Mainframe, MVS and zOS Discussion

Posted: **Tue May 27, 2014 12:02 am**

Hi all,

How do we develop the art of reading the control blocks

/*REXX*/
ascb = storage(224,4)                                                     /* psaaold */ 
asxb = storage(d2x(c2d(ascb)+108),4)                                      /* ascbasxb */ 
acee = storage(d2x(c2d(asxb)+200),4)                                      /* acee */ 
unam = storage(d2x(c2d(acee)+100),4)                                      /* aceeunam */ 
user_name=strip(storage(d2x(c2d(unam)+1),24))       
say user_name 
exit

I was able to understand the above code in parts like what each and every line of code does seperately

But what I do not understand is

How is PSAOLD related to ASCBASXB which is related to ACEE and ACEEUNAM

How does one know or develop this knowledge or does it come by experience or does it have a quickref

like if you want to get a user name you need to get this , this and this

Pointers and suggesions will be very much helpful

Posted: **Tue May 27, 2014 3:21 am**

the mother of all the control blocks info is/are

z/OS V1R13: MVS Data Areas Volume 1
http://publibz.boulder.ibm.com/cgi-bin/ ... 0913093243

z/OS V1R13: MVS Data Areas Volume 2
http://publibz.boulder.ibm.com/cgi-bin/ ... 0913093241

z/OS V1R13: MVS Data Areas Volume 3
http://publibz.boulder.ibm.com/cgi-bin/ ... 0913093421

z/OS V1R13: MVS Data Areas Volume 4
http://publibz.boulder.ibm.com/cgi-bin/ ... 0913093446

z/OS V1R13: MVS Data Areas Volume 5
http://publibz.boulder.ibm.com/cgi-bin/ ... 0913093504

z/OS V1R13: MVS Data Areas Volume 6
http://publibz.boulder.ibm.com/cgi-bin/ ... 0913093559

here is the link to some zOS manuals
http://publibz.boulder.ibm.com/cgi-bin/ ... s/all13be9

Posted: **Tue May 27, 2014 11:40 am**

Hi Enrico,

Thanks for the links It helps but I know lot of reading needs to be done

Posted: **Tue May 27, 2014 11:45 am**

.... I know lot of reading needs to be done

that' s what people with experience have done for ages

Posted: **Tue May 27, 2014 12:09 pm**

I know

"Rome was not built on a day"

Posted: **Tue May 27, 2014 7:31 pm**

Along with the great collection from Enrico, You might want to read through this as a starter:

You can download it from here:

[center]

31 zNibbler (zOS Control Blocks).pdf

[/center]

Posted: **Tue May 27, 2014 9:40 pm**

Thanks Anuj .. I will start with this

Posted: **Tue May 27, 2014 10:15 pm**

I'm interested in knowing why you want to nose through control blocks. "Idle curiosity" is a good answer, of course. :-)

Posted: **Tue May 27, 2014 10:37 pm**

Because they are there

the same reply

Because they are there

was given by George Mallory when He was asked ...

Why you climb mountains ?

Posted: **Tue May 27, 2014 11:45 pm**

Hi Martin,

I always have a fad of knowing things happening at back ground and since I don't get the oppurtunity to creating a product or in system programming .. All I could do is "reasearch and develop"

Also welcome to forum your expertise is a bliss for many of us

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