feat: properly handle SIGINT (ctrl-c) in BEC GUI server -> calls qapplication.quit()

bec_widgets/cli/client_utils.py

@@ -93,7 +93,12 @@ def _start_plot_process(gui_id, gui_class, config) -> None:
     env_dict = os.environ.copy()
     env_dict["PYTHONUNBUFFERED"] = "1"
     process = subprocess.Popen(
-        command, text=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env_dict
+        command,
+        text=True,
+        start_new_session=True,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.PIPE,
+        env=env_dict,
     )
     process_output_processing_thread = threading.Thread(target=_get_output, args=(process,))
     process_output_processing_thread.start()

bec_widgets/cli/server.py

@@ -1,4 +1,5 @@
 import inspect
+import signal
 import sys
 from contextlib import redirect_stderr, redirect_stdout
 from typing import Union
@@ -200,6 +201,13 @@ def main():
 
             app.aboutToQuit.connect(server.shutdown)
 
+            def sigint_handler(*args):
+                # display message, for people to let it terminate gracefully
+                print("Caught SIGINT, exiting")
+                app.quit()
+
+            signal.signal(signal.SIGINT, sigint_handler)
+
             sys.exit(app.exec())