diff --git a/Lib/tempfile.py b/Lib/tempfile.py
index 472fd83..1405a7f 100644
--- a/Lib/tempfile.py
+++ b/Lib/tempfile.py
@@ -47,8 +47,9 @@
         pass
 else:
     def _set_cloexec(fd):
-        flags = _fcntl.fcntl(fd, _fcntl.F_GETFD, 0)
-        if flags >= 0:
+        try: flags = _fcntl.fcntl(fd, _fcntl.F_GETFD, 0)
+        except IOError: pass
+        else:
             # flags read successfully, modify
             flags |= _fcntl.FD_CLOEXEC
             _fcntl.fcntl(fd, _fcntl.F_SETFD, flags)