--- a/mercurial/cmdutil.py	Thu Nov 19 17:33:41 2009 -0500
+++ b/mercurial/cmdutil.py	Tue Nov 17 15:00:00 2009 +0900
@@ -571,7 +571,7 @@
         if parentfn:
             return parentfn(pid)
         else:
-            os._exit(0)
+            return
 
     if initfn:
         initfn()