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The socket IOCTL opcodes for Winsock are summarized in the following table. More detailed information is provided in section 4 under WSPIoctl. There are other new protocol-specific IOCTL opcodes that can be found in the protocol-specific annex.
| Opcode | Input type | Output type | Description |
|---|---|---|---|
| FIONBIO | Unsigned long | <Not used> | Enables or disables nonblocking mode on the socket. |
| FIONREAD | <Not used> | Unsigned long | Determines the amount of data that can be read atomically from the socket. |
| SIO_GET_BROADCAST_ADDRESS | <Not used> | sockaddr | Retrieves the protocol-specific broadcast address to be used in WSPSendTo. |
| SIO_MULTIPOINT_LOOKBACK | BOOL | <Not used> | Controls 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> | Specifies the scope over which multicast transmissions will occur. |
| SIO_ROUTING_INTERFACE_QUERY | sockaddr | sockaddr | Obtains the address of the local interface that should be used to send to the specified address. |
| SIO_ROUTING_INTERFACE_CHANGE | sockaddr | <Not used> | Requests notification of changes in information reported through SIO_ROUTING_INTERFACE_QUERY for the specified address. |
| SIO_ADDRESS_LIST_QUERY | <Not used> | SOCKET_ADDRESS_LIST | Obtains the list of addresses to which the application can bind. |
| SIO_ADDRESS_LIST_CHANGE | <Not used> | <Not used> | Requests notification of changes in information reported through SIO_ADDRESS_LIST_QUERY. |
See Also
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