Update PEP with latest changes.

pep-0475.txt

@@ -167,6 +167,7 @@ Modified functions
 Example of standard library functions that need to be modified to comply
 with this PEP:
 
+* ``open()``, ``os.open()``
 * ``os.read()``, ``io.FileIO.read()``, ``io.FileIO.readinto()``
 * ``os.write()``, ``io.FileIO.write()``
 * ``os.waitpid()``
@@ -187,6 +188,12 @@ with this PEP:
 (note: the ``selector`` module already retries on ``InterruptedError``, but it
 doesn't recompute the timeout yet)
 
+``os.close`` and ``close()`` methods are a special case: they will ignore
+EINTR instead of retrying.  The reason is complex but involves behaviour
+under Linux and the fact that `the file descriptor may really be closed
+<http://lwn.net/Articles/576478/>`_ even if EINTR is returned.
+
+
 InterruptedError handling
 -------------------------