The only other equivalent API in broad use today that I'm aware of would be the Kernel32.dll subset of Win32 [1]. Not that it's perfect (so much accumulated cru

The only other equivalent API in broad use today that I'm aware of would be the Kernel32.dll subset of Win32 [1]. Not that it's perfect (so much accumulated cruft) or what I would call modern (still has a lot of ambient authority baked-in) by any means, but the important parts are mostly handle-based (unlike PID-based POSIX process management functions for example). I happen to like the design of the syscall layer of Fuchsia's Zircon kernel [2], but it's not a full substitute for POSIX (notably, file and network I/O are built as userspace features of top of IPC channels, they are not kernel concepts). [1] https://www.geoffchappell.com/studies/windows/win32/kernel32/api/index.htm https://www.geoffchappell.com/studies/windows/win32/kernel32... [2] https://fuchsia.dev/fuchsia-src/reference/syscalls https://fuchsia.dev/fuchsia-src/reference/syscalls