fd(4) on FreeBSD

The text efa1cd6137ce, as FreeBSD 2.2.8-RELEASE, FreeBSD 2.2.7-RELEASE, FreeBSD 2.2.6-RELEASE, FreeBSD 2.2.5-RELEASE, FreeBSD 2.2.2-RELEASE shipped it.

file descriptor files

fd(4) on FreeBSD now