7 uses of FILE_READABLE in Drupal 7

drupal_install_fix_file in includes/install.inc

Attempts to fix file permissions.

drupal_install_mkdir in includes/install.inc

Creates a directory with the specified permissions.

drupal_verify_install_file in includes/install.inc

Verifies the state of the specified file.

install_check_requirements in includes/install.core.inc

Checks installation requirements and reports any errors.

install_configure_form in includes/install.core.inc

Form constructor for a form to configure the new site.

system_requirements in modules/system/system.install

Implements hook_requirements().

update_prepare_d7_bootstrap in includes/update.inc

Performs extra steps required to bootstrap when using a Drupal 6 database.