Indy 9
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lpfn_WSAIOCTL = function ( const s : TSocket; dwIoControlCode : DWORD; lpvInBuffer : Pointer; cbInBuffer : DWORD; lpvOutBuffer : Pointer; cbOutBuffer : DWORD; lpcbBytesReturned : LPDWORD; lpOverlapped : LPwsaoverlapped; lpCompletionRoutine : LPwsaoverlapped_COMPLETION_ROUTINE ) : Integer;