function drupal_cron

Implementation of hook_cron(); handles pings to and from the site.

File

modules/drupal.module, line 140

Lets users log in using a Drupal ID and can notify a central server about your site.

Code

function drupal_cron() {
  if (time() - variable_get('cron_last', 0) > 21600) {

    // If this site acts as a Drupal XML-RPC server, delete the sites that
    // stopped sending "ping" messages.
    if (variable_get('drupal_client_service', 0)) {
      $result = db_query("SELECT cid FROM {client} WHERE changed < %d", time() - 259200);
      while ($client = db_fetch_object($result)) {
        db_query("DELETE FROM {client_system} WHERE cid = %d", $client->cid);
        db_query("DELETE FROM {client} WHERE cid = %d", $client->cid);
      }
    }

    // If this site acts as a Drupal XML-RPC client, send a message to the
    // Drupal XML-RPC server.
    if (variable_get('drupal_register', 0) && variable_get('drupal_server', 0)) {
      drupal_notify(variable_get('drupal_server', ''));
    }
  }
}