MENU_SITE_OFFLINE

ajax_prepare_response in includes/ajax.inc

Converts the return value of a page callback into an Ajax commands array.

drupal_deliver_html_page in includes/common.inc

Packages and sends the result of a page callback to the browser as HTML.

drupal_site_offline in includes/common.inc

Delivers a "site is under maintenance" message to the browser.

hook_menu_site_status_alter in modules/system/system.api.php

Control site status before menu dispatching.

menu_execute_active_handler in includes/menu.inc

Execute the page callback associated with the current path.

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