diff options
Diffstat (limited to 'examples/C/glib/monitor-nm-running-dbus-glib.c')
| -rw-r--r-- | examples/C/glib/monitor-nm-running-dbus-glib.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/examples/C/glib/monitor-nm-running-dbus-glib.c b/examples/C/glib/monitor-nm-running-dbus-glib.c new file mode 100644 index 00000000..3290fb1a --- /dev/null +++ b/examples/C/glib/monitor-nm-running-dbus-glib.c @@ -0,0 +1,125 @@ +/* -*- 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 whether NM is running by checking D-Bus + * NameOwnerChanged signal. + * It uses dbus-glib library. + * + * Standalone compilation: + * gcc -Wall `pkg-config --libs --cflags glib-2.0 dbus-glib-1` monitor-nm-running.c -o monitor-nm-running + */ + +#include <glib.h> +#include <dbus/dbus-glib.h> +#include <dbus/dbus-glib-bindings.h> +#include <string.h> + +#define NM_DBUS_SERVICE "org.freedesktop.NetworkManager" + +static void +proxy_name_owner_changed (DBusGProxy *proxy, + const char *name, + const char *old_owner, + const char *new_owner, + gpointer user_data) +{ + gboolean *nm_running = (gboolean *) user_data; + gboolean old_good = (old_owner && strlen (old_owner)); + gboolean new_good = (new_owner && strlen (new_owner)); + gboolean new_running = FALSE; + + /* We are only interested in NetworkManager */ + if (!name || strcmp (name, NM_DBUS_SERVICE) != 0) + return; + + if (!old_good && new_good) + new_running = TRUE; + else if (old_good && !new_good) + new_running = FALSE; + + *nm_running = new_running; + + g_print ("name: '%s', old_owner: '%s', new_owner: '%s'", name, old_owner, new_owner); + g_print (" => NM is %s\n", *nm_running ? "running" : "not running"); +} + + +int +main (int argc, char *argv[]) +{ + DBusGConnection *bus; + DBusGProxy *bus_proxy; + GMainLoop *loop = NULL; + GError *err = NULL; + gboolean nm_running; + + /* Initialize GType system */ + g_type_init (); + + g_print ("Monitor 'org.freedesktop.NetworkManager' D-Bus name\n"); + g_print ("===================================================\n"); + + /* Get system bus */ + bus = dbus_g_bus_get (DBUS_BUS_SYSTEM, NULL); + + /* Create a D-Bus proxy to D-Bus daemon */ + bus_proxy = dbus_g_proxy_new_for_name (bus, + "org.freedesktop.DBus", + "/org/freedesktop/DBus", + "org.freedesktop.DBus"); + + if (!bus_proxy) { + g_message ("Error: Couldn't create D-Bus object proxy for org.freedesktop.DBus."); + dbus_g_connection_unref (bus); + return -1; + } + + /* Call NameHasOwner method to find out if NM is running. When NM runs it claims + * 'org.freedesktop.NetworkManager' service name on D-Bus */ + if (!org_freedesktop_DBus_name_has_owner (bus_proxy, NM_DBUS_SERVICE, &nm_running, &err)) { + g_message ("Error: NameHasOwner request failed: %s", + (err && err->message) ? err->message : "(unknown)"); + g_clear_error (&err); + g_object_unref (bus_proxy); + dbus_g_connection_unref (bus); + return -1; + } + g_print ("NM is %s\n", nm_running ? "running" : "not running"); + + + /* Connect to NameOwnerChanged signal to monitor NM running state */ + dbus_g_proxy_add_signal (bus_proxy, "NameOwnerChanged", + G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, + G_TYPE_INVALID); + dbus_g_proxy_connect_signal (bus_proxy, + "NameOwnerChanged", + G_CALLBACK (proxy_name_owner_changed), + &nm_running, NULL); + + loop = g_main_loop_new (NULL, FALSE); /* Create main loop */ + g_main_loop_run (loop); /* Run main loop */ + + g_object_unref (bus_proxy); + dbus_g_connection_unref (bus); + + return 0; +} + |