Index: Lib/multiprocessing/process.py
===================================================================
--- Lib/multiprocessing/process.py	(revision 73477)
+++ Lib/multiprocessing/process.py	(working copy)
@@ -220,7 +220,11 @@
             self._children = set()
             self._counter = itertools.count(1)
             try:
-                os.close(sys.stdin.fileno())
+                sys.stdin.close()
+                try:
+                    os.close(sys.stdin.fileno())
+                except AttributeError:
+                    sys.stdin = open(os.devnull)
             except (OSError, ValueError):
                 pass
             _current_process = self