Requesting dynamic allocation functions
This information explains how to code a dynamic allocation request.
- Building the SVC 99 parameter list describes what you must code to submit the dynamic allocation request, and what information the system returns to you.
- SVC 99 parameter list verb codes and text units, by function describes how to code text units to supply the parameters for a dynamic allocation request. The text units are listed by function.
To diagnose errors in your dynamic allocation request, see Processing messages and reason codes from dynamic allocation, which describes the return and reason codes, and supplies actions for correcting the error.
To process dynamic allocation messages and reason codes, see Processing messages and reason codes from dynamic allocation, which describes how to set the fields of the request block extension to request message processing, and how to process the messages you receive from dynamic allocation.
If you are unfamiliar with dynamic allocation, or are not sure that dynamic allocation is right for your program or your programming environment, read Dynamic allocation before using this information to code a dynamic allocation request. This information describes allocation, when to use dynamic allocation and when not to, and which dynamic allocation functions are meaningful in a batch or an interactive environment.
BPXWDYN is a text interface to a subset of the SVC 99 (dynamic allocation) and SVC 109 (dynamic output) services. BPXWDYN supports data set allocation, unallocation, concatenation, and the addition and deletion of output descriptors. BPXWDYN is designed to be called from REXX, but it may be called from several other programming languages, including Assembler, C, and PL/I. For more information, see z/OS Using REXX and z/OS UNIX System Services.