Comment by __d
12 hours ago
XNU has some interesting features.
It’s Mach based, so it has Mach ports, which are an IPC system that is fairly heavily used by macOS.
It has DriverKit, which is a C++ framework for drivers that’s got morecsuppirt than the usual Unix driver model.
Mach-O does more than ELF, and enables the two-layer namespacing that makes macOS able to manage dynamic linking dependencies better than ELF.
Nothing really earth-shattering but interesting enough. And far easier to build a macOS environment on than FreeBSD.
> Mach-O does more than ELF, and enables the two-layer namespacing that makes macOS able to manage dynamic linking dependencies better than ELF.
I've always admired that mach-o supports fat binaries.