Re: interacting with logind to detect user idle time

[Germano Massullo <germano.massullo@xxxxxxxxx>]

Good day.
I have noticed that on many Linux distributions with different desktop
environments, the properties
IdleSinceHint
IdleSinceHintMonotonic
are always equal to zero. This happens even if you try to use a sleep
in order to simulate a kind of user inactivity.
What is this happening?
I have written a little piece of code that is able to print on
standard output the IdleSinceHint

Thank you!

/*
 * Compile with:
 *   gcc -Wall print_user_idle_time.c -o print_user_idle_time `pkg-config --libs gio-2.0 --cflags`
 */

#include <gio/gio.h>

static void
print_user_idle_time (GDBusProxy *proxy)
{
    guint64 user_idle_time;
    gchar *property = "IdleSinceHint";
	GError *error = NULL;
	GVariant *ret = NULL;

    sleep(2);
    
	ret = g_dbus_proxy_get_cached_property(proxy, property);
	if (!ret) {
		g_dbus_error_strip_remote_error (error);
		g_print ("IdleSinceHint failed: %s\n", error->message);
		g_error_free (error);
		return;
	}

	user_idle_time = g_variant_get_uint64 (ret);
    /*
	/g_variant_get (ret, "(^ao)", &user_idle_time);
	has been replaced with
	user_idle_time = g_variant_get_uint64 (ret);
	*/
	g_print("%lu\n", user_idle_time);
    g_variant_unref (ret);
}

int
main (int argc, char *argv[])
{
	GDBusProxy *proxy = NULL;
    gchar *name = "org.freedesktop.login1";
    gchar *object_path = "/org/freedesktop/login1";
    gchar *interface_name = "org.freedesktop.login1.Manager";
	/* Create a D-Bus proxy */
	proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
	                                       G_DBUS_PROXY_FLAGS_NONE,
	                                       NULL,
	                                       name,
	                                       object_path,
	                                       interface_name,
	                                       NULL, NULL);
	g_assert (proxy != NULL);

	print_user_idle_time (proxy);

	g_object_unref (proxy);

	return 0;
}

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