Robert,The requested functionality is now available in NetBSD HEAD from <rump/rumperrno2host.h> (not yet in repo.rumpkernel.org/src-netbsd). Please check if the functionality matches your desires.
For a reminder of how to build against HEAD, see: http://wiki.rumpkernel.org/Repo:-buildrump.sh#tips-for-advanced-users (just use anoncvs@anoncvs for BUILDRUMP_CVSROOT instead of dev@cvs) - antti
