proc_realparent
t = proc_realparent(q);
t = proc_realparent(p);
for (; p != curproc; p = proc_realparent(p)) {
pp = proc_realparent(p);
if (proc_realparent(p2) == reap)
if (proc_realparent(p2) == reap)
pp = proc_realparent(p);
struct proc *proc_realparent(struct proc *child);