RE: Open Source discussion on error handling was: RPGIII/RPG400 ERRORMONITORING

[Buck Calabro <buck.calabro@xxxxxxxxxxxxxxxxx>]

Leslie wrote:

>You can monitor STSCODE for a value other than 00000 !
>00102 is a divide by zero error, just monitor for it and call 
>your error handler.

If you do not have a *PSSR defined a divide by zero will issue a white
message.  You cannot "trap/monitor" in RPGIII unless you have a *PSSR.  

>With *PSSR there is not really much choice, either let 
>RPG default handler take over or code it to return to 
>some point in the fixed logic cycle.

That's what this thread should be about.  What is the best way to leave the
*PSSR and "continue"?  I posted a clumsy solution that involved each routine
identifying itself.  If an error occurs in that routine, control passes to
the global *PSSR, which returns control to the top of the code.  At the top
is a series of GOTO statements that direct operation to "the next line"
based on the identification of the failing routine.

>No matter what you do to trap the error (there are as 
>many ways, as errors) each error could require radically 
>different methods to correct.

This should be part of the discussion as well.  "What sort of errors can be
encountered?"  Some errors can be avoided altogether by programming
standards: Check every DIV to be sure you don't divide by zero.  Check every
array reference to be sure you're within bounds, put an I/O error indicator
on every I/O statement, UC all your files to be able to trap errors at OPEN,
put error indicators on all CALL statements.  But certain classes of errors
cannot be trapped _where they occur_  You have to use the *PSSR to trap
them.  Perhaps the main example of this is the decimal data error.

So.
The question of the moment is: Does the work required to use the *PSSR
outweigh it's usefulness?  Or is there a better way to "continue after
error" in RPG III?

Buck

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