The Legac-e Information Site

Using a Function

Having successfully separated the tasks of creating the LE enclave from the ability to exploit it, it was time to convert the creation task into an External Function.

The function accepts the LE compliant program name as a parameter, creates the LE enclave, and appends the control information to the program name, placing it all in an 18 byte REXX variable (LE_CNTL). (The variable name is arbitrary, so any valid REXX variable name could be used without the need to change the Assembler code).

These are the components used to demonstrate using an External Function

• The REXX routine used as the driver.
  
  The routine was amended to create the LE enclave via a function, which has the LE compliant program name as in input argument.
  
  
• The Assembler Function to create the LE enclave
  
  
• The Assembler Program to invoke the LE compliant program
  
  
• The COBOL program invoked by the Assembler interface
  
  This was unchanged from Phase 4.
  
  
• The Job Control Language (JCL) used for the test.
  
  Batch jobs were used for all test runs to aid debugging as and when necessary.
  
  
• The Job Control Language (JCL) to load the KSDS Cluster.
  
  
• Data loaded into the KSDS Cluster.