Add check for EINTR during example testing; this should help avoid sporadic test failures on travis

examples/utils.py

@@ -3,6 +3,7 @@ import subprocess
 import time
 import os
 import sys
+import errno
 from pyqtgraph.pgcollections import OrderedDict
 from pyqtgraph.python2_3 import basestring
 
@@ -143,7 +144,14 @@ except:
     output = ''
     fail = False
     while True:
-        c = process.stdout.read(1).decode()
+        try:
+            c = process.stdout.read(1).decode()
+        except IOError as err:
+            if err.errno == errno.EINTR:
+                # Interrupted system call; just try again.
+                c = ''
+            else:
+                raise
         output += c
         #sys.stdout.write(c)
         #sys.stdout.flush()