Matrix of Winsock Supported Functions

The following tables list the functions of the Winsock API that are supported by the TCP/IP Stack. All functions can work with either IPv4 or IPv6 addresses unless otherwise mentioned. The address family values that are currently supported are AF_INT or AF_INT6, which are the internet address family formats for IPv4 and IPv6.

The Winsock API is divided into 2 primary APIs: BSD and Winsock Extensions. The BSD group is Microsoft's version of the Berkeley Standard API. The Winsock extensions are additional APIs developed by Microsoft to further enhance the functionality of the protocol stack, particularly in the area of asynchronous notification of network events. The enhanced functionality provided by the Winsock extensions is not guaranteed to be deterministic. It is recommended that applications be developed using the BSD API rather than the Winsock Extensions. Winsock extensions are easy to identify by their WSA prefix.

Note: Some options for some functions are not supported. Unsupported options are listed in the Remarks section for those functions.

Note: APIs that are not explicitly documented as supported are not guaranteed to work. You should thoroughly test any code that uses undocumented functions.

Winsock BSD (deterministic)

Winsock BSD API	Description
accept	Returns a new socket that corresponds to an established connection from the listening socket queue.
bind	Assigns a local name to an unnamed socket.
closesocket	Removes a socket from the per-process object reference table. Only blocks if SO_LINGER is set with a nonzero timeout on a blocking socket.
connect	Initiates a connection on the specified socket.
freeaddrinfo	Frees address info returned by a call to freeaddrinfo.
getaddrinfo	Provides protocol-independent translation from a hostname to an IP address.
gethostname	Returns an ASCII string representation of the first IPv4 address configured on a system.
getnameinfo	Provides name resolution from an address to the hostname.
getpeername	Retrieves the name of the peer connected to the specified socket.
getsockname	Retrieves the local address to which the specified socket is bound.
getsockopt	Retrieves options associated with the specified socket. wRTOS extends getsockopt with two additional options that apply at the IPPROTO_TCP level: TCP_ACKDELAYTIME The delay period (in milliseconds) that the stack uses for delayed acknowledgements (ACKs). A value of zero indicates that delayed ACKs are disabled (that is, all data segments are acknowledged immediately). Default value is 200. TCP_ACKNSEG Acknowledgement frequency, configured to every Nth maximum-sized segment (MSS). The default for N is 2.
htonl	Converts a 32-bit quantity from host-byte order to network-byte order.
htons	Converts a 16-bit quantity from host-byte order to network-byte order.
inet_addr	Converts a character string representing a number in the Internet standard ".'' notation to an Internet address value.
inet_ntoa	Converts an Internet address value to an ASCII string in ".'' notation i.e., "a.b.c.d''.
inet_ntop	Converts an IPv4 or IPv6 Internet network address into a string in Internet standard format.
inet_pton	Converts an IPv4 or IPv6 Internet network address in its standard text presentation form into its numeric binary form.
ioctlsocket	Provides control for sockets.
listen	Listens for incoming connections on a specified socket.
ntohl	Converts a 32-bit quantity from network-byte order to host-byte order.
ntohs	Converts a 16-bit quantity from network byte order to host byte order.
recv	Receives data from a connected socket.
recvfrom	Receives data from either a connected or unconnected socket.
select	Performs synchronous I/O multiplexing.
send	Sends data to a connected socket.
sendto	Sends data to either a connected or unconnected socket.
setsockopt	Stores options associated with the specified socket. wRTOS extends setsockopt with two additional options that apply at the IPPROTO_TCP level: TCP_ACKDELAYTIME Specifies the delay period (in milliseconds) that the stack uses for delayed acknowledgements (ACKs). A value of zero disables delayed ACKs (that is, all data segments are acknowledged immediately). Default value is 200. TCP_ACKNSEG Acknowledgement frequency can be configured to every Nth maximum-sized segment (MSS) using this socket option. The default for N is 2.
shutdown	Shuts down part or all of a full-duplex connection.
socket	Creates an endpoint for communication and return a socket descriptor.

Winsock Extensions (non-deterministic)

Winsock Extensions	Description
WSAAccept	Returns a new socket that corresponds to an established connection from the listening socket queue.
WSACleanup	Terminates use of the Winsock 2 by RTSS process.
WSAConnect	Establishes a connection to a specified socket.
WSAFDIsSet	Checks whether a socket is included in set of socket descriptors
WSAGetLastError	Returns the error status for the last Windows Sockets operation that failed.
WSAHtonl	Converts a u_long IPv4 address in host byte order to TCP/IP network byte order.
WSAHtons	Converts a u_short IPv4 address in host byte order to TCP/IP network byte order.
WSAIoctl	Performs a protocol specific I/O control action on the socket in any state.
WSANtohl	Converts a u_long in TCP/IP network byte order to host byte order.
WSANtohs	Converts a u_short in TCP/IP network byte order to host byte order.
WSARecv	Receives data on a socket and returns the number of bytes received.
WSARecvDisconnect	Causes a socket to be closed for receiving.
WSARecvFrom	Receives a datagram on a socket and returns the number of bytes received.
WSASend	Transmits a message on a connected socket.
WSASendDisconnect	Causes a socket to be closed for sending.
WSASendTo	Transmits a message on a connected or unconnected socket.
WSASetLastError	Sets the error code which can be retrieved by WSAGetLastError call for the current thread.
WSASocket	Creates a socket and returns an integer descriptor. The operation of WSASocket is controlled by socket-level options that are defined. setsockopt and getsockopt functions are used to set and get options.
WSAStartup	Initiate use of the Winsock by an RTSS process.