Function posish::fs::fclonefileat

pub fn fclonefileat<Fd: AsRawFd, DstFd: AsRawFd, P: Arg>(
    src: &Fd, 
    dst_dir: &DstFd, 
    dst: P, 
    flags: CloneFlags
) -> Result<()>

fclonefileat(src, dst_dir, dst, flags)