function hook_user_flood_control in Drupal 7
Respond to user flood control events.
This hook allows you act when an unsuccessful user login has triggered flood control. This means that either an IP address or a specific user account has been temporarily blocked from logging in.
Parameters
$ip: The IP address that triggered flood control.
$username: The username that has been temporarily blocked.
See also
Related topics
2 functions implement hook_user_flood_control()
Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.
- user_flood_test_user_flood_control in modules/user/ tests/ user_flood_test.module 
- Implements hook_user_flood_control().
- user_user_flood_control in modules/user/ user.module 
- Implements hook_user_flood_control().
1 invocation of hook_user_flood_control()
- user_login_final_validate in modules/user/ user.module 
- The final validation handler on the login form.
File
- modules/user/ user.api.php, line 489 
- Hooks provided by the User module.
Code
function hook_user_flood_control($ip, $username = FALSE) {
  if (!empty($username)) {
    // Do something with the blocked $username and $ip. For example, send an
    // e-mail to the user and/or site administrator.
    // Drupal core uses this hook to log the event:
    watchdog('user', 'Flood control blocked login attempt for %user from %ip.', array(
      '%user' => $username,
      '%ip' => $ip,
    ));
  }
  else {
    // Do something with the blocked $ip. For example, add it to a block-list.
    // Drupal core uses this hook to log the event:
    watchdog('user', 'Flood control blocked login attempt from %ip.', array(
      '%ip' => $ip,
    ));
  }
}