I don't know much about XTIOT, sorry for my ignorance ...
some papers that I read from 2012 talk about XTIOT being related to
DYNALLOC and subsystems.
I would like to know if "normal" (?) allocations done using JCL DD
statements still go into the TIOT,
or if not, how this is controlled. If the XTIOT is different and
separate from the TIOT and cannot be
addressed from the own TCB (as before), how can it be found? Or: are
there more than one XTIOTs?
We still have lot's of places in my customer's system, where we look for
certain DDNAMEs using
the logic below (in ASSEMBLER most of the time, not in C, but that makes
no difference).
The logic, BTW, has no AMODE 24 restriction; it would work well with 31
bit pointers.
But in our system we always have batch jobs (or jobs controlling IMS DC
sessions or other things)
and we look for JCL DD statements ... and most often simple DD DUMMY
statements,
and the DD names found (or not found) are used to control some features
of the programs ...
e.g.: //NOSPIE DD DUMMY
which disables an ESPIE call in a certain ASSEMBLER startup routine.
IMO, this still works ... at least I didn't hear of any problems with
this solution so far.
Cheers,
Bernd
Am 30.08.2024 um 17:45 schrieb Farley, Peter:
Bernd, I don’t think that code handles the XTIOT (above the line), which is
pretty commonly standard these days.
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of
Bernd Oppolzer
Sent: Friday, August 30, 2024 11:32 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: JAVA: Can it handle TIOT read?
Don't know, if this helps, but this is a function that reads the TIOT,
looking for a certain DDNAME, and returning success (pointer to the TIOT
entry)
or fail (NULL).
This is ANSI C. No DSECTs or structure definitions needed.
Cheers,
Bernd
static char *check_ddname (char *ddname)
/************************************************/
/* */
/* Vorgegebener DDName wird gesucht */
/* */
/************************************************/
{
char *adresse_tcb;
char *adresse_tiot;
char *laenge_tiot;
char *ddname_tiot;
adresse_tcb = adressiere_tcb ();
adresse_tiot = *(((char **) adresse_tcb) + 3);
for (laenge_tiot = adresse_tiot + 24;
*laenge_tiot != 0;
laenge_tiot += *laenge_tiot)
{
ddname_tiot = laenge_tiot + 4;
if (memcmp (ddname_tiot, ddname, 8) == 0)
{
return ddname_tiot;
}
}
return NULL;
}
Oh, I forgot the function to retrieve the address of the TCB:
static char *adressiere_tcb (void)
/************************************************/
/* */
/* Über die TIOT (Task-IO-Table) */
/* werden die DDNamen und die */
/* zugeordneten DSNamen gesucht */
/* */
/************************************************/
{
char ***cvt_pointer;
char **tcb_tabelle;
cvt_pointer = *((char ****) 16);
tcb_tabelle = *cvt_pointer;
return *(tcb_tabelle + 1);
}
Comments in German language, sorry for that.
Am 30.08.2024 um 17:13 schrieb Denis:
Have you tried to use peekOSMemory, its a bit strange to do control Block
hopping in Java and using this method, there is No dsect conversion or so, Just
Pointer Arithmetik, but it should be possible to do similar Things as in
Assembler.
https://urldefense.com/v3/__https://github.com/zsystems/java-samples/blob/master/PeekOSMemory.java__;!!Ebr-cpPeAnfNniQ8HSAI-g_K5b7VKg!NEx7ohh6jGjaguKWNtdhaxAKUaFx-22ClbFpOzQ6bUKuJ3bdUqITCqnpPknJ8ySX0mHR1pByDDmZgdn9EvuMtwbilCEF6ExPzws$<https://urldefense.com/v3/__https:/github.com/zsystems/java-samples/blob/master/PeekOSMemory.java__;!!Ebr-cpPeAnfNniQ8HSAI-g_K5b7VKg!NEx7ohh6jGjaguKWNtdhaxAKUaFx-22ClbFpOzQ6bUKuJ3bdUqITCqnpPknJ8ySX0mHR1pByDDmZgdn9EvuMtwbilCEF6ExPzws$>
You could combine it with the jzos record Generator, that allows to create Byte
identical Java records with getter and Setter methods based on cobol copybooks
or Assembler dsects.
But the Code Looks strange to a Java Developer.
Denis.
On Friday, August 30, 2024 at 04:57:29 PM GMT+2, Steve Thompson
<ste...@wkyr.net<mailto:ste...@wkyr.net>> wrote:
I'm working on a project to "modernize" ALC to Java.
And I have code that is reading the TIOT to find DDs that the
process is interested in.
The subject is the question. I'm documenting routines (biz logic)
and the program I'm working on is a bit challenging.
I know Java, kinda, when I see it. But I haven't found any method
for this.
Anyone have to deal with this before (in Java)?
Regards,
Steve Thompson
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