Any way to return an error on the create_conn hook?

[Bill Stoddard]

I have a module that implements a create_conn hook that can detect error conditions
requiring the HTTP request to be failed.  If I return NULL from the create_conn hook 
in my
failure case, the default core hook gets run which is NOT what I want to happen. I'd 
like
to be able to return something like -1 to tell the hook code that the request failed 
and
to not attempt to run other create_conn hooks.

Thoughts?

Bill