nc 0.9.7

Access system calls directly
Documentation 
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/// Set list of supplementary group Ids.
///
/// # Examples
///
/// ```
/// let list = [0, 1, 2];
/// let ret = unsafe { nc::setgroups(&list) };
/// assert!(ret.is_err());
/// assert_eq!(ret, Err(nc::EPERM));
/// ```
pub unsafe fn setgroups(group_list: &[gid_t]) -> Result<(), Errno> {
    let group_len = group_list.len();
    let group_ptr = group_list.as_ptr() as usize;
    syscall2(SYS_SETGROUPS, group_len, group_ptr).map(drop)
}