[erlang-questions] cannot send messages to a C-node

Pablo Polvorin <>
Fri Apr 24 17:39:38 CEST 2009


Have you tried the ei_* API instead?,
(http://erlang.org/doc/apps/erl_interface/index.html)
ei has a number of advantages,  I think it is the preferred way to
write c code,



2009/4/24 robbie13 <>:
>
> hi all,
>
> i cannot find a way to send messages to an erlang c-node. i create the
> c-node with the following:
>
> ------------------------------------------
> struct in_addr addr;
> addr.s_addr = inet_addr("127.0.0.1");
> if (erl_connect_xinit("rob.loc", "http_cnode", "", &addr,
> "secretcookie", 0) == -1)
>        erl_err_quit("erl_connect_xinit");
> if (erl_connect("") == -1)
>        erl_err_quit("erl_connect");
> ------------------------------------------
> rob.loc is configured in my /etc/hosts file to point to 127.0.0.1.
>
> i do get connected, and as i can see from my  erlang shell:
> ------------------------------------------
> ()21> nodes(hidden).
> ['']
> ------------------------------------------
>
> the code i have to receive messages is the typical:
> ------------------------------------------
> unsigned char buf[BUFSIZE];              /* Buffer for incoming message */
> ErlMessage emsg;                         /* Incoming message */
>
> while (1) {
>        fprintf(stderr, "start\n\r");
>        got = erl_receive_msg(fd, buf, BUFSIZE, &emsg);
>        fprintf(stderr, "GOT MESSAGE\n\r");
>        if (got == ERL_TICK) {
>                continue;
>        ...
> ------------------------------------------
>
> if i send a message to the node:
> ------------------------------------------
> ()22> {any, } ! {test, "hello!"}.
> {test, "hello!"}
> ------------------------------------------
> the code of the c-node never gets to the GOT MESSAGE printout.
>
> instead, if i initialize the c-node with:
> ------------------------------------------
> if (erl_connect_init(1, "secretcookie", 0) == -1)
>        erl_err_quit("erl_connect_init");
> if ((fd = erl_connect("")) < 0)
>        erl_err_quit("erl_connect");
> ------------------------------------------
> everything works correctly, but i cannot specify an hostname for the c-node.
>
> any kind soul would have a clue to this? thank you in advance..
>
> r.
> --
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>
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