LockPort hangs the application if port is unusable

[yusufozturk]

If the default port 2978 is not available on the system, then LockPort stucks in infinite for loop.

leakless/leakless.go

Lines 131 to 138 in 9bcba10

	for {
	var err error
	l, err = net.Listen("tcp", fmt.Sprintf(":%d", port))
	if err == nil {
	break
	}
	time.Sleep(time.Duration(rand.Intn(100)) * time.Millisecond)
	}

In my case, I keep getting:
listen tcp 127.0.0.1:2978: bind: An attempt was made to access a socket in a way forbidden by its access permissions.

This is a problem with Windows. It reserves and blocks the ports if you have Docker or Hyper-V. But this port might be also in use by system. So it would be better to return an error, so users can understand why the application is hanged.

Maybe a try limit would be also good. For example try to listen port 3 times and then return error if it doesn't work. Or maybe allow an ability to switch automatically to .Leakless(false) for go-rod. (I'm not sure about this)

Edit: Oh I see, you use this port for cross-process locking. I'm not sure in this case. Maybe we can check returned error.

[ysmood]

Agree, we should at least provide a timeout for this function, could you help to make a PR for it?