This is a completely standalone sleep implementation for x86_64 Linux that depends only on the Linux kernel.

I made it for my YouTube video which you can find here:

https://www.youtube.com/watch?v=IbibjkI1kIs

Sources:

GCC inline assembly howto

System V Application Binary Interface

GCC Manual

License: either MIT or Public Domain, whichever you prefer.

Build:

rustc -o sleep_rs ./sleep.rs --edition=2024 -Copt-level=3 -Clink-arg=-nostartfiles  -Cpanic=abort -Cstrip=debuginfo

gcc -o sleep_c -O3 -nolibc -fno-stack-protector -nostartfiles sleep.c