| Platform SDK: Windows Sockets |
The socket IOCTL opcodes for Windows Sockets 2 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 | Meaning |
|---|---|---|---|
| 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. |
| SIOCATMARK | <Not used> | BOOL | Determines whether or not all OOB data has been read. |
| SIO_ASSOCIATE_HANDLE | Companion API dependent | <Not used> | Associates the socket with the specified handle of a companion interface. |
| SIO_ENABLE_CIRCULAR _QUEUEING |
<Not used> | <Not used> | Enables circular queuing. |
| SIO_FIND_ROUTE | SOCKADDR structure | <Not used> | Requests the route to the specified address to be discovered. |
| SIO_FLUSH | <Not used> | <Not used> | Discards current contents of the sending queue. |
| SIO_GET_BROADCAST _ADDRESS |
<Not used> | SOCKADDR structure | Retrieves the protocol-specific broadcast address to be used in WSPSendTo. |
| SIO_GET_QOS | <Not used> | QOS | Retrieves current flow specification(s) for the socket. |
| SIO_GET_GROUP_QOS | <Not used> | QOS | Reserved. |
| 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_SET_QOS | QOS | <Not used> | Establishes new flow specification(s) for the socket. |
| SIO_SET_GROUP_QOS | QOS | <Not used> | Reserved. |
| SIO_TRANSLATE_HANDLE | int | Companion-API dependent | Obtains a corresponding handle for socket s that is valid in the context of a companion interface. |
| 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 |
| SIO_QUERY_PNP_TARGET_HANDLE | <Not used> | SOCKET | Obtains socket descriptor of the next provider in the chain on which current socket depends in regards to PnP. |