This is a very philosophical point of view, but:
the traditional EXEC PGM= parameter linkage can in fact be seen
as a special case of the traditional CALL/ATTACH/XCTL interface,
where the reg1 address list contains the address of only 1 parameter,
which is a character varying. Two more things, which are special about this
case of parameter transfer: the CHAR VAR is limited to 100 bytes (in the
traditional PARM= situation), and it is read-only.
I was always very impressed about this design, because the normal
linkage convention is kind of extended to cover this special case, too.
Of course, if the called program is PL/1, things get complicated again,
because PL/1 needs descriptors (called dope vectors in earlier releases),
so the PL/1 runtime has to cope with this. But for ASSEMBLER and other
languages, the PARM= interface works perfectly.
Kind regards
Bernd
Am 31.03.2013 16:54, schrieb Peter Relson:
You seem to be contradicting yourself here. Or is there a (new?)
way for the initiator to run programs other than "the traditional
CALL/EXEC/ATTACH/XCTL interface", but transparent to the program
which is run?
I thought that by mentioning CALL, ATTACH, and XCTL"interface" you were
referring to the interface to the target routine, where the "traditional"
parameter list format is register 1 pointing to a parameter list each
entry of which contained the address of a parameter
(or perhaps "argument" is the proper term here).
The "interface" to an EXEC PGM= target is not that "traditional" form, of
course.
The batch initiator does of course still use ATTACH for the jobstep
program.
Peter Relson
z/OS Core Technology Design
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