code: func (s *podDisruptionBudgetLister) GetPodPodDisruptionBudgets(pod *v1.Pod) ([]*policy.PodDisruptionBudget, error) {
  	var selector labels.Selector
  
  	if len(pod.Labels) == 0 {
  		return nil, fmt.Errorf("no PodDisruptionBudgets found for pod %v because it has no labels", pod.Name)
  	}
  
  	list, err := s.PodDisruptionBudgets(pod.Namespace).List(labels.Everything())
  	if err != nil {
  		return nil, err
  	}
  
  	var pdbList []*policy.PodDisruptionBudget
  	for i := range list {
  		pdb := list[i]
  		selector, err = metav1.LabelSelectorAsSelector(pdb.Spec.Selector)
  		if err != nil {
  			klog.Warningf("invalid selector: %v", err)
  			// TODO(mml): add an event to the PDB
  			continue
  		}
  
  		// If a PDB with a nil or empty selector creeps in, it should match nothing, not everything.
  		if selector.Empty() || !selector.Matches(labels.Set(pod.Labels)) {
  			continue
  		}
  		pdbList = append(pdbList, pdb)
  	}
  
  	if len(pdbList) == 0 {
  		return nil, fmt.Errorf("could not find PodDisruptionBudget for pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
  	}
  
  	return pdbList, nil
  }
docs: // GetPodPodDisruptionBudgets returns a list of PodDisruptionBudgets matching a pod.  Returns an error only if no matching PodDisruptionBudgets are found.