func: void hmp_cont(Monitor *mon, const QDict *qdict)
  
  {
  
      BlockInfoList *bdev_list, *bdev;
  
      Error *err = NULL;
  
  
  
      bdev_list = qmp_query_block(NULL);
  
      for (bdev = bdev_list; bdev; bdev = bdev->next) {
  
          if (key_is_missing(bdev->value)) {
  
              monitor_read_block_device_key(mon, bdev->value->device,
  
                                            hmp_cont_cb, NULL);
  
              goto out;
  
          }
  
      }
  
  
  
      qmp_cont(&err);
  
      hmp_handle_error(mon, &err);
  
  
  
  out:
  
      qapi_free_BlockInfoList(bdev_list);
  
  }
  