Function SocketFD_ZERO() Professional
Resets an existing descriptor set to its initial state.
SocketFD_ZERO( <nFDSet>, [@<nError>] ) --> lSuccess
The function returns .T. (true) when the descriptor set could be reset, otherwise .F. (false) is returned.
The function removes all sockets form a descriptor set so that an empty set is available, being in the same state as if it were created with SocketFDSetNew().
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