This part of the system interface allows to access information from directories, e.g., directory listings and file information like modification time. All filenames are stored in structures instead of system dependent strings to allow easier modification and access. For inquiring a file listing of a directory file regular expression can be specified as shown in Table A.2.
Tabelle A.2: File pattern expression for directory listing
Information about the user, either the one executing the program or any other can be inquired. This is required to check allowed file accesses (group and world access).