--- Coherence-0.6.6.2.orig/bin/coherence	2010-01-02 16:10:19.000000000 +0100
+++ Coherence-0.6.6.2/bin/coherence	2013-05-19 01:25:58.069676227 +0200
@@ -33,6 +33,14 @@
     if os.fork():   # launch child and...
         os._exit(0) # kill off parent again.
     os.umask(077)
+
+    pidfile = open('/run/coherence.pid', 'a+')
+    pidfile.truncate()
+    pidfile.write(str(os.getpid()))
+    pidfile.flush()
+    pidfile.seek(0)
+    pidfile.close()
+
     null=os.open('/dev/null', os.O_RDWR)
     for i in range(3):
         try: