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			Enum etc.c.curl.member CurlOption.opensocketfunction
			 Callback function for opening socket (instead of socket(2)). Optionally,
     callback is able change the address or refuse to connect returning
     CURL_SOCKET_BAD.  The callback should have type
     curl_opensocket_callback
Declaration
enum CurlOption { // ... opensocketfunction = 20163, // ... }