3), /* command not supported by device */ IOERR_BADLENGTH = (-4), /* not a valid length (usually IO_LENGTH) */ IOERR_BADADDRESS = (-5), /* invalid address (misaligned or bad range) */ IOERR_UNITBUSY = (-6), /* device opens ok, but requested unit is busy */ IOERR_SELFTEST = (-7) /* hardware failed self-test */ };