HFS Use--Requirements

Before you can use an HFS API to work with a particular file system, these conditions must be met:

• You must have *USE authority to the API. This gives you the authority to call the API from your programs.
  
  
• You must have authority to use the file system. Authority to the file system is controlled by the file system's job startup program, described in Start Job Session Exit Program. If you have authority to use the file system's Start Job exit program, you have authority to the file system as a whole.

  Authority to use files and directories within a file system is controlled by the file system itself.
  
  

• The HFS API you want to use must be available for use with the file system. Some file systems might not support all the HFS APIs described in these topics.

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