The Windows Sockets specification provides a number of extensions to the standard set of Berkeley Sockets routines. Principally, these extended functions allow message or function-based, asynchronous access to network events, as well as enable overlapped I/O. While use of this extended API set is not mandatory for socket-based programming (with the exception of WSAStartup and WSACleanup), it is recommended for conformance with the Microsoft Windows programming paradigm. For features introduced in Windows Sockets 2, please see New Concepts, Additions and Changes for Windows Sockets 2.
| WSAAccept1 | An extended version of accept which allows for conditional acceptance and socket grouping. | |
| WSAAsyncGetHostByAddr2 3 | A set of functions which provide asynchronous versions of the standard Berkeley getXbyY functions. For example, the WSAAsyncGetHostByName function provides an asynchronous, message-based implementation of the standard Berkeley gethostbyname function. | |
| WSAAsyncSelect 3 | Perform asynchronous version of select | |
| WSACancelAsyncRequest2 3 | Cancel an outstanding instance of a WSAAsyncGetXByY function. | |
| WSACleanup | Sign off from the underlying Windows Sockets DLL. | |
| WSACloseEvent | Destroys an event object. | |
| WSAConnect1 | An extended version of connect which allows for exchange of connect data and QOS specification. | |
| WSACreateEvent | Creates an event object. | |
| WSADuplicateSocket | Allow an underlying socket to be shared by creating a virtual socket. | |
| WSAEnumNetworkEvents | Discover occurrences of network events. | |
| WSAEnumProtocols | Retrieve information about each available protocol. | |
| WSAEventSelect | Associate network events with an event object. | |
| WSAGetLastError 3 | Obtain details of last Windows Sockets error | |
| WSAGetOverlappedResult | Get completion status of overlapped operation. | |
| WSAGetQOSByName | Supply QOS parameters based on a well-known service name. | |
| WSAHtonl | Extended version of htonl | |
| WSAHtons | Extended version of htons | |
| WSAIoctl1 | Overlapped-capable version of ioctl | |
| WSAJoinLeaf1 | Add a multipoint leaf to a multipoint session | |
| WSANtohl | Extended version of ntohl | |
| WSANtohs | Extended version of ntohs | |
| WSAProviderConfigChange | Receive notifications of service providers being installed/removed. | |
| WSARecv1 | An extended version of recv which accommodates scatter/gather I/O, overlapped sockets and provides the flags parameter as IN OUT | |
| WSARecvFrom1 | An extended version of recvfrom which accommodates scatter/gather I/O, overlapped sockets and provides the flags parameter as IN OUT | |
| WSAResetEvent | Resets an event object. | |
| WSASend1 | An extended version of send which accommodates scatter/gather I/O and overlapped sockets | |
| WSASendTo1 | An extended version of sendto which accommodates scatter/gather I/O and overlapped sockets | |
| WSASetEvent | Sets an event object. | |
| WSASetLastError 3 | Set the error to be returned by a subsequent WSAGetLastError | |
| WSASocket | An extended version of socket which takes a WSAPROTOCOL_INFO struct as input and allows overlapped sockets to be created. Also allows socket groups to be formed. | |
| WSAStartup 3 | Initialize the underlying Windows Sockets DLL. | |
| WSAWaitForMultipleEvents1 | Blocks on multiple event objects. | |
| 1 The routine can block if acting on a blocking socket. 2 The routine is always realized by the name resolution provider associated with the default TCP/IP service provider, if any. 3 The routine was originally a Windows Sockets 1.1 function |
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