add close method to DontReadFromInput so multiprocessing can close it

--HG--
branch : trunk

py/_io/capture.py

@@ -334,6 +334,8 @@ class DontReadFromInput:
         raise ValueError("redirected Stdin is pseudofile, has no fileno()") 
     def isatty(self):
         return False
+    def close(self):
+        pass
 
 try:
     devnullpath = os.devnull

testing/io_/test_capture.py

@@ -66,6 +66,7 @@ def test_dontreadfrominput():
     py.test.raises(IOError, f.readlines)
     py.test.raises(IOError, iter, f) 
     py.test.raises(ValueError, f.fileno)
+    f.close() # just for completeness
 
 def pytest_funcarg__tmpfile(request):
     testdir = request.getfuncargvalue("testdir")