#include <QtWidgets/QApplication>
#include <QtCore/QDebug>
#include <QtWidgets/QLayout>
#include <QtCore/QObject>
#include <QtCore/QProcess>
#include <QtWidgets/QPushButton>
#include <QtWidgets/QWidget>


class MyWidget : public QWidget
{
private:
    QProcess *proc;

public Q_SLOTS:
    void onClicked()
    {
        proc = new QProcess;
        QObject::connect(proc, &QProcess::started, this, []() { qDebug() << "Process started"; } );
        QObject::connect(proc, QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished), this, []() { qDebug() << "Process finished"; } );
        //qDebug() << "SKDBG1: " << proc->processEnvironment().toStringList();
        //qDebug() << "SKDBG2: " << QProcessEnvironment::systemEnvironment().toStringList();
        proc->start("sleep", { "1"} );
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MyWidget w;
    w.setLayout(new QVBoxLayout);
    QPushButton *pb = new QPushButton("QProcess");
    w.layout()->addWidget(pb);
    w.show();

    QObject::connect(pb, &QPushButton::clicked, &w, &MyWidget::onClicked);

    return a.exec();
}