Function nc::fchmodat

pub fn fchmodat(dirfd: i32, filename: &str, mode: mode_t) -> Result<(), Errno>

Change permissions of a file.

let filename = "/tmp/nc-fchmodat";
let ret = nc::creat(filename, 0o644);
assert!(ret.is_ok());
let fd = ret.unwrap();
assert!(nc::close(fd).is_ok());
assert!(nc::fchmodat(nc::AT_FDCWD, filename, 0o600).is_ok());
assert!(nc::unlink(filename).is_ok());