From 49d84f7cfc08b7ffe28a0890baf11aed985e8bf2 Mon Sep 17 00:00:00 2001
From: Bob Lantz <rlantz@cs.stanford.edu>
Date: Thu, 10 May 2012 17:35:34 -0700
Subject: [PATCH] Fix poller to only check if stdin and node are readable.
 Fixes busy waiting and excessive CPU usage in CLI. Thanks to James Zeng for
 pointing this out!

---
 mininet/cli.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mininet/cli.py b/mininet/cli.py
index 3fbedd1..5843e95 100644
--- a/mininet/cli.py
+++ b/mininet/cli.py
@@ -319,8 +319,8 @@ class CLI( Cmd ):
         nodePoller = poll()
         nodePoller.register( node.stdout )
         bothPoller = poll()
-        bothPoller.register( self.stdin )
-        bothPoller.register( node.stdout )
+        bothPoller.register( self.stdin, POLLIN )
+        bothPoller.register( node.stdout, POLLIN )
         if self.isatty():
             # Buffer by character, so that interactive
             # commands sort of work