From c3f485e194eb32939755178b11d472e1e69a94ad Mon Sep 17 00:00:00 2001
From: Ivan Alejandro <ivanalejandro0@gmail.com>
Date: Wed, 2 Jul 2014 16:43:58 -0300
Subject: Handle SIGINT/SIGTERM in processes.

---
 src/leap/bitmask/app.py | 36 ++++++++++++++++++++++++++++++++----
 1 file changed, 32 insertions(+), 4 deletions(-)

(limited to 'src/leap/bitmask/app.py')

diff --git a/src/leap/bitmask/app.py b/src/leap/bitmask/app.py
index d1a2a111..fa244470 100644
--- a/src/leap/bitmask/app.py
+++ b/src/leap/bitmask/app.py
@@ -44,6 +44,8 @@ import os
 import signal
 import sys
 
+from functools import partial
+
 from leap.bitmask.backend.utils import generate_certificates
 
 from leap.bitmask import __version__ as VERSION
@@ -109,12 +111,33 @@ def do_mail_plumbing(opts):
     # XXX catch when import is used w/o acct
 
 
+def sigterm_handler(logger, gui_process, backend_process, signum, frame):
+    """
+    Signal handler that quits the running app cleanly.
+
+    :param logger: the configured logger object.
+    :type logger: logging.Logger
+    :param gui_process: the GUI process
+    :type gui_process: multiprocessing.Process
+    :param backend_process: the backend process
+    :type backend_process: multiprocessing.Process
+    :param signum: number of the signal received (e.g. SIGINT -> 2)
+    :type signum: int
+    :param frame: current stack frame
+    :type frame: frame or None
+    """
+    logger.debug("SIGTERM catched, terminating processes.")
+    gui_process.terminate()
+    # Don't terminate the backend, the frontend takes care of that.
+    # backend_process.terminate()
+
+
 def start_app():
     """
     Starts the main event loop and launches the main window.
     """
-    # Ensure that the application quits using CTRL-C
-    signal.signal(signal.SIGINT, signal.SIG_DFL)
+    # Ignore the signals since we handle them in the subprocesses
+    # signal.signal(signal.SIGINT, signal.SIG_IGN)
 
     # Parse arguments and store them
     opts = leap_argparse.get_options()
@@ -181,13 +204,18 @@ def start_app():
     flags_dict = flags_to_dict()
 
     app = lambda: run_frontend(options, flags_dict)
-    gui_process = multiprocessing.Process(target=app)
+    gui_process = multiprocessing.Process(target=app, name='Frontend')
     gui_process.start()
 
     backend = lambda: run_backend(opts.danger, flags_dict)
-    backend_process = multiprocessing.Process(target=backend)
+    backend_process = multiprocessing.Process(target=backend, name='Backend')
     backend_process.start()
 
+    handle_sigterm = partial(sigterm_handler, logger,
+                             gui_process, backend_process)
+    signal.signal(signal.SIGTERM, handle_sigterm)
+    signal.signal(signal.SIGINT, handle_sigterm)
+
 
 if __name__ == "__main__":
     start_app()
-- 
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