Catching unix interrupt signal on console application when debugging with QtCreator

[Damien]

Hi,

I have a console application which in a very stripped version looks like this:

#include <QCoreApplication>
#include <QDebug>

static int exit_flag = 0; 

static void sigexit(int sig)
{
    Q_UNUSED(sig);
    exit_flag = 1;
    QCoreApplication::exit(exit_flag);
}


int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    int error = 0;

    qDebug() << "Application started";
    
    // Do something interresting...

    signal(SIGTERM, sigexit); // catch kill signal
    signal(SIGHUP, sigexit);  // catch hang up signal
    signal(SIGQUIT, sigexit); // catch quit signal
    signal(SIGINT, sigexit);  // catch a CTRL-c signal

    error = a.exec();
    
    // Do some cleanup ...
    qDebug() << "Application will exit now";

    return error;
}

If I run the application directly in console, I'm able to interrupt the process and the application closes down gracefully.

Meanwhile, if I debug the application in QtCreator and type CTRL-c, the debugger breaks in qeventdispatcher_glib.cpp QEventDispatcherGlib::processEvents. If I press F5 to continue, the application keeps running and never exits.

Any ideas how I could fix that?

Thanks,
-Damien

[JonB]

@Damien
Qt Creator (I don't use it, so don't ask me for more information!) is trapping this for you to be helpful :) IIRC, gdb stops on a signal and then you can either proceed re-raising the signal or ignoring the signal, which sounds a bit like what you say F5 is doing. Have a look at https://stackoverflow.com/questions/19409573/qt-creator-stops-on-linux-signal to see if the setting mentioned there helps you? Or don't press F5! :)

[Damien]

@JonB said in Catching unix interrupt signal on console application when debugging with QtCreator:

s a bit like what you say F5 is doin

Thanks @JonB.

I got around the issue by adding pass nonstop noprint configuration for the required signals in Tools > Options > Debugger > Locals & Expression > Debugging Helper Customization.