Summary of New Socket Ioctl Opcodes

The new socket ioctl opcodes for Windows Sockets 2 are summarized in the following table. See WSAIoctl for detailed information on these opcodes. The WSAIoctl function also supports all the ioctl opcodes specified in ioctlsocket. Theother new protocol-specific ioctl opcodes can be found in the Protocol-specific Annex (a separate document included with the Win32 SDK).

Opcode	Input Type	Output Type	Meaning
SIO_ASSOCIATE _HANDLE	companion API dependent	<not used>	Associate the socket with the specified handle of a companion interface.
SIO_ENABLE _CIRCULAR _QUEUEING	<not used>	<not used>	Circular queuing is enabled.
SIO_FIND_ROUTE	struct sockaddr	<not used>	Request the route to the specified address to be discovered.
SIO_FLUSH	<not used>	<not used>	Discard current contents of the sending queue.
SIO_GET _BROADCAST _ADDRESS	<not used>	struct sockaddr	Retrieve the protocol-specific broadcast address to be used in sendto/WSASendTo.
SIO_GET_QOS	<not used>	QOS	Retrieve current flow specification(s) for the socket.
SIO_GET_GROUP _QOS	<not used>	QOS	Retrieve current group flow specification(s) for the group this socket belongs to.
SIO_MULTIPOINT _LOOKBACK	BOOL	<not used>	Control whether data sent in a multipoint session will also be received by the same socket on the local host.
SIO_MULTICAST _SCOPE	int	<not used>	Specify the scope over which multicast transmissions will occur.
SIO_SET_QOS	QOS	<not used>	Establish new flow specification(s) for the socket.
SIO_SET_GROUP _QOS	QOS	<not used>	Establish new group flow specification(s) for the group this socket belongs to.
SIO_TRANSLATE _HANDLE	int	companion API dependent	Obtain a corresponding handle for socket s that is valid in the context of a companion interface.

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