ctrl: send termination signals to the process group

riotctrl/ctrl.py

@@ -6,6 +6,7 @@
 import abc
 import os
 import time
+import signal
 import logging
 import subprocess
 import contextlib
@@ -179,7 +180,14 @@ def stop_term(self):
 
         Handles possible exceptions.
         """
+        if self._term_pid() is None:
+            return
+
         try:
+            # Native will spawn more than one process, so send the signals
+            # to the process group instead of the process.
+            os.killpg(self._term_pid(), signal.SIGHUP)
+            os.killpg(self._term_pid(), signal.SIGINT)
             self.term.close()
         except AttributeError:
             # Not initialized

setup.cfg

@@ -10,6 +10,7 @@ markers =
 [pylint]
 reports = no
 max-line-length = 88
+max-positional-arguments = 6
 disable = locally-disabled,consider-using-f-string,invalid-name,too-few-public-methods
 msg-template = {path}:{line}: [{msg_id}({symbol}), {obj}] {msg}