diff -r 5a8301002f5a Modules/spwdmodule.c
--- a/Modules/spwdmodule.c	Thu Jan 09 21:41:23 2014 -0600
+++ b/Modules/spwdmodule.c	Fri Jan 10 17:58:46 2014 +0800
@@ -153,6 +153,8 @@
     if ((d = PyList_New(0)) == NULL)
         return NULL;
     setspent();
+    if (errno != 0)
+        return PyErr_SetFromErrno(PyExc_OSError);
     while ((p = getspent()) != NULL) {
         PyObject *v = mkspent(p);
         if (v == NULL || PyList_Append(d, v) != 0) {