I have uploaded my slides from BSDcan2005 http://phk.freebsd.dk/pubs/bsdcan2005_ioctl.pdf -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk at FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.