Jul 1, 2025 · Jul 1, 2025
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
    If SIGINT was indeed caught, after exiting the on_signal() function the
    interpreter reacts to the signal according to the handler function which
    had been set up by a signal.signal() call; here, we arrange to call the
    backend-specific *handle_sigint* function.  Finally, we call the old SIGINT
    backend-specific *handle_sigint* function, passing the notifier object
    as returned by prepare_notifier().  Finally, we call the old SIGINT
    handler with the same arguments that were given to our custom handler.

    We do this only if the old handler for SIGINT was not None, which means
    Parameters
    ----------
    prepare_notifier : Callable[[socket.socket], object]
    handle_sigint : Callable[[], object]
    handle_sigint : Callable[[object], object]
    """

    old_sigint_handler = signal.getsignal(signal.SIGINT)
    notifier = prepare_notifier(rsock)

    def save_args_and_handle_sigint(*args):
        nonlocal handler_args
        nonlocal handler_args, notifier
        handler_args = args
        handle_sigint()
        handle_sigint(notifier)
        notifier = None

    signal.signal(signal.SIGINT, save_args_and_handle_sigint)
    try:
diff --git a/lib/matplotlib/backends/backend_qt.py b/lib/matplotlib/backends/backend_qt.py
                # be forgiving about reading an empty socket.
                pass

        return sn  # Actually keep the notifier alive.

    def handle_sigint():
        # We return the QSocketNotifier so that the caller holds a reference, and we
        # also explicitly clean it up in handle_sigint(). Without doing both, deletion
        # of the socket notifier can happen prematurely or not at all.
        return sn

    def handle_sigint(sn):
        sn.deleteLater()
        QtCore.QCoreApplication.sendPostedEvents(sn, QtCore.QEvent.Type.DeferredDelete)
        if hasattr(qapp_or_eventloop, 'closeAllWindows'):
            qapp_or_eventloop.closeAllWindows()
        qapp_or_eventloop.quit()
diff --git a/src/_macosx.m b/src/_macosx.m
 }

 static PyObject*
 stop(PyObject* self)
 stop(PyObject* self, PyObject* _ /* ignored */)
 {
    stopWithEvent();
    Py_RETURN_NONE;
            "written on the file descriptor given as argument.")},
        {"stop",
         (PyCFunction)stop,
 METH_NOARGS,
 METH_VARARGS,
         PyDoc_STR("Stop the NSApp.")},
        {"show",
         (PyCFunction)show,
Original file line number	Diff line number	Diff line change
Expand Up		@@ -1616,7 +1616,8 @@ def _allow_interrupt(prepare_notifier, handle_sigint):
		If SIGINT was indeed caught, after exiting the on_signal() function the
		interpreter reacts to the signal according to the handler function which
		had been set up by a signal.signal() call; here, we arrange to call the
		backend-specific handle_sigint function. Finally, we call the old SIGINT
		backend-specific handle_sigint function, passing the notifier object
		as returned by prepare_notifier(). Finally, we call the old SIGINT
		handler with the same arguments that were given to our custom handler.

		We do this only if the old handler for SIGINT was not None, which means
Expand All		@@ -1626,7 +1627,7 @@ def _allow_interrupt(prepare_notifier, handle_sigint):
		Parameters
		----------
		prepare_notifier : Callable[[socket.socket], object]
		handle_sigint : Callable[[], object]
		handle_sigint : Callable[[object], object]
		"""

		old_sigint_handler = signal.getsignal(signal.SIGINT)
Expand All		@@ -1642,9 +1643,10 @@ def _allow_interrupt(prepare_notifier, handle_sigint):
		notifier = prepare_notifier(rsock)

		def save_args_and_handle_sigint(*args):
		nonlocal handler_args
		nonlocal handler_args, notifier
		handler_args = args
		handle_sigint()
		handle_sigint(notifier)
		notifier = None

		signal.signal(signal.SIGINT, save_args_and_handle_sigint)
		try:
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -169,9 +169,14 @@ def _may_clear_sock():
		# be forgiving about reading an empty socket.
		pass

		return sn # Actually keep the notifier alive.

		def handle_sigint():
		# We return the QSocketNotifier so that the caller holds a reference, and we
		# also explicitly clean it up in handle_sigint(). Without doing both, deletion
		# of the socket notifier can happen prematurely or not at all.
		return sn

		def handle_sigint(sn):
		sn.deleteLater()
		QtCore.QCoreApplication.sendPostedEvents(sn, QtCore.QEvent.Type.DeferredDelete)
		if hasattr(qapp_or_eventloop, 'closeAllWindows'):
		qapp_or_eventloop.closeAllWindows()
		qapp_or_eventloop.quit()
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -258,7 +258,7 @@ static void lazy_init(void) {
		}

		static PyObject*
		stop(PyObject* self)
		stop(PyObject* self, PyObject* _ /* ignored */)
		{
		stopWithEvent();
		Py_RETURN_NONE;
Expand DownExpand Up		@@ -1863,7 +1863,7 @@ - (void)flagsChanged:(NSEvent *)event
		"written on the file descriptor given as argument.")},
		{"stop",
		(PyCFunction)stop,
		METH_NOARGS,
		METH_VARARGS,
		PyDoc_STR("Stop the NSApp.")},
		{"show",
		(PyCFunction)show,
Expand Down