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pfnWaitReceiveAvail  ,
(PPDMINETWORKPORT pInterface, unsigned cMillies)   

Wait until there is space for receiving data. We do not care how much space is available because pfnReceive() will re-check and notify the guest if necessary.

This function must be called before the pfnRecieve() method is called.

VBox status code. VINF_SUCCESS means there is at least one receive descriptor available.
pInterface Pointer to the interface structure containing the called function pointer.
cMillies Number of milliseconds to wait. 0 means return immediately.

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