Issue #12016: my_fgets() now always clears errors before calling fgets(). Fix

the following case: sys.stdin.read() stopped with CTRL+d (end of file),
raw_input() interrupted by CTRL+c.

Misc/NEWS

 Python News
 +++++++++++
 
+What's New in Python 2.7.3?
+===========================
+
+*Release date: XXXX-XX-XX*
+
+Core and Builtins
+-----------------
+
+- Issue #12016: my_fgets() now always clears errors before calling fgets(). Fix
+  the following case: sys.stdin.read() stopped with CTRL+d (end of file),
+  raw_input() interrupted by CTRL+c.
+
+Library
+-------
+
+
 What's New in Python 2.7.2?
 ===========================
 

Parser/myreadline.c

@@ -44,6 +44,7 @@ my_fgets(char *buf, int len, FILE *fp)
         if (PyOS_InputHook != NULL)
             (void)(PyOS_InputHook)();
         errno = 0;
+        clearerr(fp);
         p = fgets(buf, len, fp);
         if (p != NULL)
             return 0; /* No error */