On Jul 21, 2007, at 8:09 AM, john gilmore wrote:
The question how SMF records can be accessed with any generality is
being fudged.
One can now access some of them some of the time in (modern) COBOL,
which does support the data type FUNCTION POINTER.
COBOL does not, however, support self-defining records, illustrated
by the trivial PL/I construct
declare 1 SDAT based(SDATp), /* self-defining array */
2 sdls signed binary fixed(31,0), /* low element subscript */
2 sdhs signed binary fixed(31,0), /* high element subscript */
2 sdek signed binary fixed(31,0), /* single-element byte count */
2 sdea(0: refer(SDDAT.sdls):1 refer(SDAT.sdhs)) character(1 refer
(SDAT.sdek)) ;
which can be used as a sort of DSECT for any character-string
array. Such self-defining records and subrecords abound in SMF
output. (COBOL types who may suppose that COBOL's occurs-depending
is a functioonal equivalent of PL/I's refer are warned that it is
not.)
SMF records can be accessed and manipulated using HLASM routines,
and this can be done in PL/I too. It cannot, in general, be done
in COBOL or indeed in C/C++.
SMF-accessing routines that are to see repeated, significant, heavy
use should therefore be written in assembly language. Those
written to answer particular questions should be written in PL/I
instead, and if they are to be written in a statement-level
procedural language they must be written in PL/I.
It is, I think, worth noting explicitly that Ed Gould, alone among
contributors to this thread, did identify this problem.
John Gilmore
Ashland, MA 01721-1817
USA
John,
Thanks for the authoritative answer.
Ed
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