Erlang Get Sname Given Pid

Question

I have three Erlang nodes running on different machines, started as follows:

erl -sname test@box1 -cookie cookie (on one machine)
erl -sname test@box2 -cookie cookie (on another machine)
erl -sname test@box3 -cookie cookie (on a third machine)

Box1 is the master. Box2 and Box3 are workers. When Box1 sends out a task to Box2 and Box3, they both respond with results. However, at this point, Box1 only knows the pids of the Erlang process on Boxes 2 and 3. Is there any way to get the sname for the remote process, given the pid? Or does the remote process have to send back its hostname?

Answer 1

You can use the node/1 function:

3> node(self()).
nonode@nohost