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/*
* SPDX license identifier: MPL-2.0
*
* Copyright (C) 2011-2015, BMW AG
*
* This file is part of GENIVI Project DLT - Diagnostic Log and Trace.
*
* This Source Code Form is subject to the terms of the
* Mozilla Public License (MPL), 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/.
*
* For further information see http://www.genivi.org/.
*/
/*!
* \author
* Lassi Marttala <lassi.lm.marttala@partner.bmw.de>
* Alexander Wenzel <alexander.aw.wenzel@bmw.de>
* Markus Klein <Markus.Klein@esk.fraunhofer.de>
* Mikko Rapeli <mikko.rapeli@bmw.de>
*
* \copyright Copyright © 2011-2015 BMW AG. \n
* License MPL-2.0: Mozilla Public License version 2.0 http://mozilla.org/MPL/2.0/.
*
* \file dlt-system-watchdog.c
*/
#if defined(DLT_SYSTEMD_WATCHDOG_ENABLE)
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
#include <sys/timerfd.h>
#include "dlt.h"
#include "dlt-system.h"
#include "sd-daemon.h"
DLT_DECLARE_CONTEXT(watchdogContext)
DLT_IMPORT_CONTEXT(dltsystem)
extern DltSystemThreads threads;
typedef struct
{
int timer_fd;
unsigned long long wakeups_missed;
} PeriodicData;
void wait_period (PeriodicData *info)
{
unsigned long long missed;
if (read (info->timer_fd, &missed, sizeof (missed)) < 0)
DLT_LOG(watchdogContext, DLT_LOG_ERROR,
DLT_STRING("Could not read from timer file descriptor in watchdog.\n"));
if (missed > 0)
info->wakeups_missed += (missed - 1);
}
int make_periodic(unsigned int period, PeriodicData *info)
{
unsigned int ns;
unsigned int sec;
int fd;
struct itimerspec itval;
if (info == 0) {
DLT_LOG(watchdogContext, DLT_LOG_ERROR,
DLT_STRING("Invalid function parameters used for function make_periodic.\n"));
return -1;
}
/* Create the timer */
fd = timerfd_create (CLOCK_MONOTONIC, 0);
info->wakeups_missed = 0;
info->timer_fd = fd;
if (fd == -1) {
DLT_LOG(watchdogContext, DLT_LOG_ERROR,
DLT_STRING("Can't create timer filedescriptor.\n"));
return -1;
}
/* Make the timer periodic */
sec = period / 1000000;
ns = (period - (sec * 1000000)) * 1000;
itval.it_interval.tv_sec = sec;
itval.it_interval.tv_nsec = ns;
itval.it_value.tv_sec = sec;
itval.it_value.tv_nsec = ns;
return timerfd_settime (fd, 0, &itval, NULL);
}
void watchdog_thread(void *v_conf)
{
char str[512];
char *watchdogUSec;
unsigned int watchdogTimeoutSeconds;
unsigned int notifiyPeriodNSec;
PeriodicData info;
DLT_REGISTER_CONTEXT(watchdogContext, "DOG", "dlt system watchdog context.");
sleep(1);
DLT_LOG(watchdogContext, DLT_LOG_INFO, DLT_STRING("Watchdog thread started.\n"));
if (v_conf == 0) {
DLT_LOG(watchdogContext, DLT_LOG_ERROR,
DLT_STRING("Invalid function parameters used for function watchdog_thread.\n"));
return;
}
watchdogUSec = getenv("WATCHDOG_USEC");
if (watchdogUSec) {
DLT_LOG(watchdogContext, DLT_LOG_DEBUG, DLT_STRING("watchdogusec: "), DLT_STRING(watchdogUSec));
watchdogTimeoutSeconds = atoi(watchdogUSec);
if (watchdogTimeoutSeconds > 0) {
/* Calculate half of WATCHDOG_USEC in ns for timer tick */
notifiyPeriodNSec = watchdogTimeoutSeconds / 2;
snprintf(str,
512,
"systemd watchdog timeout: %u nsec - timer will be initialized: %u nsec\n",
watchdogTimeoutSeconds,
notifiyPeriodNSec);
DLT_LOG(watchdogContext, DLT_LOG_DEBUG, DLT_STRING(str));
if (make_periodic (notifiyPeriodNSec, &info) < 0) {
DLT_LOG(watchdogContext, DLT_LOG_ERROR, DLT_STRING("Could not initialize systemd watchdog timer\n"));
return;
}
while (1) {
if (sd_notify(0, "WATCHDOG=1") < 0)
DLT_LOG(watchdogContext, DLT_LOG_ERROR, DLT_STRING("Could not reset systemd watchdog\n"));
DLT_LOG(watchdogContext, DLT_LOG_DEBUG, DLT_STRING("systemd watchdog waited periodic\n"));
/* Wait for next period */
wait_period(&info);
}
}
else {
snprintf(str, 512, "systemd watchdog timeout incorrect: %u\n", watchdogTimeoutSeconds);
DLT_LOG(watchdogContext, DLT_LOG_DEBUG, DLT_STRING(str));
}
}
else {
DLT_LOG(watchdogContext, DLT_LOG_ERROR, DLT_STRING("systemd watchdog timeout (WATCHDOG_USEC) is null\n"));
}
}
#endif
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