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Name Type Location Description
MAINTENANCE_MODE constant core/authorize.php Global flag to identify update.php and authorize.php runs.
MAINTENANCE_MODE constant core/install.php Global flag to indicate the site is in installation mode.
MAINTENANCE_MODE constant core/update.php Global flag indicating that update.php is being run.
system_site_maintenance_mode function core/modules/system/system.admin.inc Form builder; Configure the site's maintenance status.
system_site_maintenance_mode_submit function core/modules/system/system.admin.inc Submit handler for the system_site_maintenance_mode() form.
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