chglwpcnt
(void)chglwpcnt(kauth_cred_getuid(p->p_cred), -1);
int count = chglwpcnt(uid, 1);
(void)chglwpcnt(uid, -1);
(void)chglwpcnt(kauth_cred_getuid(ncred), -nlwps);
(void)chglwpcnt(r, nlwps);
chglwpcnt(kauth_cred_getuid(p->p_cred), -1);
chglwpcnt(kauth_cred_getuid(p->p_cred), 1);
int chglwpcnt(uid_t, int);