chgproccnt
(void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
if (!chgproccnt(cred->cr_ruidinfo, 1, lim_cur(td, RLIMIT_NPROC))) {
chgproccnt(cred->cr_ruidinfo, 1, 0);
const int proccnt_changed = chgproccnt(newcred->cr_ruidinfo, 1,
(void)chgproccnt(newcred->cr_ruidinfo, 1, 0);
(void)chgproccnt(oldcred->cr_ruidinfo, -1, 0);
(void)chgproccnt(cr->cr_ruidinfo, -1, 0);
int chgproccnt(struct uidinfo *uip, int diff, rlim_t maxval);