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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright 2019 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gmemorymonitor.h"
#include "gmemorymonitordbus.h"
#include "gioerror.h"
#include "ginitable.h"
#include "giomodule-priv.h"
#include "glibintl.h"
#include "glib/gstdio.h"
#include "gdbusproxy.h"
#include "gdbusnamewatching.h"
#define G_MEMORY_MONITOR_DBUS_GET_INITABLE_IFACE(o) (G_TYPE_INSTANCE_GET_INTERFACE ((o), G_TYPE_INITABLE, GInitable))
static void g_memory_monitor_dbus_iface_init (GMemoryMonitorInterface *iface);
static void g_memory_monitor_dbus_initable_iface_init (GInitableIface *iface);
struct _GMemoryMonitorDBus
{
GObject parent_instance;
guint watch_id;
GDBusProxy *proxy;
gulong signal_id;
};
G_DEFINE_TYPE_WITH_CODE (GMemoryMonitorDBus, g_memory_monitor_dbus, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE,
g_memory_monitor_dbus_initable_iface_init)
G_IMPLEMENT_INTERFACE (G_TYPE_MEMORY_MONITOR,
g_memory_monitor_dbus_iface_init)
_g_io_modules_ensure_extension_points_registered ();
g_io_extension_point_implement (G_MEMORY_MONITOR_EXTENSION_POINT_NAME,
g_define_type_id,
"dbus",
30))
static void
g_memory_monitor_dbus_init (GMemoryMonitorDBus *dbus)
{
}
static void
proxy_signal_cb (GDBusProxy *proxy,
const gchar *sender_name,
const gchar *signal_name,
GVariant *parameters,
GMemoryMonitorDBus *dbus)
{
guint8 level;
if (g_strcmp0 (signal_name, "LowMemoryWarning") != 0)
return;
if (parameters == NULL)
return;
g_variant_get (parameters, "(y)", &level);
g_signal_emit_by_name (dbus, "low-memory-warning", level);
}
static void
lmm_appeared_cb (GDBusConnection *connection,
const gchar *name,
const gchar *name_owner,
gpointer user_data)
{
GMemoryMonitorDBus *dbus = user_data;
GDBusProxy *proxy;
GError *error = NULL;
proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START,
NULL,
"org.freedesktop.LowMemoryMonitor",
"/org/freedesktop/LowMemoryMonitor",
"org.freedesktop.LowMemoryMonitor",
NULL,
&error);
if (!proxy)
{
g_debug ("Failed to create LowMemoryMonitor D-Bus proxy: %s",
error->message);
g_error_free (error);
return;
}
dbus->signal_id = g_signal_connect (G_OBJECT (proxy), "g-signal",
G_CALLBACK (proxy_signal_cb), dbus);
dbus->proxy = proxy;
}
static void
lmm_vanished_cb (GDBusConnection *connection,
const gchar *name,
gpointer user_data)
{
GMemoryMonitorDBus *dbus = user_data;
if (dbus->proxy != NULL)
g_clear_signal_handler (&dbus->signal_id, dbus->proxy);
g_clear_object (&dbus->proxy);
}
static gboolean
g_memory_monitor_dbus_initable_init (GInitable *initable,
GCancellable *cancellable,
GError **error)
{
GMemoryMonitorDBus *dbus = G_MEMORY_MONITOR_DBUS (initable);
dbus->watch_id = g_bus_watch_name (G_BUS_TYPE_SYSTEM,
"org.freedesktop.LowMemoryMonitor",
G_BUS_NAME_WATCHER_FLAGS_AUTO_START,
lmm_appeared_cb,
lmm_vanished_cb,
dbus,
NULL);
return TRUE;
}
static void
g_memory_monitor_dbus_finalize (GObject *object)
{
GMemoryMonitorDBus *dbus = G_MEMORY_MONITOR_DBUS (object);
if (dbus->proxy != NULL)
g_clear_signal_handler (&dbus->signal_id, dbus->proxy);
g_clear_object (&dbus->proxy);
g_clear_handle_id (&dbus->watch_id, g_bus_unwatch_name);
G_OBJECT_CLASS (g_memory_monitor_dbus_parent_class)->finalize (object);
}
static void
g_memory_monitor_dbus_class_init (GMemoryMonitorDBusClass *nl_class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (nl_class);
gobject_class->finalize = g_memory_monitor_dbus_finalize;
}
static void
g_memory_monitor_dbus_iface_init (GMemoryMonitorInterface *monitor_iface)
{
}
static void
g_memory_monitor_dbus_initable_iface_init (GInitableIface *iface)
{
iface->init = g_memory_monitor_dbus_initable_init;
}
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