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Non-blocking socket communication with GIO




Hello,

i’m working on an app that communicates with a network service using a
custom binary protocol.  For that i have a GSocketClient.  The
destination can, in theory, be either a TCP/IP or a UNIX socket (only
TCP/IP is implemented yet).  I initiate the connection like this:

    scuttler->socket_client = g_socket_client_new();

    address = g_inet_address_new_from_string("127.0.0.1");
    destination = g_inet_socket_address_new(address, 8008);
    g_object_unref(address);

    g_task_set_task_data(task, g_object_ref(scuttler), (GDestroyNotify)g_object_unref);

    g_socket_client_connect_async(scuttler->socket_client, G_SOCKET_CONNECTABLE(destination), cancellable, connection_finished, task);

Then, in connecion_finished(), among other things, i do this:

    scuttler->connection = connection;

    if (!ssb_scuttler_shs_connect(scuttler, &err)) {
        g_task_return_error(task, err);
        g_object_unref(task);

        return;
    }

    socket = g_socket_connection_get_socket(connection);
    g_socket_set_blocking(socket, FALSE);
    socket_source = g_socket_create_source(socket, G_IO_IN | G_IO_PRI, NULL);
    g_source_set_callback(socket_source,
                          (GSourceFunc)read_inbound,
                          g_object_ref(scuttler), g_object_unref);
    g_source_attach(socket_source, g_main_context_get_thread_default());

However, my read_inbound() function never gets called, even though my
request ends up in the server (i can see it in the logs).  Am i missing
something fundamental here?

(Also, this is not really GTK, but more like GLib/GIO specific; if there
is a better mailing list to send this, please advise.)

Best,
Gergely
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