Function sendfile

crates/vm/src/stdlib/posix.rs:2645–2656

(args: SendFileArgs<'_>, vm: &VirtualMachine)

    #[cfg(target_os = "linux")]
    #[pyfunction]
    fn sendfile(args: SendFileArgs<'_>, vm: &VirtualMachine) -> PyResult {
        let mut file_offset = args.offset;

        let res = nix::sys::sendfile::sendfile(
            args.out_fd,
            args.in_fd,
            Some(&mut file_offset),
            args.count as usize,
        )
        .map_err(|err| err.into_pyexception(vm))?;
        Ok(vm.ctx.new_int(res as u64).into())
    }

    #[cfg(target_os = "macos")]
    fn _extract_vec_bytes(