4 functions implement hook_file_download()

Note: the procedural functions in this list are found by pattern matching, so the list may include some functions that are not actually implementations of this hook.

config_file_download in core/modules/config/config.module

Implements hook_file_download().

file_file_download in core/modules/file/file.module

Implements hook_file_download().

file_test_file_download in core/modules/file/tests/file_test/file_test.module

Implements hook_file_download().

image_module_test_file_download in core/modules/image/tests/modules/image_module_test/image_module_test.module