× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.



Dennis;

Here are two errNo procedures I use regularly. You could probably compile the errNo procedure right out of the box, errNoTrap uses several messaging functions, which I can attach if you are interested, or you can modify it any way you wish.

One note, although the errNo procedure allows you to assign a value to the errNo memory, but it is not recommended to do so, generally.

These are the prototypes that are contained in the SVS9998 include.
D errNo PR 10I 0
D 10I 0 Const Options(*NOPASS)

D errNoTrap PR 10I 0
D 10I 0 Const Error Number
D 100A Const Varying Function Name
D 10A Const Options(*NOPASS) Message Type
D 256A Const Varying Options(*NOPASS) Call Stack Entry


errno()
http://code.midrange.com/008d29b820.html

errNoTrap()
http://code.midrange.com/f97f8f9e12.html

Duane Christen

--


Duane Christen
Senior Software Engineer
(319) 790-7162
Duane.Christen@xxxxxxxxxx

Visit PAETEC.COM


-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Dennis Lovelady
Sent: Wednesday, October 13, 2010 11:37 AM
To: 'RPG programming on the IBM i / System i'
Subject: Safe to maintain pointer to errno() ?

Folks, I have often wondered and have never found reference to the internal workings of errno. My specific question is whether it is safe to obtain a pointer to errno only one time, and then reference the based value from then on. It makes sense to me that errno's value would be at a static location and won't float around in memory, but - again - I haven't seen any guarantee of that. So in my programs every time I want to measure success of certain operations, it's the old retrieve-the-address-and-test-the-value approach.
This really is like the C approach except that in C it can be a single instruction ( if (*errno < 1) . ).



Any takers from folks in the know?



Dennis E. Lovelady
AIM/Skype: delovelady MSN: fastcounter@xxxxxxxxxxxx
<http://www.linkedin.com/in/dennislovelady>
www.linkedin.com/in/dennislovelady --
Using Windows is better than eating glass*
- *Depending upon the quality of the glass.



--
This is the RPG programming on the IBM i / System i (RPG400-L) mailing list To post a message email: RPG400-L@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/rpg400-l
or email: RPG400-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives at http://archive.midrange.com/rpg400-l.


As an Amazon Associate we earn from qualifying purchases.

This thread ...

Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.