title: What is the correct printf specifier for printing pid_t
body: <p>I'm currently using a explicit cast to long and using <code>%ld</code> for printing <code>pid_t</code>, is there a specifier such as <code>%z</code> for <code>size_t</code> for <code>pid_t</code>?</p>
  
  <p>If not what the best way of printing <code>pid_t</code>?</p>