38382770aa
- the first uses dbus-glib and D-Bus "NameOwnerChanged" signal directly - the second uses GIO's g_bus_watch_name() - the third uses Qt and QDBusServiceWatcher class
126 lines
4.1 KiB
C
126 lines
4.1 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
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/* vim: set ft=c ts=4 sts=4 sw=4 noexpandtab smartindent: */
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* (C) Copyright 2012 Red Hat, Inc.
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*/
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/*
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* This example monitors whether NM is running by checking D-Bus
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* NameOwnerChanged signal.
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* It uses dbus-glib library.
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*
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* Standalone compilation:
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* gcc -Wall `pkg-config --libs --cflags glib-2.0 dbus-glib-1` monitor-nm-running.c -o monitor-nm-running
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*/
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#include <glib.h>
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#include <dbus/dbus-glib.h>
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#include <dbus/dbus-glib-bindings.h>
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#include <string.h>
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#define NM_DBUS_SERVICE "org.freedesktop.NetworkManager"
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static void
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proxy_name_owner_changed (DBusGProxy *proxy,
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const char *name,
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const char *old_owner,
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const char *new_owner,
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gpointer user_data)
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{
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gboolean *nm_running = (gboolean *) user_data;
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gboolean old_good = (old_owner && strlen (old_owner));
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gboolean new_good = (new_owner && strlen (new_owner));
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gboolean new_running = FALSE;
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/* We are only interested in NetworkManager */
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if (!name || strcmp (name, NM_DBUS_SERVICE) != 0)
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return;
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if (!old_good && new_good)
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new_running = TRUE;
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else if (old_good && !new_good)
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new_running = FALSE;
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*nm_running = new_running;
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g_print ("name: '%s', old_owner: '%s', new_owner: '%s'", name, old_owner, new_owner);
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g_print (" => NM is %s\n", *nm_running ? "running" : "not running");
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}
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int
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main (int argc, char *argv[])
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{
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DBusGConnection *bus;
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DBusGProxy *bus_proxy;
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GMainLoop *loop = NULL;
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GError *err = NULL;
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gboolean nm_running;
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/* Initialize GType system */
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g_type_init ();
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g_print ("Monitor 'org.freedesktop.NetworkManager' D-Bus name\n");
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g_print ("===================================================\n");
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/* Get system bus */
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bus = dbus_g_bus_get (DBUS_BUS_SYSTEM, NULL);
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/* Create a D-Bus proxy to D-Bus daemon */
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bus_proxy = dbus_g_proxy_new_for_name (bus,
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus");
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if (!bus_proxy) {
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g_message ("Error: Couldn't create D-Bus object proxy for org.freedesktop.DBus.");
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dbus_g_connection_unref (bus);
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return -1;
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}
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/* Call NameHasOwner method to find out if NM is running. When NM runs it claims
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* 'org.freedesktop.NetworkManager' service name on D-Bus */
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if (!org_freedesktop_DBus_name_has_owner (bus_proxy, NM_DBUS_SERVICE, &nm_running, &err)) {
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g_message ("Error: NameHasOwner request failed: %s",
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(err && err->message) ? err->message : "(unknown)");
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g_clear_error (&err);
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g_object_unref (bus_proxy);
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dbus_g_connection_unref (bus);
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return -1;
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}
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g_print ("NM is %s\n", nm_running ? "running" : "not running");
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/* Connect to NameOwnerChanged signal to monitor NM running state */
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dbus_g_proxy_add_signal (bus_proxy, "NameOwnerChanged",
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G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING,
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G_TYPE_INVALID);
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dbus_g_proxy_connect_signal (bus_proxy,
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"NameOwnerChanged",
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G_CALLBACK (proxy_name_owner_changed),
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&nm_running, NULL);
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loop = g_main_loop_new (NULL, FALSE); /* Create main loop */
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g_main_loop_run (loop); /* Run main loop */
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g_object_unref (bus_proxy);
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dbus_g_connection_unref (bus);
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return 0;
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}
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