Function nc::umask

pub fn umask(mode: mode_t) -> Result<mode_t, Errno>

Set file mode creation mask.

let new_mask = 0o077;
let ret = nc::umask(new_mask);
assert!(ret.is_ok());
let old_mask = ret.unwrap();
let ret = nc::umask(old_mask);
assert_eq!(ret, Ok(new_mask));