Function nc::copy_file_range

pub fn copy_file_range(
    fd_in: i32, 
    off_in: &mut loff_t, 
    fd_out: i32, 
    off_out: &mut loff_t, 
    len: size_t, 
    flags: u32
) -> Result<ssize_t, Errno>

Copy a range of data from one file to another.