code: func GetCSIEndpointListener() (net.Listener, error) {
  	proto, addr, err := GetCSIEndpoint()
  	if err != nil {
  		return nil, err
  	}
  	return net.Listen(proto, addr)
  }
docs: // GetCSIEndpointListener returns the net.Listener for the endpoint
  // specified by the environment variable CSI_ENDPOINT.