## Input/Output Device Driver Reference

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### Read Timeout State

When the physical device driver processes a READ request packet, it can be with Normal, No-Wait, or Wait-For-Something Timeout processing. With Normal Timeout processing, if no data is received in the specified period of time, the request is completed. With No-Wait Timeout processing, the request obtains whatever data is available in the physical device driver receive queue (at the time the request is processed by the device driver) and returns. With Wait-For-Something Timeout processing, the request acts like No-Wait Timeout processing. However, if no data is available when the device driver processes the request, the physical device driver waits until some data is available or until the request times out due to Normal Timeout processing.

Initial Value Normal Read Timeout processing
First Level Open The device driver is set to Normal Read Timeout processing
Mode Utility No effect