IOCTL error codes

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The following codes and their descriptions apply to IOCTL operations.
[EINVAL]
The operation that is requested has invalid parameters or an invalid combination of parameters.

This error code also results if the IOCTL is not supported for the device.

[EWRPROTECT]
An operation that modifies the media was attempted on a write-protected tape or a device opened with the O_RDONLY flag.
[EIO]
An I/O error occurred during the operation. Perform the failure analysis.
[ECANCELLED]
The STIOCTOP IOCTL with the st_op field that specifies STERASE_IMM was canceled by another process that issued the STIOC_CANCEL_ERASE IOCTL.