pub fn fclonefileat<Fd: AsFd, DstFd: AsFd, P: Arg>( src: &Fd, dst_dir: &DstFd, dst: P, flags: CloneFlags) -> Result<()>
fclonefileat(src, dst_dir, dst, flags)—Efficiently copies between files.
fclonefileat(src, dst_dir, dst, flags)