Windows Sockets Direct Extensions

A SAN service provider DLL implements the Windows Sockets Direct extension functions to extend Windows Sockets SPI for use with a system area network (SAN).

Note   These Windows Sockets Direct extension functions are defined in Ws2san.h and require Windows Sockets version 2.2.

To support the Windows Sockets switch, a SAN service provider must implement all these extension functions (except the optional WSPRdmaReadand WSPMemoryRegistrationCacheCallbackfunctions). If a SAN service provider does not support either the WSPRdmaReador WSPMemoryRegistrationCacheCallbackextension function, its WSPIoctlfunction must return the WSAEOPNOTSUPP error code after the switch requests a pointer to WSPRdmaReador WSPMemoryRegistrationCacheCallback.

See the following topics for more information about the Windows Sockets Direct extension functions:

WSPDeregisterMemory

WSPDeregisterRdmaMemory

WSPMemoryRegistrationCacheCallback

WSPRdmaRead

WSPRdmaWrite

WSPRegisterMemory

WSPRegisterRdmaMemory

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