DispatchSource.VnodeMonitor Class

var stream = File.Create ("Demo.txt");

// Get the underlying Unix file descriptor
var safeHandle = stream.SafeFileHandle;
IntPtr descriptor = safeHandle.DangerousGetHandle ();
int fileDescriptor = descriptor.ToInt32 ();

var dispatchSource = new DispatchSource.VnodeMonitor (
    fileDescriptor,
    VnodeMonitorKind.Delete | VnodeMonitorKind.Extend | VnodeMonitorKind.Write,
    DispatchQueue.MainQueue
);

dispatchSource.SetRegistrationHandler (() => {
    Console.WriteLine ("Vnode monitor registered");
});

dispatchSource.SetEventHandler (() => {
    var observedEvents = dispatchSource.ObservedEvents;
    Console.WriteLine ("Vnode monitor event for file: {0}", observedEvents);
    dispatchSource.Cancel ();
    stream.Close ();
});

dispatchSource.SetCancelHandler (() => {
    Console.WriteLine (textView, "Vnode monitor cancelled");
});

dispatchSource.Resume ();