Function SocketFDSetNew() Professional

Creates a new descriptor set for sockets.

SocketFDSetNew( [@<nError>] ) --> nFDSet
If this parameter is passed by reference to the function, it gets assigned a numeric error code when the function fails. #define constants beginning with WSAE are available in the file SOCKET.CH to identify an error condition.

The function renurns a numeric handle for the new descriptor set or 0 in case of an error.


If an application uses multiple sockets (multiplexing I/O requests), it may group the sockets in descriptor sets. A descriptor set is similar to an array holding multiple sockets, but is identified via a numeric handle returned from SocketFDSetNew(). This handle must be used for all SocketFD..() functions. Once a new descriptor set is created, sockets are added to it using the function SocketFD_SET(). The readiness of individual sockets contained in the descriptor set to read/write messages is then checked with the SocketSelect() function.

When a descriptor set is no longer needed in an application, its resources must be released by calling the SocketFDSetDelete() function.


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