unreachable
#ifndef unreachable
int got_there = 0, unreachable = 0, timeout = 0, loss;
++unreachable;
++unreachable;
++unreachable;
++unreachable;
++unreachable;
++unreachable;
++unreachable;
++unreachable;
++unreachable;
++unreachable;
++unreachable;
if (got_there || (unreachable && (unreachable + timeout) >= nprobes))
int unreachable = 0;
++unreachable;
++unreachable;
++unreachable;
++unreachable;
(unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) {