3.2.5.40.2 Receiving an NT_TRANSACT_IOCTL Response

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If the response indicates that an error occurred, the client MUST propagate the error to the application that initiated the call. The response MAY be a complete NT_TRANSACT_IOCTL response, including the results of the IOCTL call that generated the error.

In any case, the client MUST return the information received in the NT_Trans_Data.Data block of the response to the application that initiated the call. The application MUST interpret the results of the IOCTL call. CIFS does not specify IOCTL functions; IOCTLs are platform-, device-, and implementation-specific.