WSASendDisconnect

The Windows Sockets WSASendDisconnect function initiates termination of the connection for the socket and sends disconnect data.

int WSASendDisconnect (

SOCKET s,
LPWSABUF lpOUT boundDisconnectData
);

Parameters
s

[in] A descriptor identifying a socket.

lpOutboundDisconnectData

[in] A pointer to the outgoing disconnect data.

Remarks
WSASendDisconnect is used on connection-oriented sockets to disable transmission, and to initiate termination of the connection along with the transmission of disconnect data, if any.

After this function has been successfully issued, subsequent sends are disallowed.

lpOutboundDisconnectData, if not NULL, points to a buffer containing the outgoing disconnect data to be sent to the remote party for retrieval by using WSARecvDisconnect.

Note that WSASendDisconnect does not close the socket, and resources attached to the socket will not be freed until closesocket is invoked.

Comments
WSASendDisconnect does not block regardless of the SO_LINGER setting on the socket.

An application should not rely on being able to re-use a socket after it has been WSASendDisconnected. In particular, a Windows Sockets provider is not required to support the use of connect/WSAConnect on such a socket.

Return Values
If no error occurs, WSASendDisconnect returns zero. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code may be retrieved by calling WSAGetLastError.

Error Codes

WSANOTINITIALISED	A successful WSAStartup must occur before using this function.
WSAENETDOWN	The network subsystem has failed.
WSAENOPROTOOPT	The parameter lpOutboundDisconnectData is not NULL, and the disconnect data is not supported by the service provider.
WSAEINPROGRESS	A blocking Windows Sockets 1.1 call is in progress, or the service provider is still processing a callback function.
WSAENOTCONN	The socket is not connected (connection-oriented sockets only).
WSAENOTSOCK	The descriptor is not a socket.
WSAEFAULT	The lpOutboundDisconnectData argument is not totally contained in a valid part of the user address space.