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Cobol Call by Reference and Linkage Section

 
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Mainak_Dalal

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Joined: 05 May 2010
Posts: 19
Location: USA

PostPosted: Fri May 07, 2010 10:09 am    Post subject: Cobol Call by Reference and Linkage Section
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In our System, we have a module call chain as Program A calls Program B and Program B calls Program C.

Program A calls program B (call be reference, the default call) with a copybook of length X(600). But program B has Linkage section variable length as X(1).
Program B does not use this variable, it just passes it to Program C while calling by refernce. In program C, the linkage section is X(600) and this program actually processes the variables of the copybook.

So, Call by refernce does not need calling arguments and Called module Linkage section variables to be of same size until the called module processes the variable? Only if the number of arguments match between calling and called program, then the variable address can be passed?

Can someone please explain how this address translation is happening in this example?
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Fri May 07, 2010 10:26 am    Post subject:
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Hello and welcome to the forum,

Keep in mind that the data from the copybook is not actually passed to the called module. Only the address of the data is passed.

Suggest you read here:
http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/handheld/Connected/BOOKS/igy3lr50/6.2.4.2

At the top of the page is a link to "IBM Manuals" - something you want to become familiar and comfortable with. . .
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