[erlang-questions] Request for help on creating BIF (or finding existing one)

Ulf Wiger <>
Wed Mar 11 00:15:57 CET 2009

=Bill.Barnhill wrote:
> I was recently asked how to have a process get its registered name. 
> AFAIK there is no BIF for this. It can be accomplished via:
> [ N || N <- global:registered_names(), global:whereis_name(N) == self()]
> which will either return [] if it's not registered or [Name] if it is.

Here's a way to do it without BIFs, and with some peeking in
global's innards:

names(Pid) when is_pid(Pid) ->
   Global = [{global,G} ||
               {_, G} <- ets:lookup(global_pid_names, Pid)],
   case process_info(Pid, registered_name) of
     {registered_name, N} ->
         [{local, N}|Global];
     [] ->

Ulf W

Ulf Wiger
CTO, Erlang Training & Consulting Ltd

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