dosetitimer
return dosetitimer(p, which, &aitv);
error = dosetitimer(l->l_proc, which, &b_itv);
if ((error = dosetitimer(p, ITIMER_REAL, &itv)) != 0) {
return dosetitimer(p, which, &aitv);
return dosetitimer(p, which, &aitv);
return dosetitimer(p, which, &aitv);
int dosetitimer(struct proc *, int, struct itimerval *);