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/**
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* \file qwatchdog.cpp
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*
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* \brief Keep tickling the watchdog so we don't reboot
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*
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* o 0
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* | / Copyright (c) 2005-2012
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* (CL)---o Critical Link, LLC
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* \
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* O
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#if defined (WIN32)
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#elif defined (__GNUC__)
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#include <linux/types.h>
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#include <linux/watchdog.h>
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#elif defined (_TMS320C6X)
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#endif
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#include "qwatchdog.h"
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#if defined(__GNUC__) // linux
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/**
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* @brief Constructor
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* @param anBarkMs Bark Rate (How often to Ping the System Watchdog)
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* @param apParent QT Parent Object
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*/
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tcQWatchDog::tcQWatchDog(int anBarkMs, QObject* apParent)
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: QObject(apParent)
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, mnBarkMs(anBarkMs)
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, mnFd(-1)
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, mnTimerId(-1)
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{
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mnBarkMs = mnBarkMs ?: 10000; // do not allow 0 interval
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if(!getenv("DISABLE_WATCHDOG"))
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{
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struct watchdog_info ident;
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mnFd = ::open("/dev/watchdog", O_WRONLY);
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if(0 < mnFd) // should actually end up >> 0
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{
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int interval = mnBarkMs*2/1000;
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int status = 0;
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memset(&ident, '\0', sizeof(ident));
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status = ioctl(mnFd, WDIOC_GETSUPPORT, &ident);
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if(0 != status)
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{
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qWarning("Unable to get watchdog info!:%s\n",strerror(errno));
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}
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else
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{
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qDebug("Watchdog:%s - v%08x - opts = 0x%08x\n",
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ident.identity, ident.firmware_version, ident.options);
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}
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status = ioctl(mnFd, WDIOC_SETTIMEOUT, &interval);
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if(0 != status)
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{
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qWarning("Unable to set watchdog timeout!:%s\n",strerror(errno));
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}
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interval = -1;
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status = ioctl(mnFd, WDIOC_GETTIMEOUT, &interval);
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if((0 == status) && (interval*1000) < (mnBarkMs*2))
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mnBarkMs = interval * 500; // set WD timeout to 1/2 interval
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qDebug("Watchdog timeout set to %dms [%dms requested]\n", mnBarkMs, anBarkMs);
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if(0 == status)
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mnTimerId = startTimer(mnBarkMs);
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}
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else
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{
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qWarning("Unable to open /dev/watchdog!:%s\n",strerror(errno));
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}
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}
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else
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{
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qWarning("Watchdod disabled.. DISABLE_WATCHDOG env var set\n");
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}
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}
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/**
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* @brief Destructor
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*/
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tcQWatchDog::~tcQWatchDog()
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{
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if(-1 != mnTimerId)
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killTimer(mnTimerId);
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if(-1 != mnFd)
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::close(mnFd);
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}
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/**
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* @brief Sends Ping to System Watchdog
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*/
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void tcQWatchDog::timerEvent(QTimerEvent *)
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{
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//bark
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int dummy = 1;
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ioctl(mnFd, WDIOC_KEEPALIVE, &dummy);
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}
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#else
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// no watchdog on windows
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/**
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* \brief Constructor
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*
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* \param anBarkMs Bark Rate (How often to Ping the System Watchdog)
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* \param apParent Pointer to parent QT Object
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*/
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tcQWatchDog::tcQWatchDog(int anBarkMs, QObject* apParent)
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: QObject(apParent)
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, mnBarkMs(anBarkMs)
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, mnFd(-1)
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{
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qWarning("No watchdog support on this platform\n");
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}
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/**
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* \brief Destructor
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*/
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tcQWatchDog::~tcQWatchDog()
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{
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}
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/**
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* \brief Timer Event does nothing for Windows
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*/
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void tcQWatchDog::timerEvent(QTimerEvent *)
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{
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}
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#endif // __GNUC__
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#ifdef WATCHDOG_UT
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#include <iostream>
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#include <QStringList>
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#include <QtCore/QDebug>
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#include <QtCore/QCoreApplication>
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class CMyApp : public QCoreApplication
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{
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public:
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CMyApp(int ms, int argc, char** argv);
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protected:
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void timerEvent(QTimerEvent*);
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};
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CMyApp::CMyApp(int ms , int argc, char** argv)
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: QCoreApplication (argc, argv)
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{
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printf("My App here... printing a \'.\' every %d sec\n",ms/10000);
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startTimer(ms);
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}
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void CMyApp::timerEvent(QTimerEvent*)
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{
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printf(".");
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fflush(stdout);
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}
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int main(int argc, char** argv)
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{
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CMyApp a(10000, argc, argv);
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qDebug() << "Building watchdog...";
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tcQWatchDog woof;
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qDebug() << "Entering main loop... reboot comin!";
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return a.exec();
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}
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#endif // WATCHDOG_UT
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