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WSARecvDisconnect
The Windows Sockets WSARecvDisconnect function terminates reception on a socket, and retrieves the disconnect data
if the socket is connection oriented.
int WSARecvDisconnect (
SOCKET s,
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| LPWSABUF lpInboundDisconnectData
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| );
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Parameters
s
[in] A descriptor identifying a socket.
lpInboundDisconnectData
[out] A pointer to the incoming disconnect data.
Remarks
WSARecvDisconnect is used on connection-oriented sockets to disable reception, and retrieve any
incoming disconnect data from the remote party.
After this function has been successfully issued, subsequent receives on the
socket will be disallowed. This has no effect on the lower protocol layers. For
TCP, the TCP window is not changed and incoming data will be accepted (but not
acknowledged) until the window is exhausted. For UDP, incoming datagrams are
accepted and queued. In no case will an ICMP error packet be generated.
To successfully receive incoming disconnect data, an application must use
other mechanisms to determine that the circuit has been closed. For example, an
application needs to receive an FD_CLOSE notification, or get a zero return value,
or a WSAEDISCON or WSAECONNRESET error code from recv/WSARecv.
Note that WSARecvDisconnect does not close the socket, and resources attached to the socket will not be
freed until closesocket is invoked.
Comments
WSARecvDisconnect 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 WSARecvDisconnected. 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, WSARecvDisconnect 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.
| WSAEFAULT
| The buffer referenced by the parameter lpInboundDisconnectData is too small.
| WSAENOPROTOOPT
| The disconnect data is not supported by the indicated protocol family.
| 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.
|
See Also
connect, socket
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