QtAsyncio: Catch keyboard interrupts

Catch keyboard interrupts by catching the SIGINT signal and handling
it with the default handler. Register the handler with the
QAsyncioEventLoopPolicy so that this is always done when using
QtAsyncio.

Pick-to: 6.6
Task-number: PYSIDE-769
Change-Id: I7b35367a50ab03eb014faabf6b6a3b21a6a3cd6c
Reviewed-by: Cristian Maureira-Fredes <[email protected]>
Reviewed-by: Friedemann Kleint <[email protected]>

5 files changed, 6 insertions, 9 deletions

diff --git a/examples/async/eratosthenes/eratosthenes_asyncio.py b/examples/async/eratosthenes/eratosthenes_asyncio.py
index 0cb419817..f24a06145 100644
--- a/examples/async/eratosthenes/eratosthenes_asyncio.py
+++ b/examples/async/eratosthenes/eratosthenes_asyncio.py
@@ -8,7 +8,6 @@ from PySide6.QtWidgets import (QApplication, QGridLayout, QLabel, QMainWindow, Q
 from PySide6.QtAsyncio import QAsyncioEventLoopPolicy
 
 import asyncio
-import signal
 import sys
 from random import randint
 
@@ -132,8 +131,6 @@ if __name__ == "__main__":
 
     main_window.show()
 
-    signal.signal(signal.SIGINT, signal.SIG_DFL)
-
     asyncio.set_event_loop_policy(QAsyncioEventLoopPolicy())
     asyncio.ensure_future(eratosthenes.start())
     asyncio.get_event_loop().run_forever()
diff --git a/examples/async/minimal/minimal_asyncio.py b/examples/async/minimal/minimal_asyncio.py
index a66e07ef6..4e6f712c3 100644
--- a/examples/async/minimal/minimal_asyncio.py
+++ b/examples/async/minimal/minimal_asyncio.py
@@ -7,7 +7,6 @@ from PySide6.QtWidgets import (QApplication, QLabel, QMainWindow, QPushButton, Q
 from PySide6.QtAsyncio import QAsyncioEventLoopPolicy
 
 import asyncio
-import signal
 import sys
 
 
@@ -60,7 +59,5 @@ if __name__ == "__main__":
 
     main_window.show()
 
-    signal.signal(signal.SIGINT, signal.SIG_DFL)
-
     asyncio.set_event_loop_policy(QAsyncioEventLoopPolicy())
     asyncio.get_event_loop().run_forever()
diff --git a/sources/pyside6/PySide6/QtAsyncio/events.py b/sources/pyside6/PySide6/QtAsyncio/events.py
index d9bbfc955..c570676cb 100644
--- a/sources/pyside6/PySide6/QtAsyncio/events.py
+++ b/sources/pyside6/PySide6/QtAsyncio/events.py
@@ -12,6 +12,7 @@ import concurrent.futures
 import contextvars
 import enum
 import os
+import signal
 import socket
 import subprocess
 import typing
@@ -64,6 +65,8 @@ class QAsyncioEventLoopPolicy(asyncio.AbstractEventLoopPolicy):
         self._application: QCoreApplication = application  # type: ignore[assignment]
         self._event_loop: typing.Optional[asyncio.AbstractEventLoop] = None
 
+        signal.signal(signal.SIGINT, signal.SIG_DFL)
+
     def get_event_loop(self) -> asyncio.AbstractEventLoop:
         if self._event_loop is None:
             self._event_loop = QAsyncioEventLoop(self._application)
diff --git a/sources/pyside6/PySide6/QtAsyncio/futures.py b/sources/pyside6/PySide6/QtAsyncio/futures.py
index 7ed8bcb64..f4ac2c561 100644
--- a/sources/pyside6/PySide6/QtAsyncio/futures.py
+++ b/sources/pyside6/PySide6/QtAsyncio/futures.py
@@ -33,7 +33,7 @@ class QAsyncioFuture():
 
         self._state = QAsyncioFuture.FutureState.PENDING
         self._result: typing.Any = None
-        self._exception: typing.Optional[Exception] = None
+        self._exception: typing.Optional[BaseException] = None
 
         self._callbacks: typing.List[typing.Callable] = list()
 
@@ -103,7 +103,7 @@ class QAsyncioFuture():
         self._schedule_callbacks()
         return True
 
-    def exception(self) -> typing.Optional[Exception]:
+    def exception(self) -> typing.Optional[BaseException]:
         if self._state == QAsyncioFuture.FutureState.CANCELLED:
             raise asyncio.CancelledError
         if self.done():
diff --git a/sources/pyside6/PySide6/QtAsyncio/tasks.py b/sources/pyside6/PySide6/QtAsyncio/tasks.py
index 78f9dfb0c..c8e7da7e4 100644
--- a/sources/pyside6/PySide6/QtAsyncio/tasks.py
+++ b/sources/pyside6/PySide6/QtAsyncio/tasks.py
@@ -88,7 +88,7 @@ class QAsyncioTask(futures.QAsyncioFuture):
             self._exception = e
         except BaseException as e:
             self._state = futures.QAsyncioFuture.FutureState.DONE_WITH_EXCEPTION
-            self._exception = e  # type: ignore[assignment]
+            self._exception = e
         else:
             if asyncio.futures.isfuture(result):
                 result.add_done_callback(