gio/tests/gdbus-example-watch-name.c

   1 #include <gio/gio.h>
   2
   3 static gchar *opt_name         = NULL;
   4 static gboolean opt_system_bus = FALSE;
   5 static gboolean opt_auto_start = FALSE;
   6
   7 static GOptionEntry opt_entries[] =
   8 {
   9   { "name", 'n', 0, G_OPTION_ARG_STRING, &opt_name, "Name to watch", NULL },
  10   { "system-bus", 's', 0, G_OPTION_ARG_NONE, &opt_system_bus, "Use the system-bus instead of the session-bus", NULL },
  11   { "auto-start", 'a', 0, G_OPTION_ARG_NONE, &opt_auto_start, "Instruct the bus to launch an owner for the name", NULL},
  12   { NULL}
  13 };
  14
  15 static void
  16 on_name_appeared (GDBusConnection *connection,
  17                   const gchar     *name,
  18                   const gchar     *name_owner,
  19                   gpointer         user_data)
  20 {
  21   g_print ("Name %s on %s is owned by %s\n",
  22            name,
  23            opt_system_bus ? "the system bus" : "the session bus",
  24            name_owner);
  25 }
  26
  27 static void
  28 on_name_vanished (GDBusConnection *connection,
  29                   const gchar     *name,
  30                   gpointer         user_data)
  31 {
  32   g_print ("Name %s does not exist on %s\n",
  33            name,
  34            opt_system_bus ? "the system bus" : "the session bus");
  35 }
  36
  37 int
  38 main (int argc, char *argv[])
  39 {
  40   guint watcher_id;
  41   GMainLoop *loop;
  42   GOptionContext *opt_context;
  43   GError *error;
  44   GBusNameWatcherFlags flags;
  45
  46   error = NULL;
  47   opt_context = g_option_context_new ("g_bus_watch_name() example");
  48   g_option_context_set_summary (opt_context,
  49                                 "Example: to watch the power manager on the session bus, use:\n"
  50                                 "\n"
  51                                 "  ./example-watch-name -n org.gnome.PowerManager");
  52   g_option_context_add_main_entries (opt_context, opt_entries, NULL);
  53   if (!g_option_context_parse (opt_context, &argc, &argv, &error))
  54     {
  55       g_printerr ("Error parsing options: %s", error->message);
  56       goto out;
  57     }
  58   if (opt_name == NULL)
  59     {
  60       g_printerr ("Incorrect usage, try --help.\n");
  61       goto out;
  62     }
  63
  64   flags = G_BUS_NAME_WATCHER_FLAGS_NONE;
  65   if (opt_auto_start)
  66     flags |= G_BUS_NAME_WATCHER_FLAGS_AUTO_START;
  67
  68   watcher_id = g_bus_watch_name (opt_system_bus ? G_BUS_TYPE_SYSTEM : G_BUS_TYPE_SESSION,
  69                                  opt_name,
  70                                  flags,
  71                                  on_name_appeared,
  72                                  on_name_vanished,
  73                                  NULL,
  74                                  NULL);
  75
  76   loop = g_main_loop_new (NULL, FALSE);
  77   g_main_loop_run (loop);
  78
  79   g_bus_unwatch_name (watcher_id);
  80
  81  out:
  82   g_option_context_free (opt_context);
  83   g_free (opt_name);
  84
  85   return 0;
  86 }