src/infrastructure/daemon/control/PhabricatorDaemonReference.php

   1 <?php
   2
   3 // TODO: See T13321. After the removal of daemon PID files this class
   4 // no longer makes as much sense as it once did.
   5
   6 final class PhabricatorDaemonReference extends Phobject {
   7
   8   public static function isProcessRunning($pid) {
   9     if (!$pid) {
  10       return false;
  11     }
  12
  13     if (function_exists('posix_kill')) {
  14       // This may fail if we can't signal the process because we are running as
  15       // a different user (for example, we are 'apache' and the process is some
  16       // other user's, or we are a normal user and the process is root's), but
  17       // we can check the error code to figure out if the process exists.
  18       $is_running = posix_kill($pid, 0);
  19       if (posix_get_last_error() == 1) {
  20         // "Operation Not Permitted", indicates that the PID exists. If it
  21         // doesn't, we'll get an error 3 ("No such process") instead.
  22         $is_running = true;
  23       }
  24     } else {
  25       // If we don't have the posix extension, just exec.
  26       list($err) = exec_manual('ps %s', $pid);
  27       $is_running = ($err == 0);
  28     }
  29
  30     return $is_running;
  31   }
  32
  33 }