Hi,
Wang Rong posted the following:
" Are there any way to perform file I/O in Assembler program without
define a DD card in the calling JCL. For some reason, I want to give the
file name in Assembler source, not in the calling JCL. Can OPEN macro do
that?
By the way, I can't find the description of some macro such as OPEN,
GET, DCB in the IBM read books, Can some tell me where to find them?"
A DD Statement is converted to internal format as a JCFB + JFCBX as necessary I
believe, and a JFCB is necessary as part of the allocation process. If a DD
statement isn't available, then the use of Dynamic Allocation is called for to
create the necessary structures to allow file allocation. A search of the
archive of this site should produce numerous hits on Dynamic Allocation.
The OPEN, DCB macros etc are in the DFSMS Macro Instructions for Data Sets
manual, not a Red Book, and the manual can be found at:
http://publibz.boulder.ibm.com/epubs/pdf/dgt2d511.pdf
Kind regards - Terry
Terry Sambrooks
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KMS-IT Limited
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