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diff --git a/python/gevent/win32util.py b/python/gevent/win32util.py
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+# Copyright (c) 2001-2007 Twisted Matrix Laboratories.
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and associated documentation files (the
+# "Software"), to deal in the Software without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Software, and to
+# permit persons to whom the Software is furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+"""Error formatting function for Windows.
+
+The code is taken from twisted.python.win32 module.
+"""
+
+from __future__ import absolute_import
+import os
+
+
+__all__ = ['formatError']
+
+
+class _ErrorFormatter(object):
+    """
+    Formatter for Windows error messages.
+
+    @ivar winError: A callable which takes one integer error number argument
+        and returns an L{exceptions.WindowsError} instance for that error (like
+        L{ctypes.WinError}).
+
+    @ivar formatMessage: A callable which takes one integer error number
+        argument and returns a C{str} giving the message for that error (like
+        L{win32api.FormatMessage}).
+
+    @ivar errorTab: A mapping from integer error numbers to C{str} messages
+        which correspond to those errors (like L{socket.errorTab}).
+    """
+    def __init__(self, WinError, FormatMessage, errorTab):
+        self.winError = WinError
+        self.formatMessage = FormatMessage
+        self.errorTab = errorTab
+
+    @classmethod
+    def fromEnvironment(cls):
+        """
+        Get as many of the platform-specific error translation objects as
+        possible and return an instance of C{cls} created with them.
+        """
+        try:
+            from ctypes import WinError
+        except ImportError:
+            WinError = None
+        try:
+            from win32api import FormatMessage
+        except ImportError:
+            FormatMessage = None
+        try:
+            from socket import errorTab
+        except ImportError:
+            errorTab = None
+        return cls(WinError, FormatMessage, errorTab)
+
+    def formatError(self, errorcode):
+        """
+        Returns the string associated with a Windows error message, such as the
+        ones found in socket.error.
+
+        Attempts direct lookup against the win32 API via ctypes and then
+        pywin32 if available), then in the error table in the socket module,
+        then finally defaulting to C{os.strerror}.
+
+        @param errorcode: the Windows error code
+        @type errorcode: C{int}
+
+        @return: The error message string
+        @rtype: C{str}
+        """
+        if self.winError is not None:
+            return str(self.winError(errorcode))
+        if self.formatMessage is not None:
+            return self.formatMessage(errorcode)
+        if self.errorTab is not None:
+            result = self.errorTab.get(errorcode)
+            if result is not None:
+                return result
+        return os.strerror(errorcode)
+
+formatError = _ErrorFormatter.fromEnvironment().formatError