The directory and the template are date structures built by the compilers. They contain the information used by the operating system to match entry points in a library with entry points declared in a calling program.
When a program exports entry points and contains a FREEZE statement, the object code file for that program contains a library directory. One directory exists for each block that contains an EXPORT declaration. After a library freezes (executes a FREEZE statement), only one directory is in effect until the library program finishes executing.
A library directory contains a description of all the entry points in the library. This description includes the following information:
-
The name of the entry point
-
The type of the entry point
-
A description of the entry point parameters
-
Information on how the entry point is provided. For more information, see Linkage Provisions.
When a program declares a library and entry points in that library, the object code file for the program contains a library template that describes the library and the declared entry points. One template exists for each library declared in the calling program. A template contains the following information:
-
A description of the attributes of the library
-
A description of all the entry points of the library that are declared by the program. Each description includes the following information:
-
The name of the entry point
-
The type of the entry point
-
A description of the entry point parameters
-
The SETACTUALNAME function can be used to change the name of an entry point in an unlinked library template. For more information, refer to SETACTUALNAME Function.
