Fix issue 2857.

This change fixes issue 2857 by changing Platform.win32._scons_file from a
function to a class.

1 files changed, 6 insertions, 7 deletions

diff --git a/src/engine/SCons/Platform/win32.py b/src/engine/SCons/Platform/win32.py
index 98dfe45b..664969ab 100644
--- a/src/engine/SCons/Platform/win32.py
+++ b/src/engine/SCons/Platform/win32.py
@@ -64,13 +64,12 @@ else:
 
     _builtin_file = builtins.file
     _builtin_open = builtins.open
-    
-    def _scons_file(*args, **kw):
-        fp = _builtin_file(*args, **kw)
-        win32api.SetHandleInformation(msvcrt.get_osfhandle(fp.fileno()),
-                                      win32con.HANDLE_FLAG_INHERIT,
-                                      0)
-        return fp
+
+    class _scons_file(_builtin_file):
+        def __init__(self, *args, **kw):
+            _builtin_file.__init__(self, *args, **kw)
+            win32api.SetHandleInformation(msvcrt.get_osfhandle(self.fileno()),
+                win32con.HANDLE_FLAG_INHERIT, 0)
 
     def _scons_open(*args, **kw):
         fp = _builtin_open(*args, **kw)