erlang - monitor send information to shell and not to the gen_server

Question

I'm trying to connect a gen_server to another gen_server and during the connect the servers need to monitor each other and know when the server has crashed, either the entire node or the server process. after im doing the first start_link and one of the servers crashes the other server gets a message from the monitor in the code (handle_info function is activated), but when it happens for the second time the monitor sends the information directly to the shell (the message does not go through the handle_info and goes directly to the shell only visible using flush() inside the shell) and the server that was suppose to be alerted from the monitor doesn't receive any message. my code in the sending side:

handle_call({connect, Node, Who}, _From, _State) ->
  case Who of
    cdot -> ets:insert(address, {cdot, Node}), ets:insert(address, 
{Node, cdot}), monitor_node(Node, true);
    cact -> ets:insert(address, {cact, Node}), ets:insert(address, 
{Node, cdot}), monitor_node(Node ,true);
    ctitles -> ets:insert(address, {ctitles, Node}), 
ets:insert(address, {Node, cdot}), monitor_node(Node, true);
    _-> ok
  end,
  [{_, Pid2}] = ets:lookup(?name_table3, pidGui),
  Pid2 ! {db, "Node "++ atom_to_list(Who) ++ " connected"}, %print to 
gui witch node was connected
  {reply, {{node(), self()}, connected}, node()};

and the one in the receiving side is:

connect() ->
  {{Node, Pid}, Connected} = gen_server:call(server_node(), {connect, 
node(), cact}),
  monitor_node(Node, true),
  monitor(process, Pid),
  Connected.

please can anyone tell me why this is happening?

the same happens for either node or process monitoring

Pascal Pascal · Accepted Answer · 2018-08-17T06:42:11

If you get the second monitor message in the shell, it is because you call the connect function in the shell context.

Check how you call this function, it must be done in the server context, it means inside a handle_call, handle_cast or handle_info function.

erlang - monitor send information to shell and not to the gen_server

2 Answers