6 uses of FILE_READABLE in Drupal 5

drupal_install_fix_file in includes/install.inc

Attempt to fix file permissions.

drupal_install_mkdir in includes/install.inc

Create a directory with specified permissions.

drupal_verify_install_file in includes/install.inc

Verify the state of the specified file.

install_change_settings in ./install.php

Configure and rewrite settings.php.

install_main in ./install.php

The Drupal installation happens in a series of steps. We begin by verifying that the current environment meets our minimum requirements. We then go on to verify that settings.php is properly configured. From there we connect to the configured database…

system_requirements in modules/system/system.install

Test and report Drupal installation requirements.