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Georg Brandl committed 4856395

#316: broader range of exceptions to catch while communicating with subprocess.

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sphinx/ext/graphviz.py

         # Graphviz may close standard input when an error occurs,
         # resulting in a broken pipe on communicate()
         stdout, stderr = p.communicate(code)
-    except OSError, err:
+    except (OSError, IOError), err:
         if err.errno != EPIPE:
             raise
         # in this case, read the standard output and standard error streams