parent_pids
for (p = pids; parent_pids(p); p = parent_pids(p))
for (p = pids; parent_pids(p); p = parent_pids(p)) {
for (p = pids; parent_pids(p); p = parent_pids(p)) {
for (q = pids; q != p; q = parent_pids(q))
for (p = pids_over_limit; parent_pids(p); p = parent_pids(p)) {