resolves issue 18 multiprocessing py.test co-existence

add fileno() method and test DontReadFromInput redirection some more

--HG--
branch : 1.0.x

CHANGELOG

@@ -12,6 +12,8 @@ Changes between 1.0.0b3 and 1.0.0
 
 * apply patch from Daniel Peolzleithner (issue #23) 
 
+* resolve issue #18, multiprocessing.Manager() and 
+  redirection clash 
 
 Changes between 1.0.0b1 and 1.0.0b3
 =============================================

py/io/stdcapture.py

@@ -136,9 +136,11 @@ class DontReadFromInput:
     readline = read
     readlines = read
     __iter__ = read
-
+   
+    def fileno(self):
+        raise ValueError("redirected Stdin is pseudofile, has no fileno()") 
     def isatty(self):
-	return False
+        return False
 
 try:
     devnullpath = os.devnull

py/io/testing/test_stdcapture.py

@@ -1,6 +1,15 @@
 import os, sys
 import py
 
+def test_dontreadfrominput():
+    from py.__.io.stdcapture import  DontReadFromInput
+    f = DontReadFromInput()
+    assert not f.isatty() 
+    py.test.raises(IOError, f.read)
+    py.test.raises(IOError, f.readlines)
+    py.test.raises(IOError, iter, f) 
+    py.test.raises(ValueError, f.fileno)
+
 class TestStdCapture: 
     def getcapture(self, **kw):
         return py.io.StdCapture(**kw)