title: Zombie processes
body: <p>I'v some questions about zombie processes  </p>
  
  <ul>
  <li>what the benefits from zombie process concept?</li>
  <li>know that the kernel keeps (PID,termination status, resource usage information) for zombie process<br>
  what's the meaning of "resource usage information"</li>
  <li>how zombie's PPID() = 1 and it still zombie , (init reaps Zombies because it wait() by default)<br>
  can any one write <em>some C code</em> to make a zombie it's parent is Init?</li>
  <li>can zombies refusing to release some lock on memory??  </li>
  </ul>
  
  <p>thanks in advance</p>