Function rustix::fs::copy_file_range
pub fn copy_file_range<InFd: AsFd, OutFd: AsFd>(fd_in: &InFd, off_in: Option<&mut u64>, fd_out: &OutFd, off_out: Option<&mut u64>, len: u64) -> io::Result<u64>pub fn copy_file_range<InFd: AsFd, OutFd: AsFd>(fd_in: &InFd, off_in: Option<&mut u64>, fd_out: &OutFd, off_out: Option<&mut u64>, len: u64) -> io::Result<u64>