The attached patch against usocket HEAD (basically usocket-0.5.1) address for following for ABCL:
1. GET-ADDRESS now works with underlying IP6 addresses
2. Fix SOCKET-ACCEPT to follow the documented API so that when called without an :ELEMENT-TYPE argument, use the ELEMENT-TYPE of specified in the corresponding call to SOCKET-LISTEN.
With the [corresponding patches][1] this allows ABCL to run Hunchentoot.
[1]: http://detroit.slack.net/~evenson/abcl/hunchentoot