Follow termination of our children only

cotyledon/__init__.py

@@ -267,12 +267,15 @@ class ServiceManager(object):
         os.killpg(0, signal.SIGTERM)
 
         LOG.debug("Waiting services to terminate")
-        while True:
+        # NOTE(sileht): We follow the termination of our children only
+        # so we can't use waitpid(0, 0)
+        for conf in self._services:
+            for pid in self._running_services[conf]:
                 try:
-                os.waitpid(0, 0)
+                    os.waitpid(pid, 0)
                 except OSError as e:
                     if e.errno == errno.ECHILD:
-                    break
+                        pass
                     else:
                         raise