glib_events: optionally retain GLib override SIGINT handler

... as this also appromixates asyncio KeyboardInterrupt SIGINT behavior.
Otherwise, one tends to get stuck in mainloop without convenient
escape hatch.

Author: mnauw

asyncio_glib/glib_events.py

@@ -15,10 +15,10 @@
 class GLibEventLoop(asyncio.SelectorEventLoop):
     """An asyncio event loop that runs the GLib main loop"""
 
-    def __init__(self, main_context=None):
+    def __init__(self, main_context=None, handle_sigint=False):
         if main_context is None:
             main_context = GLib.MainContext.default()
-        selector = glib_selector.GLibSelector(main_context)
+        selector = glib_selector.GLibSelector(main_context, handle_sigint)
         self.selector = selector
         super().__init__(selector)
 

asyncio_glib/glib_selector.py

@@ -67,10 +67,15 @@ def clear(self):
 
 class GLibSelector(selectors._BaseSelectorImpl):
 
-    def __init__(self, context):
+    def __init__(self, context, handle_sigint=False):
         super().__init__()
         self._context = context
-        self._main_loop = GLib.MainLoop.new(self._context, False)
+        if handle_sigint:
+            self._main_loop = GLib.MainLoop()
+            self._run = GLib.MainLoop.run
+        else:
+            self._main_loop = GLib.MainLoop.new(self._context, False)
+            self._run = g_main_loop_run
         self._source = _SelectorSource(self._main_loop)
         self._source.attach(self._context)
 
@@ -100,7 +105,7 @@ def select(self, timeout=None):
 
         self._source.clear()
         if may_block:
-            g_main_loop_run(self._main_loop)
+            self._run(self._main_loop)
         else:
             self._context.iteration(False)