libkeepalive
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block-suspend.c

Simple example to demonstrate use of cpukeepalive_t objects to block device from suspending.

Simple example to demonstrate use of cpukeepalive_t objects to block device from suspending.

/****************************************************************************************
**
** Copyright (C) 2014 - 2018 Jolla Ltd.
**
** Author: Simo Piiroinen <simo.piiroinen@jollamobile.com>
**
** All rights reserved.
**
** This file is part of nemo-keepalive package.
**
** You may use this file under the terms of the GNU Lesser General
** Public License version 2.1 as published by the Free Software Foundation
** and appearing in the file license.lgpl included in the packaging
** of this file.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation
** and appearing in the file license.lgpl included in the packaging
** of this file.
**
** 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.
**
****************************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <glib.h>
#include <dbus/dbus.h>
#include "../dbus-gmain/dbus-gmain.h"
#include <keepalive-glib/keepalive-cpukeepalive.h>
#include <assert.h>
#define failure(FMT, ARGS...) do {\
fprintf(stderr, "%s: "FMT"\n", __FUNCTION__, ## ARGS);\
exit(EXIT_FAILURE); \
} while(0)
static DBusConnection *system_bus = 0;
static GMainLoop *mainloop_handle = 0;
static void disconnect_from_systembus(void)
{
if( system_bus )
dbus_connection_unref(system_bus), system_bus = 0;
}
static void connect_to_system_bus(void)
{
DBusError err = DBUS_ERROR_INIT;
system_bus = dbus_bus_get(DBUS_BUS_SYSTEM, &err);
if( !system_bus )
failure("%s: %s", err.name, err.message);
dbus_gmain_set_up_connection(system_bus, 0);
dbus_error_free(&err);
}
static gboolean exit_timer_cb(gpointer aptr)
{
g_main_loop_quit(mainloop_handle);
return FALSE;
}
int main(int argc, char **argv)
{
(void)argc, (void)argv;
mainloop_handle = g_main_loop_new(0, 0);
connect_to_system_bus();
/* Create CPU-keepalive object */
cpukeepalive_t *cpukeepalive = cpukeepalive_new();
/* Schedule exit in 20 seconds */
g_timeout_add_seconds(20, exit_timer_cb, 0);
/* Start blocking suspend */
printf("BLOCK SUSPEND\n");
cpukeepalive_start(cpukeepalive);
/* Run mainloop (until timer expires) */
printf("ENTER MAINLOOP\n");
g_main_loop_run(mainloop_handle);
printf("LEAVE MAINLOOP\n");
/* Allow device to suspend again*/
printf("ALLOW SUSPEND\n");
cpukeepalive_stop(cpukeepalive);
/* Release CPU-keepalive object */
cpukeepalive_unref(cpukeepalive);
disconnect_from_systembus();
g_main_loop_unref(mainloop_handle);
return 0;
}
void cpukeepalive_stop(cpukeepalive_t *self)
cpukeepalive_t * cpukeepalive_new(void)
void cpukeepalive_start(cpukeepalive_t *self)
struct cpukeepalive_t cpukeepalive_t
Definition keepalive-cpukeepalive.h:50
void cpukeepalive_unref(cpukeepalive_t *self)