Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.

backdrop_exit in core/includes/common.inc
Performs end-of-request tasks.
drupal_exit in core/includes/drupal.inc
Performs end-of-request tasks.
redirect_exit in core/modules/redirect/redirect.module
Implements hook_exit().
system_test_exit in core/modules/simpletest/tests/system_test.module
Implements hook_exit().
system_test_lock_exit in core/modules/simpletest/tests/system_test.module
Try to acquire a specific lock, and then exit.
theme_test_exit in core/modules/simpletest/tests/theme_test.module
Implements hook_exit().
token_test_exit in core/modules/simpletest/tests/token_test.module
Implements hook_exit().