See Also
 Important: |
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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. |