diff -r 37751d1cb4a8 Parser/myreadline.c
--- a/Parser/myreadline.c	Tue Mar 27 07:46:46 2012 +0200
+++ b/Parser/myreadline.c	Thu Mar 29 17:04:56 2012 +0200
@@ -42,7 +42,10 @@
             (void)(PyOS_InputHook)();
         errno = 0;
         clearerr(fp);
-        p = fgets(buf, len, fp);
+        if (_PyVerify_fd(fileno(fp)))
+            p = fgets(buf, len, fp);
+        else
+            p = NULL;
         if (p != NULL)
             return 0; /* No error */
         err = errno;