How to detect if qt application exited normally or not?

Question

I have a Qt application (non-GUI) running. I want to know the state in which my application exited so I can either restart it or mark it as completed successfully. Think of it as a simple shell script that wants to know this.

I'm using QCoreApplication::exit(errorCode) to exit the application but I'm not sure how and where to read this value.

Answer 1

QCoreApplication::exit(errorCode) exits the event loop with a return value of errorCode.

int main(int argc, char**argv)
{
    QCoreApplication a(argc, argv);
    return a.exec();
}
...
a.exit(errorCode)

returns errorCode from the application

If you are using bash as a shell you can find the exit code of the last application in $?

bash$ echo $?
0