Method check

src/linux/routing/link/link.cpp:178–193

private:
  void check()
  {
    Try<bool> exists = link::exists(link);
    if (exists.isError()) {
      promise.fail(exists.error());
      terminate(self());
      return;
    } else if (!exists.get()) {
      promise.set(Nothing());
      terminate(self());
      return;
    }

    // Perform the check again.
    delay(Milliseconds(100), self(), &Self::check);
  }

  const string link;
  Promise<Nothing> promise;