Summary of changes:

1) IPython/core/compilerop.py: IronPython __future__ flags are non-standard,
Solution try/except; comment added

2) IPython/core/completer.py: __main__ was undefined, due to local mistake in
creating IronPython scope; removed this tweak

3) IPython/core/prompts.py: os.getuid() is not defined (IronPython bug; see:
https://mail.python.org/pipermail/ironpython-users/2014-February/016812.html)

4) IPython/lib/inputhook.py: ctypes SystemError; comment added

5) IPython/utils/process.py and IPython/utils/_process_cli.py: adds a
new _process_cli.py which would handle the processes under cli;
fixed os.pathsep

6) IPython/utils/io.py: devnull opened in append mode; changed to "w"

7) New issue: IPython/external/decorator/_decorator.py: IronPython doesn't
have _getframes, unless FullFrames is set to true; comment added

IPython/core/compilerop.py

@@ -43,12 +43,12 b' import time'
 
 # Roughtly equal to PyCF_MASK | PyCF_MASK_OBSOLETE as defined in pythonrun.h,
 # this is used as a bitmask to extract future-related code flags.
-PyCF_MASK = functools.reduce(operator.or_,
-                             (getattr(__future__, fname).compiler_flag
-                              for fname in __future__.all_feature_names
-                              if (hasattr(__future__, fname) and
-                                  hasattr(getattr(__future__, fname), "compiler_flag"))),
-                              0)
+try:
+    PyCF_MASK = functools.reduce(operator.or_,
+                                 (getattr(__future__, fname).compiler_flag
+                                  for fname in __future__.all_feature_names))
+except AttributeError: # IronPython __future__'s are non-standard, 2/8/2014
+    PyCF_MASK = 0
 
 #-----------------------------------------------------------------------------
 # Local utilities

IPython/core/completer.py

@@ -66,10 +66,7 b' Notes:'
 # Imports
 #-----------------------------------------------------------------------------
 
-try:
-    import __main__
-except ImportError:
-    pass
+import __main__
 import glob
 import inspect
 import itertools

IPython/core/prompts.py

@@ -148,6 +148,8 b' USER = py3compat.str_to_unicode(os.environ.get("USER",\'\'))'
 HOSTNAME       = py3compat.str_to_unicode(socket.gethostname())
 HOSTNAME_SHORT = HOSTNAME.split(".")[0]
 
+# IronPython doesn't currently have os.getuid() even if 
+# os.name == 'posix'; 2/8/2014
 ROOT_SYMBOL    = "#" if (os.name=='nt' or sys.platform=='cli' or os.getuid()==0) else "$"
 
 prompt_abbreviations = {

IPython/external/decorator/_decorator.py

@@ -139,7 +139,10 b' class FunctionMaker(object):'
         func.__defaults__ = getattr(self, 'defaults', ())
         func.__kwdefaults__ = getattr(self, 'kwonlydefaults', None)
         func.__annotations__ = getattr(self, 'annotations', None)
-        callermodule = sys._getframe(3).f_globals.get('__name__', '?')
+        try:
+            callermodule = sys._getframe(3).f_globals.get('__name__', '?')
+        except AttributeError: # IronPython _getframe only exists with FullFrames
+            callermodule = '?'
         func.__module__ = getattr(self, 'module', callermodule)
         func.__dict__.update(kw)
 

IPython/lib/inputhook.py

@@ -18,7 +18,7 b' try:'
     import ctypes
 except ImportError:
     ctypes = None
-except SystemError:
+except SystemError: # IronPython issue, 2/8/2014
     ctypes = None
 import os
 import sys

IPython/utils/_process_cli.py

@@ -21,8 +21,7 b' from ._process_common import arg_split'
 
 def _find_cmd(cmd):
     """Find the full path to a command using which."""
-    os_path_sep = ":" if os.name == "posix" else ";"
-    paths = System.Environment.GetEnvironmentVariable("PATH").Split(os_path_sep)
+    paths = System.Environment.GetEnvironmentVariable("PATH").Split(os.pathsep)
     for path in paths:
         filename = os.path.join(path, cmd)
         if System.IO.File.Exists(filename):