Parameters | cfSocket | The CFSocket which has got some activity. |
| callbackType | The type of activity that we are being notified of. Either kCFSocketReadCallBack or kCFSocketWriteCallBack . |
| ignoredAddress | Unused, because this is not used for either of the callback types we register for. |
| ignoredData | Unused, because this is not used for either of the callback types we register for. |
| context | The data associated with this callback by CFSocketCreateWithNative (in CFReactor._watchFD ). A 2-tuple of (int, CFRunLoopSource) . |