i looked at the glibc sysdeps/unix/sysv/linux
and linux userspace kernel header changes and
added some missing stuff

ppl with more understanding might want to review

the changes are in my review branch
repo: git://nsz.repo.hu:45100/repo/musl
browse: http://nsz.repo.hu/git/?p=musl;a=shortlog;h=refs/heads/review

attached a diff