Gracefully terminating an Erlang server or fsm?

Question

I have a module that has the behavior of gen_fsm. Right now I am terminating it by returning the standard {stop, Reason, State} in an appropriate state/message.

It seems to terminate correctly, but it's considered an error during runtime.

Is this normal? Is there a way to stop the fsm process without it being considered an error?

Answer 1

The return value is {stop,Reason,StateData} not {stop,StateName,StateData}.

An error report is generated if Reason is something other than normal or shutdown. For a normal exit of your server use normal, shutdown is used when the server is asked to exit by its supervisor.

(Edit now that error details have been added.)

gen_fsm is calling client_fsm:terminate(normal, loggedin, {state,#Port<0.144>,12345,"Bob"})

which is leading to a function_clause exception (the function exists but no clause can be matched against those arguments). If you change client_fsm:terminate/3 so that that call succeeds the error should go away.