Do not try to install signal handler if unsupported (Fixes #199)

miguelgrinberg · Oct 7, 2020 · c0a1c28 · c0a1c28
1 parent e6fb095
commit c0a1c28
Showing 1 changed file with 8 additions and 3 deletions.
diff --git a/engineio/asyncio_client.py b/engineio/asyncio_client.py
@@ -87,9 +87,14 @@ async def connect(self, url, headers=None, transports=None,
         global async_signal_handler_set
         if not async_signal_handler_set and \
                 threading.current_thread() == threading.main_thread():
-            asyncio.get_event_loop().add_signal_handler(signal.SIGINT,
-                                                        async_signal_handler)
-            async_signal_handler_set = True
+
+            try:
+                asyncio.get_event_loop().add_signal_handler(
+                    signal.SIGINT, async_signal_handler)
+                async_signal_handler_set = True
+            except NotImplementedError:  # pragma: no cover
+                self.logger.warning('Signal handler is unsupported')
+
         if self.state != 'disconnected':
             raise ValueError('Client is not in a disconnected state')
         valid_transports = ['polling', 'websocket']