Required SCSI Adapter Device Driver ioctl Commands

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Various ioctl operations must be performed for proper operation of the SCSI adapter device driver. The ioctl operations described here are the minimum set of commands the SCSI adapter device driver must implement to support SCSI device drivers.

Other operations might be required in the SCSI adapter device driver to support, for example, system management facilities and diagnostics. SCSI device driver writers also need to understand these ioctl operations.

Every SCSI adapter device driver must support the IOCINFO ioctl operation. The structure to be returned to the caller is the devinfo structure, including the scsi union definition for the SCSI adapter, which can be found in the /usr/include/sys/devinfo.h file. The SCSI device driver should request the IOCINFO ioctl operation (probably during its open routine) to get the maximum transfer size of the adapter.

Note: The SCSI adapter device driver ioctl operations can only be called from the process level. They cannot be run from a call on any more favored priority levels. Attempting to call them from a more favored priority level can result in a system crash.