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#include "cpuload.h"
#include <QStringList>
CpuLoad::CpuLoad() :
_lastLoad(0),
_lastTotal(0),
_file("/proc/stat")
{
// TODO Auto-generated constructor stub
}
CpuLoad::~CpuLoad() {
// TODO Auto-generated destructor stub
}
qint64 CpuLoad::read()
{
static QChar space(' ');
if (!_file.open(QIODevice::ReadOnly)) {
return -1;
}
char buffer[500];
_file.readLine(buffer, sizeof(buffer));
_file.close();
QString line(buffer);
QStringList list = line.split(space, QString::SkipEmptyParts);
if (list.length() < 8) {
return -1;
}
// "cpu", user, nice, system, idle, iowait, irq, softirq
qint64 load = 0, total = 0;
for (int i = 1; i < 8; ++i) {
const qint64 value = list.at(i).toLongLong();
if (i < 4 || i > 5) {
load += value;
}
total += value;
}
const qint64 ret = ((load - _lastLoad) * 1000) / (total - _lastTotal);
_lastTotal = total;
_lastLoad = load;
return ret;
}
const QList<qint64>& CpuLoad::getBars() const
{
static QList<qint64> list;
return list;
}
qint64 CpuLoad::getMaximum()
{
return 1000;
}
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