No worries. You can use libc::syscall to make syscalls in the normal way, and that's technically ffi. Otherwise, to do raw syscalls, AFAIK you need to write so

No worries. You can use libc::syscall to make syscalls in the normal way, and that's technically ffi. Otherwise, to do raw syscalls, AFAIK you need to write some Assembly to do it. Running an assembler and linking it into a Rust program is pretty straight-forward. It would be nicer if one could use inline assembly (and let the compiler handle it for you), but that hasn't been stabilized yet. The topic of whether to build a Rust standard library without libc is definitely one that has gotten some attention, and some folks have made some progress on that front, but AFAIK there is no serious ongoing project or effort that attempts this. Some folks definitely desire it though, at least for Linux. (In other platforms, like macOS and Windows, raw syscalls aren't a stable interface, so you kind of need to use the system libraries.)