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/* vi:set et ai sw=2 sts=2 ts=2: */
/* -
* Copyright (c) 2012 GENIVI.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <systemd/sd-daemon.h>
#include <glib-object.h>
#include <gio/gio.h>
#include <common/watchdog-client.h>
/**
* SECTION: watchdog-client
* @title: WatchdogClient
* @short_description: Notifies the systemd watchdog in regular intervals.
* @stability: Internal
*
* The #WatchdogClient notifies systemd's watchdog in a regular interval that
* is specified upon construction. If the unit file associated with the
* application has %WatchdogSec set then systemd will restart the application
* if it does not update the watchdog timestamp in this interval (e.g. if it
* has crashed or is stuck in an infinite loop).
*
* In order to avoid problems with delays it is recommended to notify the
* systemd watchdog twice in the %WatchdogSec interval, so usually the
* value passed to #watchdog_client_new will be half of %WatchdogSec.
*/
/* property identifiers */
enum
{
PROP_0,
PROP_TIMEOUT,
};
static void watchdog_client_constructed (GObject *object);
static void watchdog_client_finalize (GObject *object);
static void watchdog_client_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void watchdog_client_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static gboolean watchdog_client_timeout (gpointer user_data);
struct _WatchdogClientClass
{
GObjectClass __parent__;
};
struct _WatchdogClient
{
GObject __parent__;
guint timeout;
guint timeout_id;
};
G_DEFINE_TYPE (WatchdogClient, watchdog_client, G_TYPE_OBJECT);
static void
watchdog_client_class_init (WatchdogClientClass *klass)
{
GObjectClass *gobject_class;
gobject_class = G_OBJECT_CLASS (klass);
gobject_class->constructed = watchdog_client_constructed;
gobject_class->finalize = watchdog_client_finalize;
gobject_class->get_property = watchdog_client_get_property;
gobject_class->set_property = watchdog_client_set_property;
g_object_class_install_property (gobject_class,
PROP_TIMEOUT,
g_param_spec_uint ("timeout",
"timeout",
"timeout",
0, G_MAXUINT, 120,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS));
}
static void
watchdog_client_init (WatchdogClient *client)
{
}
static void
watchdog_client_constructed (GObject *object)
{
WatchdogClient *client = WATCHDOG_CLIENT (object);
/* trigger a systemd watchdog timestap update now */
watchdog_client_timeout (client);
/* schedule a regular timeout to update the systemd watchdog timestamp */
client->timeout_id = g_timeout_add_seconds_full (G_PRIORITY_DEFAULT,
client->timeout,
watchdog_client_timeout,
g_object_ref (client),
(GDestroyNotify) g_object_unref);
}
static void
watchdog_client_finalize (GObject *object)
{
WatchdogClient *client = WATCHDOG_CLIENT (object);
/* drop the watchdog timeout */
if (client->timeout_id > 0)
g_source_remove (client->timeout_id);
(*G_OBJECT_CLASS (watchdog_client_parent_class)->finalize) (object);
}
static void
watchdog_client_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
WatchdogClient *client = WATCHDOG_CLIENT (object);
switch (prop_id)
{
case PROP_TIMEOUT:
g_value_set_uint (value, client->timeout);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
watchdog_client_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
WatchdogClient *client = WATCHDOG_CLIENT (object);
switch (prop_id)
{
case PROP_TIMEOUT:
client->timeout = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
watchdog_client_timeout (gpointer user_data)
{
sd_notify (0, "WATCHDOG=1");
return TRUE;
}
/**
* watchdog_client_new:
* @timeout: The amount of time to wait in between notifications to systemd's watchdog.
*
* Creates a new watchdog and starts notifying systemd's watchdog every @timeout seconds.
*
* Returns: A new instance of #WatchdogClient.
*/
WatchdogClient *
watchdog_client_new (guint timeout)
{
return g_object_new (TYPE_WATCHDOG_CLIENT, "timeout", timeout, NULL);
}
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