Issue1119

Twisted wants to get the pending socket error to notify the application
when certain errors occur, but it can't:

          File
"/home/glyph/Projects/Twisted/trunk/twisted/internet/tcp.py", line 629,
in doConnect
            err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
        exceptions.AttributeError: 'module' object has no attribute
'SO_ERROR'

There are two parts to this bug.

1. The jython socket module is indeed missing the SO_ERROR option constant.
2. Java does not support the SO_ERROR option anyway.

Currrently, the jython socket module supports *all* of the limited set
of socket options available on the java platform; documented here, under
"Socket Options"; SO_ERROR is explicitly not supported.

http://wiki.python.org/jython/NewSocketModule

The current behaviour when a non-supported option is requested through
either setsockopt or getsockopt is to raise an exception.

So the resolution on this bug will be 

1. The SO_ERROR constant will be added to the jython socket module
2. But any attempt to use it in [g|s]etsockopt will result in an
exception, like so

try:
  err = self.socket.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
except socket.error, se:
  if se[0] == errno.ENOPROTOOPT:
    print "Socket does not support the SO_ERROR option"

I will check in this fix later today.

Fix checked into trunk and release 2.2 branch.

The socket module now has an SO_ERROR constant, so AttributeError should
no longer occur.

However, the constant has no usage on the JVM, because SO_ERROR is not
supported.

Attempts to use the constant as a parameter to getsockopt will result in
a socket.error exception, with errno == errno.ENOPROTOOPT, as occurs
with all other unsupported socket options on jython.

Thanks for submitting this bug.

Support for SO_ERROR checked in here

http://hg.python.org/jython/rev/a39725e023f2

And tidied up here

http://hg.python.org/jython/rev/6579bd02d930