Add default Python signal handler for all signals registered.

By default, and only in certain circumstances, SIGINT is the only signal
with a handler installed. All others will perform their function defined
by SIG_DFL, which is to ignore is some cases, and to terminate in others. In
either case, Python will never see them and be unable to pass them to
the async handler.

Signed-off-by: <[email protected]>
Signed-off-by: Cian Donovan <[email protected]>

Author: ciandonovan

launch/launch/utilities/signal_management.py

@@ -235,6 +235,7 @@ def handle(
         :return: previous handler if any, otherwise None
         """
         signum = signal.Signals(signum)
+        signal.signal(signum, signal.default_int_handler)
         if handler is not None:
             if not callable(handler):
                 raise ValueError('signal handler must be a callable')