NdisMAllocatePort - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// ndis.h
NDIS_STATUS NdisMAllocatePort(
NDIS_HANDLE NdisMiniportHandle,
[in, out] PNDIS_PORT_CHARACTERISTICS PortCharacteristics
);
View the official Windows Driver Kit DDI referenceNo description available.
The NdisMAllocatePort function allocates an NDIS port that is associated with a miniport adapter.
NdisMiniportHandleThe miniport adapter handle that NDIS passed to the MiniportAdapterHandle parameter of the MiniportInitializeEx function.
PortCharacteristics [in, out]A pointer to an NDIS_PORT_CHARACTERISTICS structure that defines the characteristics of the port.
NdisMAllocatePort can return one of the following values:
| Return code | Description |
|---|---|
| NDIS_STATUS_SUCCESS | NDIS successfully allocated resources for the port. |
| NDIS_STATUS_RESOURCES | NDIS could not allocate resources for the port. |
| NDIS_STATUS_CLOSING | The port allocation failed because the associated miniport adapter is closing. |
| NDIS_STATUS_INVALID_DATA | The data that was supplied at the PortCharacteristics parameter was invalid. |
The NdisMAllocatePort function allocates resources and a port number for a port that is associated with a miniport adapter. The port is not active until the miniport driver issues a NetEventPortActivation Plug and Play (PnP) event for the port.
After the miniport driver activates the port, NDIS generates a PnP notification for the overlying drivers. If an overlying driver or user-mode application issues the OID_GEN_ENUMERATE_PORTS OID to enumerate a miniport adapter's ports, NDIS does not include non-active allocated ports in the list of the ports.
When NdisMAllocatePort successfully returns, the PortNumber member of the NDIS_PORT_CHARACTERISTICS structure that the PortCharacteristics parameter specifies is set to the port number that NDIS assigned to the port.
After a port is no longer required, the miniport driver should call the NdisMFreePort function to free the port.