fix sigint handling

src/dailyai/services/base_transport_service.py

@@ -91,6 +91,8 @@ class BaseTransportService():
             self._receive_audio_thread.join()
 
     def _post_run(self):
+        # Note that this function must be idempotent! It can be called multiple times
+        # if, for example, a keyboard interrupt occurs.
         pass
 
     def stop(self):

src/dailyai/services/daily_transport_service.py

@@ -194,10 +194,13 @@ class DailyTransportService(BaseTransportService, EventHandler):
         if self._token and self._start_transcription:
             self.client.start_transcription(self.transcription_settings)
 
+        self.original_sigint_handler = signal.getsignal(signal.SIGINT)
         signal.signal(signal.SIGINT, self.process_interrupt_handler)
 
     def process_interrupt_handler(self, signum, frame):
         self._post_run()
+        if callable(self.original_sigint_handler):
+            self.original_sigint_handler(signum, frame)
 
     def _post_run(self):
         self.client.leave()