rom/dbus/test/dbus-ping-listen.c

   1 #include <glib.h>
   2 #include <dbus/dbus.h>
   3 #include <dbus/dbus-glib.h>
   4
   5 static DBusHandlerResult signal_filter
   6       (DBusConnection *connection, DBusMessage *message, void *user_data);
   7
   8 int
   9 main (int argc, char **argv)
  10 {
  11   GMainLoop *loop;
  12   DBusConnection *bus;
  13   DBusError error;
  14
  15   loop = g_main_loop_new (NULL, FALSE);
  16
  17   dbus_error_init (&error);
  18   bus = dbus_bus_get (DBUS_BUS_SESSION, &error);
  19   if (!bus) {
  20     g_warning ("Failed to connect to the D-BUS daemon: %s", error.message);
  21     dbus_error_free (&error);
  22     return 1;
  23   }
  24   dbus_connection_setup_with_g_main (bus, NULL);
  25
  26   /* listening to messages from all objects as no path is specified */
  27   dbus_bus_add_match (bus, "type='signal',interface='com.burtonini.dbus.Signal'", &error);
  28   dbus_connection_add_filter (bus, signal_filter, loop, NULL);
  29
  30   g_main_loop_run (loop);
  31   return 0;
  32 }
  33
  34 static DBusHandlerResult
  35 signal_filter (DBusConnection *connection, DBusMessage *message, void *user_data)
  36 {
  37   /* User data is the event loop we are running in */
  38   GMainLoop *loop = user_data;
  39
  40   /* A signal from the bus saying we are about to be disconnected */
  41   if (dbus_message_is_signal
  42         (message, DBUS_INTERFACE_ORG_FREEDESKTOP_LOCAL, "Disconnected")) {
  43     /* Tell the main loop to quit */
  44     g_main_loop_quit (loop);
  45     /* We have handled this message, don't pass it on */
  46     return DBUS_HANDLER_RESULT_HANDLED;
  47   }
  48   /* A Ping signal on the com.burtonini.dbus.Signal interface */
  49   else if (dbus_message_is_signal (message, "com.burtonini.dbus.Signal", "Ping")) {
  50     DBusError error;
  51     char *s;
  52     dbus_error_init (&error);
  53     if (dbus_message_get_args
  54        (message, &error, DBUS_TYPE_STRING, &s, DBUS_TYPE_INVALID)) {
  55       g_print("Ping received: %s\n", s);
  56       dbus_free (s);
  57     } else {
  58       g_print("Ping received, but error getting message: %s\n", error.message);
  59       dbus_error_free (&error);
  60     }
  61     return DBUS_HANDLER_RESULT_HANDLED;
  62   }
  63   return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
  64 }