Index: Lib/subprocess.py
===================================================================
--- Lib/subprocess.py	(revision 88499)
+++ Lib/subprocess.py	(working copy)
@@ -1065,11 +1065,16 @@
 
 
         def _close_fds(self, but):
+            maxfd = MAX_FD
+            try:
+                maxfd = os.dup(0) + 1
+            except:
+                pass
             if hasattr(os, 'closerange'):
                 os.closerange(3, but)
-                os.closerange(but + 1, MAXFD)
+                os.closerange(but + 1, maxfd)
             else:
-                for i in xrange(3, MAXFD):
+                for i in xrange(3, maxfd):
                     if i == but:
                         continue
                     try:
Index: Lib/popen2.py
===================================================================
--- Lib/popen2.py	(revision 88499)
+++ Lib/popen2.py	(working copy)
@@ -82,8 +82,13 @@
     def _run_child(self, cmd):
         if isinstance(cmd, basestring):
             cmd = ['/bin/sh', '-c', cmd]
-        os.closerange(3, MAXFD)
+        maxfd = MAXFD
         try:
+            maxfd = os.dup(0) + 1
+        except:
+            pass
+        os.closerange(3, maxfd)
+        try:
             os.execvp(cmd[0], cmd)
         finally:
             os._exit(1)