Re: EXTPGM keyword

The EXTPGM is just a flag to the compiler that this is a prototype for a
dynamic call. From the manual

The EXTPGM keyword indicates the external name of the program whose
prototype is being defined.
The name can be a character constant or a character variable.
When EXTPGM is specified, then a dynamic call will be done.
*If neither EXTPGM or EXTPROC is specified, then the compiler assumes that
you are defining a prototype for a procedure*, and assigns it the external
name found in positions 7-21.
Any parameters defined by a prototype with EXTPGM must be passed by
reference. In addition, you cannot define a return value.

On Fri, May 22, 2009 at 8:45 AM, <Tommy.Holden@xxxxxxxxxxxxxxxxxxxxx> wrote:

using EXTPGM will always be a "dynamic" binding, same as using a CALL
opcode. so the compiler doesn't check for the external object.

Thanks,
Tommy Holden



From:
Bryce Martin <BMartin@xxxxxxxxxxxx>
To:
RPG programming on the IBM i / System i <rpg400-l@xxxxxxxxxxxx>
Date:
05/22/2009 09:43 AM
Subject:
Re: EXTPGM keyword
Sent by:
rpg400-l-bounces@xxxxxxxxxxxx



To verify what Alan just said. I had a module up that I just compiled
that a PR with extpgm. I changed it to one that didn't exist and it still

compiled. This value must only be checked at run time. I always assumed,

like you David, that the compiler would have done a verification. It
obviously isn't doing any kind of binding to that external program if this

is the case so it doesn't matter to the Module when it gets created. I
would recommend that it be there before you use the module to call it
though ;)


Thanks
Bryce Martin
Programmer/Analyst I
Ext. 4777



Alan Campin <alan0307d@xxxxxxxxx>
Sent by: rpg400-l-bounces@xxxxxxxxxxxx
05/22/2009 10:22 AM
Please respond to
RPG programming on the IBM i / System i <rpg400-l@xxxxxxxxxxxx>


To
"RPG programming on the IBM i / System i" <rpg400-l@xxxxxxxxxxxx>
cc

Subject
Re: EXTPGM keyword






The compiler just want some value. It doesn't seem to care what it is.

On Fri, May 22, 2009 at 8:20 AM, David FOXWELL
<David.FOXWELL@xxxxxxxxx>wrote:

Hi,

I just opened up a source member that I need to modify and found this.


D Prc PR EXTPGM ( 'XXX210' )

D Parm1 etc

D Parm2 etc



D Prc PI

D Parm1 etc

D Parm2 etc

Just realised I don't fully understand EXTPGM as XXX210 is obviously an
error. The source, module and program are all named XXX110.

Would somebody care to enlighten me?

Thanks.

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