Function get_persistent_socket

src/process.cpp:1713–1716

Tests can declare this function and use it to fetch the socket FD's for links managed by the `SocketManager`. Without explicitly declaring this function, it is not visible. This is the preferred behavior as we do not want applications to have easy access to managed FD's.

// behavior as we do not want applications to have easy access to
// managed FD's.
Option<int_fd> get_persistent_socket(const UPID& to)
{
  return socket_manager->get_persistent_socket(to);
}


Option<int_fd> SocketManager::get_persistent_socket(const UPID& to)