#include <qcoreapplication.h>
#include <qsharedmemory.h>
#include <qprocess.h>
#include <iostream>

using namespace std;

QSharedMemory region;
int parent(int argc, char** argv)
{
    QCoreApplication app(argc, argv);
    QProcess process;
    QStringList args = { "child"};

    
    cout << "I am the parent" << endl;
    region.setKey("myregion");
    region.create(1024);
    assert(region.isAttached());
    process.setProcessChannelMode(QProcess::ForwardedChannels);
    process.start("qsharedmemory_test", args);
    process.waitForFinished();
    region.lock(); // this will never return
    app.exec();
    return 0;
}

int child(int argc, char** argv)
{
    QCoreApplication app(argc, argv);
    int* crash = nullptr;

    cout << "I am the child" << endl;
    region.setKey("myregion");
    region.attach();
    region.lock();
    // intentionally crash
    *crash = 5;
    assert(region.isAttached());
    app.exec();
    return 0;
}

int main(int argc, char** argv)
{
    
    if (argc < 2) {
        cout << "Missing argument" << endl;
        exit(EXIT_FAILURE);
    }
    ;
    if (!strcmp(argv[1], "parent"))
        return parent(argc, argv);
    else if (!strcmp(argv[1], "child"))
        return child(argc, argv);
    else {
        cout << "Unexpected argument";
        exit(EXIT_FAILURE);
    }
}