This is a small OS portability library to retrieve and set file attributes not supported by the Lisp standard functions.
Simply use the functions access-time, modification-time, and creation-time to access the relevant timestamps. Some stamps may not be accessible or modifiable depending on your OS or file system.
In order to manage attribute information, use owner, group, and attributes. The values used are OS specific for these functions, though the attributes flag can be decoded and encoded via a standardised form with decode-attributes and encode-attributes.
Any of the above operations may signal an error if the file does not exist, is inaccessible, the operation is not possible, or some other failure occurred.