Function login_cap_sys::login_getclass

pub unsafe extern "C" fn login_getclass(
    _class: *mut c_char
) -> *mut login_cap_t

From login_getclass(3):

The login_getclass() function extracts the entry specified by class (or
default if class is NULL or the empty string) from /etc/login.conf (see
login.conf(5)).  If the entry is found, a login_cap_t pointer is
returned.  NULL is returned if the user class is not found.  When the
login_cap_t structure is no longer needed, it should be freed by the
login_close() function.