[Python] ctrl-C to terminate a pyqt application with a QOpenGLWidget

My main file for a pyqt application looks like this:

#!/usr/bin/env python3
from PyQt5.QtWidgets import QApplication

import signal
import sys

from main_window import MainWindow

if __name__ == "__main__":

signal.signal(signal.SIGINT, signal.SIG_DFL)

app = QApplication([])

window = MainWindow()
window.show()

app.exec()


It works, and when I ctrl-c in the terminal (on Ubuntu) the application will terminate...

...unless it creates a QOpenGLWidget, in which case ctrl-C does nothing.

I tried this

def signal_handler(signum, frame):
"""Handle SIGINT signal"""
print("\nReceived SIGINT, closing application...")
QApplication.instance().quit()

if __name__ == "__main__":
signal.signal(signal.SIGINT, signal_handler)
...


but signal_handler is never called.

How can I terminate a pyqt application using QOpenGLWidget using ctrl-C from the terminal?

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