[ben_bai]

Then don't run a OS with a kernel written in C. That would rule out Windows, Mac, Linux and *BSD.

[eikenberry]

Using syscalls means you can replace the kernel. Using libc means you are locked into and FFI/C calling convention for anything other than C. Apples/Oranges.

[saagarjha]

There’s nothing wrong with the C calling convention, at least from a security perspective.