examples: add C example for monitoring overall NetworkManager state

examples/C/glib/Makefile.am

@@ -15,7 +15,8 @@ noinst_PROGRAMS = \
 	list-connections-libnm-glib \
 	get-ap-info-libnm-glib \
 	monitor-nm-running-dbus-glib \
-	monitor-nm-running-GDBus
+	monitor-nm-running-GDBus \
+	monitor-nm-state-GDBus
 
 add_connection_dbus_glib_SOURCES = add-connection-dbus-glib.c
 add_connection_dbus_glib_LDADD = \
@@ -65,6 +66,10 @@ monitor_nm_running_GDBus_SOURCES = monitor-nm-running-GDBus.c
 monitor_nm_running_GDBus_LDADD = \
 	$(GIO_LIBS)
 
+monitor_nm_state_GDBus_SOURCES = monitor-nm-state-GDBus.c
+monitor_nm_state_GDBus_LDADD = \
+	$(GIO_LIBS)
+
 EXTRA_DIST = \
 	add-connection-dbus-glib.c \
 	add-connection-libnm-glib.c \
@@ -73,5 +78,6 @@ EXTRA_DIST = \
 	list-connections-libnm-glib.c \
 	get-ap-info-libnm-glib.c \
 	monitor-nm-running-dbus-glib.c \
-	monitor-nm-running-GDBus.c
+	monitor-nm-running-GDBus.c \
+	monitor-nm-state-GDBus.c
 

examples/C/glib/monitor-nm-state-GDBus.c

+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
+/* vim: set ft=c ts=4 sts=4 sw=4 noexpandtab smartindent: */
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * (C) Copyright 2012 Red Hat, Inc.
+ */
+
+/*
+ * This example monitors NM state via D-Bus "StateChanged" signal on
+ * "org.freedesktop.NetworkManager" object.
+ * It uses GDBus.
+
+ * You don't need to have NetworkManager devel package installed. You can just
+ * grab NetworkManager.h and put it in the path.
+ *
+ * Standalone compilation:
+ *   gcc -Wall `pkg-config --libs --cflags glib-2.0 gio-2.0 NetworkManager` monitor-nm-state-GDBus.c -o monitor-nm-state-GDBus
+ */
+
+#include <gio/gio.h>
+#include <string.h>
+#include <NetworkManager.h>
+
+static const char *
+nm_state_to_string (NMState state)
+{
+	switch (state) {
+	case NM_STATE_ASLEEP:
+		return "asleep";
+	case NM_STATE_CONNECTING:
+		return "connecting";
+	case NM_STATE_CONNECTED_LOCAL:
+		return "connected (local only)";
+	case NM_STATE_CONNECTED_SITE:
+		return "connected (site only)";
+	case NM_STATE_CONNECTED_GLOBAL:
+		return "connected";
+	case NM_STATE_DISCONNECTING:
+		return "disconnecting";
+	case NM_STATE_DISCONNECTED:
+		return "disconnected";
+	case NM_STATE_UNKNOWN:
+	default:
+		return "unknown";
+	}
+}
+
+static void
+on_signal (GDBusProxy *proxy,
+           gchar      *sender_name,
+           gchar      *signal_name,
+           GVariant   *parameters,
+           gpointer    user_data)
+{
+	guint32 new_state;
+
+	/* Print all signals */
+	//gchar *parameters_str;
+	//parameters_str = g_variant_print (parameters, TRUE);
+	//g_print (" *** Received Signal: %s: %s\n", signal_name, parameters_str);
+	//g_free (parameters_str);
+
+	/* We are only interested in "StateChanged" signal */
+	if (strcmp (signal_name, "StateChanged") == 0) {
+		GVariant *tmp = g_variant_get_child_value (parameters, 0);
+		new_state = g_variant_get_uint32 (tmp);
+		g_variant_unref (tmp);
+		g_print ("NetworkManager state is: (%d) %s\n", new_state, nm_state_to_string ((NMState) new_state));
+	}
+}
+
+
+int
+main (int argc, char *argv[])
+{
+	GMainLoop *loop;
+	GError *error = NULL;
+	GDBusProxyFlags flags;
+	GDBusProxy *proxy;
+
+	/* Initialize GType system */
+	g_type_init ();
+
+	/* Monitor 'StateChanged' signal on 'org.freedesktop.NetworkManager' interface */
+	g_print ("Monitor NetworkManager's state\n");
+	g_print ("==============================\n");
+
+	flags = G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES | G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START;
+	proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
+                                           flags,
+                                           NULL, /* GDBusInterfaceInfo */
+                                           "org.freedesktop.NetworkManager",
+                                           "/org/freedesktop/NetworkManager",
+                                           "org.freedesktop.NetworkManager",
+                                           NULL, /* GCancellable */
+                                           &error);
+
+	if (proxy == NULL)
+	{
+		g_printerr ("Error creating D-Bus proxy: %s\n", error->message);
+		g_error_free (error);
+		return -1;
+	}
+
+	/* Connect to g-signal to receive signals from proxy (remote object) */
+	g_signal_connect (proxy,
+	                  "g-signal",
+	                  G_CALLBACK (on_signal),
+	                  NULL);
+
+	/* Run main loop */
+	loop = g_main_loop_new (NULL, FALSE);
+	g_main_loop_run (loop);
+
+	g_object_unref (proxy);
+
+	return 0;
+}
+