From 98a8231cef0e94eb7cc1f6c43dd5224db379d550 Mon Sep 17 00:00:00 2001
From: Bob Lantz <rlantz@cs.stanford.edu>
Date: Fri, 23 Jan 2015 16:43:49 -0800
Subject: [PATCH] Exit poll loop on POLLHUP or anything unexpected

In my opinion, we really shouldn't even get POLLHUP, but
we do. In case we get anything else odd, quite polling on
that fd.
---
 mininet/util.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mininet/util.py b/mininet/util.py
index 4b6e628..a655f7d 100644
--- a/mininet/util.py
+++ b/mininet/util.py
@@ -105,7 +105,7 @@ def errRun( *cmd, **kwargs ):
                     err += data
                     if data == '':
                         errDone = True
-            elif event & POLLHUP:
+            else:  # POLLHUP or something unexpected
                 if f == popen.stdout:
                     outDone = True
                 elif f == popen.stderr: