[erlang-questions] Pass message from C code to Erlang

Alexander Kuleshov <>
Sat Aug 20 18:53:56 CEST 2011


Hello,

I try to send message from C code to erlang. I use EI Library.

My C code:

    int main (int argc, char** argv)
    {
      erl_init (NULL, 0);

      extern const char *erl_thisnodename(void);
      extern short erl_thiscreation(void);

      #define SELF(fd) erl_mk_pid(erl_thisnodename(), fd, 0,
erl_thiscreation())

      ETERM *arr[2], *emsg;

      int sockfd, creation=1;

      arr[0] = SELF(sockfd);
      arr[1] = erl_mk_atom("ok");
      emsg   = erl_mk_tuple(arr, 2);

      erl_reg_send(sockfd, "my_server", emsg);
      erl_free_term(emsg);

      return (EXIT_SUCCESS);
    }

And my erlang code:

    start() ->
     Pid = spawn(?MODULE, loop, []),
     register(my_server, Pid).

    loop() ->
     receive
     {ok} ->
     io:format("Ok received \n"),
     loop();
     stop ->
     stop;
     _ ->
     io:format("Somethig else \n")
        end.

    stop() ->
     my_server ! stop.

But when i run my C application, erlang application nothing received. What's
wrong?

Thank you.
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