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diff --git a/contrib/gnunet_janitor.py.in b/contrib/gnunet_janitor.py.in
new file mode 100644
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+++ b/contrib/gnunet_janitor.py.in
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+#!@PYTHON@
+#    This file is part of GNUnet.
+#    (C) 2011 Christian Grothoff (and other contributing authors)
+#
+#    GNUnet is free software; you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published
+#    by the Free Software Foundation; either version 2, or (at your
+#    option) any later version.
+#
+#    GNUnet is distributed in the hope that it will be useful, but
+#    WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+#    General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with GNUnet; see the file COPYING.  If not, write to the
+#    Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+#    Boston, MA 02111-1307, USA.
+#
+# Finds any gnunet processes still running in the system and kills them
+#
+# gnunet janitor can be used by invoking `make' like this:
+# TESTS_ENVIRONMENT='${top_srcdir}/contrib/gnunet_janitor.py &&' make check
+
+from __future__ import print_function
+import os
+import re
+import subprocess
+import sys
+import shutil
+import time
+import signal
+
+if os.name == 'nt':
+  from win32com.client import GetObject
+  WMI = GetObject('winmgmts:')
+
+def get_process_list ():
+  result = []
+  if os.name == 'nt':
+    processes = WMI.InstancesOf('Win32_Process')
+    for p in processes:
+      result.append ((p.Properties_('ProcessId').Value, re.sub (r'(.+)\.exe', r'\1', p.Properties_('Name').Value)))
+  else:
+    pids = [pid for pid in os.listdir('/proc') if pid.isdigit ()]
+    for pid in pids:
+      result.append ((pid, open (os.path.join ('/proc', pid, 'comm'), 'rb').read ()))
+  return result
+
+def main ():
+  procs = get_process_list ()
+  gnunet_procs = []
+  for p in procs:
+    if re.match (r'gnunet-.+', p[1]):
+      gnunet_procs.append (p)
+  for p in gnunet_procs:
+    if re.match (r'gnunet-service-arm', p[1]):
+      print ("killing arm process {0:5} {1}".format (p[0], p[1]))
+      try:
+        os.kill (p[0], signal.SIGTERM)
+      except OSError as e:
+        print ("failed: {0}".format (e))
+        pass
+  for p in gnunet_procs:
+    if not re.match (r'gnunet-service-arm', p[1]):
+      print ("killing non-arm process {0:5} {1}".format (p[0], p[1]))
+      try:
+        os.kill (p[0], signal.SIGTERM)
+      except OSError as e:
+        print ("failed: {0}".format (e))
+        pass
+
+if __name__ == '__main__':
+  sys.exit (main ())