Re: Who pulled the trigger? / Call stack

[John P Carr <jpcarr@xxxxxxxxxxxx>]

Here it goes,  This is a low tech solution and can be made into Procedures
using Message API's if you want to make it real fancy.   But as is,  it will

also work for the average Joe/Jane programmer too. 

For trigger's
In your *INZSR subroutine repeatedly call a CLP to retrieve the program
name of the caller.  You can "walk up the Stack" past the programs(OS/400's
that begin with "Q")  to the program you're looking for. 

---
Just call the below program repeatedly(in a loop in your *INZSR),  First
time 
pass your trigger program name(the program who's *inzsr you are
currently in that is)  as the &CALLED, and who ever called your 
trigger will be returned in the &CALLER variable.  This will undoubtedly be
a "Q" 
OS/400 program.  Call the CLP again this time pass what was returned the
first time to find out who called him, and so on.  up the stack till *EXT.

Stop at the first program name(&CALLER) doesn't begin with a "Q". 
That's the application program that kicked off the trigger..

--------------
PGM    &CALLER &CALLED

DCL   &CALLER  *CHAR  10  
DCL   &CALLED  *CHAR  10
DCL   &M1KEY   *CHAR   4
DCL   &M1MDTA  *CHAR  80

SNDPGMMSG  MSG('TEST')  TOPGMQ(*PRV &CALLED) MSGTYPE(*RQS) KEYVAR(&M1KEY)

RCVMSG   PGMQ(*PRV &CALLED)  MSGKEY(&M1KEY)  SENDER(&M1MDTA)

CHGVAR   &CALLER    %SST(&M1MDTA  56 10)

ENDPGM
----------------------------

So,   Just call it with a program name(&CALLED) and it will tell you who
called
that program(&CALLER) ,  next time pass it what was returned the previous
time 
to find out who called him, and so on up the stack.   Look at the name
returned
(&CALLER)  if the first position of the name is a "Q"  it's an OS/400
program.
(Unless you are ,  hmm shall we we say,  Dumb enough to start your program 
names with the letter Q ?)


John Carr
EdgeTech

Visit  www.400school.com  for classroom education information.






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