added example how to register callback for shutdown

examples/client-shutdown-callback.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+# PYTHON_ARGCOMPLETE_OK
+
+import sys
+import jack
+import time
+import argparse
+from gi.repository import GLib
+
+def shutdown(client, reason, loop):
+    print(reason)
+    loop.quit()
+
+def run():
+
+    loop = GLib.MainLoop()
+
+    client = jack.Client('client shutdown callback example');
+    client.set_shutdown_callback(shutdown, loop)
+    client.activate();
+
+    print('client name: ' + client.get_name())
+
+    try:
+        loop.run()
+    except KeyboardInterrupt:
+        print('keyboard interrupt')
+
+def _init_argparser():
+
+    argparser = argparse.ArgumentParser(description = None)
+    return argparser
+
+def main(argv):
+
+    argparser = _init_argparser()
+    try:
+        import argcomplete
+        argcomplete.autocomplete(argparser)
+    except ImportError:
+        pass
+    args = argparser.parse_args(argv)
+
+    run(**vars(args))
+
+    return 0
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv[1:]))