> The only thing you have to do to interact with the OS is make system calls. You can do that without going through the C library. If by "the OS" you mean "Lin

> The only thing you have to do to interact with the OS is make system calls. You can do that without going through the C library. If by "the OS" you mean "Linux". On Windows, calling syscalls is explicitly unsupported and Microsoft will break you mercilessly by changing syscall IDs between versions. On macOS and iOS, libSystem.dylib is the only supported way to call syscalls; syscalls are SPI and Apple will break you if you try to call them directly. BSDs likewise discourage you from calling syscalls. The "syscalls are stable API" principle that Linux is famous for is a weird Linux-specific thing; other OS's don't do it.