Fix Async import problem on Posix

Windows only seems to return WSAE* errors, so we need to check for these
errors on Windows.

However the WSAE* error definitions only exist on Windows, they do not
exist on Posix.

Trying to import them causes a failure on Posix.

On Posix, we now just reassign the WSAE* error values to the normal E*
values, letting the code compile.

Author: rickprice

Lib/asyncore.py

@@ -55,9 +55,24 @@
 import os
 from errno import EALREADY, EINPROGRESS, EWOULDBLOCK, ECONNRESET, EINVAL, \
      ENOTCONN, ESHUTDOWN, EINTR, EISCONN, EBADF, ECONNABORTED, EPIPE, EAGAIN, \
-     errorcode, \
-     WSAEWOULDBLOCK, WSAENOTCONN, WSAEINPROGRESS, WSAEALREADY, WSAEISCONN, \
-     WSAECONNABORTED, WSAENOTCONN, WSAEBADF
+     errorcode
+
+if sys.platform[:3] == 'win':
+    # On Windows, handle the Windows error numbers
+    from errno import \
+        WSAEWOULDBLOCK, WSAENOTCONN, WSAEINPROGRESS, WSAEALREADY, WSAEISCONN, \
+        WSAECONNABORTED, WSAENOTCONN, WSAEBADF
+else:
+    # On Posix the error codes aren't duplicated, with different numbers
+    WSAEWOULDBLOCK = EWOULDBLOCK
+    WSAENOTCONN = ENOTCONN
+    WSAEINPROGRESS = EINPROGRESS
+    WSAEALREADY = EALREADY
+    WSAEISCONN = EISCONN
+    WSAECONNABORTED = ECONNABORTED
+    WSAENOTCONN = ENOTCONN
+    WSAEBADF = EBADF
+
 
 _DISCONNECTED = frozenset((ECONNRESET, ENOTCONN, ESHUTDOWN, ECONNABORTED, EPIPE,
                            EBADF, WSAENOTCONN, WSAECONNABORTED, WSAEBADF))