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Using dynamic allocation
You can use the language features, functions, and syntax as documented in the IBM compiler manual to accomplish dynamic allocation. Some languages have limitations for the types of allocation options you can use. In complex cases, it may be necessary to write an Assembler language subroutine to be called by your program in order to accomplish the allocation request. The following is a summary of the language feature that you can use to issue dynamic allocation requests in the compiled language. See the appropriate compiler documentation for language syntax specifics and rules for use.
Cobol: Specify an environment variable with the DSN option, and specify the name of the environment variable in the ASSIGN statement.
PL/I: Use the OPEN FILE TITLE(‘dsn’) syntax for dynamic allocation.
C: Use the dynalloc() function.
Assembler: Full control over dynamic allocation is available to assembler programs. Build your text units as documented in IBM z/OS Authorized Assembler Services and issue the DYNALLOC macro or SVC 99. Despite the fact that dynamic allocation is documented in an authorized programming manual, dynamic allocation can be issued freely in a non-authorized environment.
