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eg for an exit relay of ~ 2000 inbound+outbound connections sometimes the following code snippet

...
   try:
      connections = get_connections(resolver, process_pid = pid, process_name = 'tor')
      print " connections: %4i" % len(connections)
...
    except Exception as exc:
      print exc

gives :

 platform supports connection resolution via: proc, netstat, lsof, ss (picked: proc)
 1 instance(s) of tor: 2223 (picked: 2223)
unable to determine file descriptor destination: /proc/2223/fd/985

IMO if the "proc" resolver fails due to some race conditions for a particular connection it should deliver data for all the other connections.