[0.4.2] herror handler?

[glenn@mathcs.emory.edu (Glenn Barry)]

hi scsh hackers and fans,

When host-info is fed a hostname that does not exists, it looks
like this:

> (host-info "blah")

Error: name->host-info: non-zero herrno ~s ~s
       1
       #f
>

That is, it fails and according to page 92 of the 0.4.2 manual, it
will raise an error for one of the following reasons:

          herror/host-not-found
          herror/try-again
          herror/no-recovery
          herror/no-data
          herror/no-address

So the question is:  how can we gracefully handle these errors?  Is
there anything analogous to with-errno-handler available now or
in the near future for herror?

thx for any insight and all the good work on scsh,
glenn