Opening tape devices under LynxOS

[Richard Jordan_1]

Help !

I'm developing an application that performs raw write/read operations using standard ioctl() calls (to transfer SCSI command block data)under LynxOS 3.0.1. to a HP DAT40i drive. However, I cannot open the device unless a tape is inserted. The device can then be opened for write/read using the standard 'open("/dev/rtape3", O_RDWR, 0)' command.

I would have expected to be able to open the device without a tape being inserted and then I could get a check condition or mode sense and then detect that there is no tape present.

Similarly if a tape is write protected then the device can only be opened in read only mode (O_RDONLY).

Is this a limitiation in LynxOS/Unix or is this a setup/configuration/limitiation of the DAT drive ?

Thanks,
Rcihard.

[Brice_5]

I'm not familiar with LynxOS. Do you have poll() in LynxOS?

[Richard Jordan_1]

Yes