Function nc::getresgid

pub fn getresgid(
    rgid: &mut gid_t, 
    egid: &mut gid_t, 
    sgid: &mut gid_t
) -> Result<(), Errno>

Get real, effect and saved group ID.

let mut rgid = 0;
let mut egid = 0;
let mut sgid = 0;
let ret = nc::getresgid(&mut rgid, &mut egid, &mut sgid);
assert!(ret.is_ok());
assert!(rgid > 0);
assert!(egid > 0);
assert!(sgid > 0);