The userspace networking portion of the talk starts at 46:00. To clarify, the whole networking stack isn't userspace. They still have the classical BSD network

The userspace networking portion of the talk starts at 46:00. To clarify, the whole networking stack isn't userspace. They still have the classical BSD networking stack. I think the userspace networking stack is used automatically by system libraries like URLSessions and this new Network.framework library. They introduced their userspace networking stack during last year's WWDC: https://developer.apple.com/videos/play/wwdc2017/707 https://developer.apple.com/videos/play/wwdc2017/707