Commit 38382770 authored by Jiří Klimeš's avatar Jiří Klimeš

examples: add C examples for monitoring whether NM runs

- 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
parent 8ad3ff24
......@@ -300,6 +300,9 @@ if (test "${enable_qt}" = "yes"); then
fi
AC_SUBST(QT_CFLAGS)
AC_SUBST(QT_LIBS)
# Check for moc-qt4 and if not found then moc
QT4_BINDIR=`$PKG_CONFIG Qt --variable bindir`
AC_CHECK_PROGS(MOC, [moc-qt4 moc],, [$QT4_BINDIR:$PATH])
fi
AM_CONDITIONAL(WITH_QT, test "${enable_qt}" = "yes")
......
......@@ -13,7 +13,9 @@ noinst_PROGRAMS = \
get-active-connections-dbus-glib \
list-connections-dbus-glib \
list-connections-libnm-glib \
get-ap-info-libnm-glib
get-ap-info-libnm-glib \
monitor-nm-running-dbus-glib \
monitor-nm-running-GDBus
add_connection_dbus_glib_SOURCES = add-connection-dbus-glib.c
add_connection_dbus_glib_LDADD = \
......@@ -54,11 +56,22 @@ get_ap_info_libnm_glib_LDADD = \
$(DBUS_LIBS) \
$(GLIB_LIBS)
monitor_nm_running_dbus_glib_SOURCES = monitor-nm-running-dbus-glib.c
monitor_nm_running_dbus_glib_LDADD = \
$(DBUS_LIBS) \
$(GLIB_LIBS)
monitor_nm_running_GDBus_SOURCES = monitor-nm-running-GDBus.c
monitor_nm_running_GDBus_LDADD = \
$(GIO_LIBS)
EXTRA_DIST = \
add-connection-dbus-glib.c \
add-connection-libnm-glib.c \
get-active-connections-dbus-glib.c \
list-connections-dbus-glib.c \
list-connections-libnm-glib.c \
get-ap-info-libnm-glib.c
get-ap-info-libnm-glib.c \
monitor-nm-running-dbus-glib.c \
monitor-nm-running-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 whether NM is running by checking if
* "org.freedesktop.NetworkManager" is owned by a process on D-Bus.
* It uses g_bus_watch_name().
*
* See also http://developer.gnome.org/gio/stable/gio-Watching-Bus-Names.html
*
* Standalone compilation:
* gcc -Wall `pkg-config --libs --cflags glib-2.0 gio-2.0` monitor-nm-running-GDBus.c -o monitor-nm-running-GDBus
*/
#include <gio/gio.h>
static void
on_name_appeared (GDBusConnection *connection,
const gchar *name,
const gchar *name_owner,
gpointer user_data)
{
g_print ("Name '%s' on the system bus is owned by %s => NM is running\n",
name, name_owner);
}
static void
on_name_vanished (GDBusConnection *connection,
const gchar *name,
gpointer user_data)
{
g_print ("Name '%s' does not exist on the system bus => NM is not running\n", name);
}
int
main (int argc, char *argv[])
{
guint watcher_id;
GMainLoop *loop;
GBusNameWatcherFlags flags;
/* Initialize GType system */
g_type_init ();
g_print ("Monitor 'org.freedesktop.NetworkManager' D-Bus name\n");
g_print ("===================================================\n");
flags = G_BUS_NAME_WATCHER_FLAGS_NONE;
/* Start to watch "org.freedesktop.NetworkManager" bus name */
watcher_id = g_bus_watch_name (G_BUS_TYPE_SYSTEM,
"org.freedesktop.NetworkManager",
flags,
on_name_appeared,
on_name_vanished,
NULL,
NULL);
/* Run main loop */
loop = g_main_loop_new (NULL, FALSE);
g_main_loop_run (loop);
/* Stop watching the name */
g_bus_unwatch_name (watcher_id);
return 0;
}
/* -*- 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;
}
......@@ -8,7 +8,8 @@ AM_CPPFLAGS = \
noinst_PROGRAMS = \
add-connection-wired \
list-connections \
change-ipv4-addresses
change-ipv4-addresses \
monitor-nm-running
add_connection_wired_SOURCES = add-connection-wired.cpp
add_connection_wired_LDADD = \
......@@ -25,8 +26,22 @@ change_ipv4_addresses_LDADD = \
$(DBUS_LIBS) \
$(QT_LIBS)
monitor_nm_running_SOURCES = monitor-nm-running.cpp
monitor_nm_running_LDADD = \
$(DBUS_LIBS) \
$(QT_LIBS)
monitor-nm-running.moc: monitor-nm-running.cpp
$(AM_V_GEN) $(MOC) -i $< -o $@
BUILT_SOURCES = \
monitor-nm-running.moc
EXTRA_DIST = \
add-connection-wired.cpp \
list-connections.cpp \
change-ipv4-addresses.cpp
change-ipv4-addresses.cpp \
monitor-nm-running.cpp
CLEANFILES = $(BUILT_SOURCES)
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
/* vim: set ft=c ts=4 sts=4 sw=4 expandtab 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 if
* "org.freedesktop.NetworkManager" is owned by a process on D-Bus.
* It uses QDBusServiceWatcher class.
*
* Standalone compilation:
* moc-qt4 monitor-nm-running.cpp -o monitor-nm-running.moc
* g++ -Wall `pkg-config --libs --cflags QtCore QtDBus` monitor-nm-running.cpp -o monitor-nm-running
*
* You don't need to have NetworkManager devel package installed.
*/
#include <iostream>
#include <QObject>
#include <QCoreApplication>
#include <QtDBus/QDBusServiceWatcher>
#include <QtDBus/QDBusConnection>
#include <QtCore/QDebug>
const QString NM_DBUS_SERVICE = "org.freedesktop.NetworkManager";
// Define a class with slots
class NMWatcher: public QObject {
Q_OBJECT;
public slots:
void serviceRegistered(const QString& name);
void serviceUnregistered(const QString& name);
};
void NMWatcher::serviceRegistered(const QString& name)
{
std::cout << "Name '" << name.toStdString() << "' registered"
<< " => NM is running" << std::endl;
}
void NMWatcher::serviceUnregistered(const QString& name)
{
std::cout << "Name '" << name.toStdString() << "' unregistered"
<< " => NM is not running" << std::endl;
}
int main(int argc, char *argv[])
{
QCoreApplication app (argc, argv);
qDebug() << "Monitor 'org.freedesktop.NetworkManager' D-Bus name";
qDebug() << "===================================================";
NMWatcher nm_watcher;
// Watch all changes of D-Bus NM_DBUS_SERVICE name
QDBusServiceWatcher *watcher = new QDBusServiceWatcher(NM_DBUS_SERVICE,
QDBusConnection::systemBus());
QObject::connect(watcher, SIGNAL(serviceRegistered(const QString&)),
&nm_watcher, SLOT(serviceRegistered(const QString&)));
QObject::connect(watcher, SIGNAL(serviceUnregistered(const QString&)),
&nm_watcher, SLOT(serviceUnregistered(const QString&)));
app.exec();
delete watcher;
return 0;
}
#include "monitor-nm-running.moc"
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