[sardon]

The Darwin kernel in OSX has more than userland code taken from FreeBSD. "The kernel of Darwin is XNU, a hybrid kernel which uses OSFMK (Open Software Foundation Mach Kernel) from the OSF, various elements of FreeBSD (including the process model, network stack, and virtual file system)" [0]

[0] https://en.wikipedia.org/wiki/Darwin_%28operating_system%29

[pjmlp]

That was more true in the past.

https://www.amazon.com/Mac-OS-Internals-Approach-paperback/d...

https://www.amazon.com/Mac-OS-iOS-Internals-Apples/dp/111805...

[microtonal]

Could you explain this in more detail? It seems that the network stack, VFS, etc. from BSD are still heavily used?

https://github.com/apple/darwin-xnu/tree/master/bsd

Also, more recently they imported pf from OpenBSD:

https://github.com/apple/darwin-xnu/blob/master/bsd/net/pf.c

Or do you mean that they have recently taken more code from other BSDs than FreeBSD?