8.26. SCSI_IOCTL_SEND_COMMAND

   struct sdata {
    unsigned int inlen;     [i] Length of data written to device
    unsigned int outlen;    [i] Length of data read from device
    unsigned char cmd[x];   [i] SCSI command (6 <= x <= 16)
                            [o] Data read from device starts here
                            [o] On error, sense buffer starts here
    unsigned char wdata[y]; [i] Data written to device starts here
   };