Wednesday, April 11, 2018

I've got a snippet here, saying it all about mirai virus

/*
=================================================================================
Name : wdt_test.c
Version : 0.1
Copyright (C) 2012 by Andre Wussow, 2012, desk@binerry.de
Description :
A simple test for working with the Raspberry Pi BCM2835 Watchdog.
References :
http://binerry.de/post/28263824530/raspberry-pi-watchdog-timer
================================================================================
This sample 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 sample 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 <fcntl.h>
#include <linux/watchdog.h>
int main (int argc, char *argv[])
{
// print infos
printf("Raspberry Pi BCM2835 Watchdog Sample\n");
printf("========================================\n");
int deviceHandle;
int disableWatchdog = 1;
// test watchdog reset via t-param
if (argc > 1) {
if (!strncasecmp(argv[1], "-t", 2)) {
disableWatchdog = 0;
}
}
printf("Disabling watchdog before closing device: %d\n", disableWatchdog);
// open watchdog device on /dev/watchdog
if ((deviceHandle = open("/dev/watchdog", O_RDWR | O_NOCTTY)) < 0) {
printf("Error: Couldn't open watchdog device! %d\n", deviceHandle);
return 1;
}
// get timeout info of watchdog (try to set it to 15s before)
int timeout = 15;
ioctl(deviceHandle, WDIOC_SETTIMEOUT, &timeout);
ioctl(deviceHandle, WDIOC_GETTIMEOUT, &timeout);
printf("The watchdog timeout is %d seconds.\n\n", timeout);
// feed watchdog 3 times with heartbeats
int i;
for (i = 0; i < 3; i++) {
printf("Feeding the dog with a heartbeat.\n");
ioctl(deviceHandle, WDIOC_KEEPALIVE, 0);
sleep(10);
}
if (disableWatchdog)
{
printf("Disable watchdog.\n");
write(deviceHandle, "V", 1);
}
// close connection and return
close(deviceHandle);
return 0;
} https://github.com/binerry/RaspberryPi/blob/master/snippets/c/watchdog/wdt_test.c

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