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/*
processtracker_linux.cpp
This file is part of GammaRay, the Qt application inspection and manipulation tool.
SPDX-FileCopyrightText: 2016 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
Author: Filipe Azevedo <filipe.azevedo@kdab.com>
SPDX-License-Identifier: GPL-2.0-or-later
Contact KDAB at <info@kdab.com> for commercial licensing options.
*/
// A said crossplatform way (using ptrace) is available at
// https://forum.juce.com/t/detecting-if-a-process-is-being-run-under-a-debugger/2098
#include "processtracker_linux.h"
#include <QFile>
#include <QStringList>
#include <QStringDecoder>
namespace {
static QString readFile(const QString &filePath, const QByteArray &codec = QByteArrayLiteral("UTF-8"))
{
QFile file(filePath);
if (!file.exists()) {
qWarning("%s: File does not exists", Q_FUNC_INFO);
return QString();
}
if (!file.open(QIODevice::ReadOnly)) {
qWarning("%s: File can not be opened", Q_FUNC_INFO);
return QString();
}
return QStringDecoder(codec).decode(file.readAll());
}
}
using namespace GammaRay;
ProcessTrackerBackendLinux::ProcessTrackerBackendLinux(QObject *parent)
: GammaRay::ProcessTrackerBackend(parent)
{
}
void ProcessTrackerBackendLinux::checkProcess(qint64 pid)
{
GammaRay::ProcessTrackerInfo pinfo(pid);
QString buffer(readFile(QString::fromLatin1("/proc/%1/status").arg(pid)));
if (!buffer.isEmpty()) {
const QStringList values = buffer.remove(QLatin1Char('\t')).split(QLatin1Char('\n'));
for (const QString &value : values) {
if (value.startsWith(QStringLiteral("TracerPid:"))) {
pinfo.traced = value.split(QLatin1Char(':')).value(1).simplified().toLongLong();
} else if (value.startsWith(QStringLiteral("State:"))) {
const char status(value.split(QLatin1Char(':')).value(1).simplified()[0].toUpper().toLatin1());
// status decoding as taken from fs/proc/array.c
switch (status) {
case 'T': {
pinfo.state = GammaRay::ProcessTracker::Suspended;
break;
}
case 'S': // Sleeping
case 'R': {
pinfo.state = GammaRay::ProcessTracker::Running;
break;
}
// case 'Z': // Zombie
// case 'D': // Disk Sleep
// case 'W': // Paging
}
}
}
}
emit processChecked(pinfo);
}
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