RE: [EXTERNAL] Re: Using _C_IFS_fopen and _C_IFS_fgets to read files in the ifs

Hi Jon
I was able to FINALLY find time to implement what you suggested

My problem was that the program is not closing the files and eventually it reaches a maximum number of files already open
Im hoping that someone can see what I am doing wrong with my opens and closes
Here is my pertinent code

0196.00 PathFile2read = %trim(PriorPathfile) + x'00' ;
0197.00 OpenMode = 'r' + x'00' ;
0198.00 FilePtr = OpenFile(%addr(PathFile2read):%addr(OpenMode)) ;
0199.00
0200.00 perrno = get_errno; // Now the errno value is visible is visible in c_errno
0201.00 perrorString = strerror(c_errno);
0202.00
0203.00 if (FilePtr = *null) ;
0204.00 CannotreadPriorBAI2();
0205.00 return;
0206.00 endif ;
0207.00
0208.00 dow (ReadFile(%addr(RtvData):32767:FilePtr) <> *null) ;
0209.00 RtvData = %xlate(x'00':' ':RtvData) ; //End of record null
0210.00 RtvData = %xlate(x'25':' ':RtvData) ; //Line feed (LF)
0211.00 RtvData = %xlate(x'0D':' ':RtvData) ; //Carriage return (CR)
Some logic here
0236.00 enddo ;
0237.00 CloseFile(%addr(PathFile2read));
0238.00 perrno = get_errno; // Now the errno value is visible is visible in c_errno
0239.00 perrorString = strerror(c_errno);

When I look at the field errorString after line 239.00, the value is
File is not open.
And the field C_ERRNO = 3004



Alan Shore
Solutions Architect
IT Supply Chain Execution

[cid:image002.png@01D782DB.5679CAB0]

60 Orville Drive
Bohemia, NY 11716
Phone [O] : (631) 200-5019
Phone [C] : (631) 880-8640
E-mail : ASHORE@xxxxxxxxxxxxxxxxxxxx

'If you're going through hell, keep going.'
Winston Churchill

From: Alan Shore
Sent: Sunday, July 25, 2021 5:41 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: [EXTERNAL] Re: Using _C_IFS_fopen and _C_IFS_fgets to read files in the ifs

Thanks for your reply Jon
I'm assuming the error is on the open, as the check for null is directly after the open

Thanks for the code to get the error
I will look to applying this in the morning



Sent via the Samsung GALAXY S(r) 5, an AT&T 4G LTE smartphone


-------- Original message --------
From: Jon Paris <jon.paris@xxxxxxxxxxxxxx<mailto:jon.paris@xxxxxxxxxxxxxx>>
Date: 7/25/21 17:12 (GMT-05:00)
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx<mailto:midrange-l@xxxxxxxxxxxxxxxxxx>>
Subject: [EXTERNAL] Re: Using _C_IFS_fopen and _C_IFS_fgets to read files in the ifs
Is the pointer set by the open? Or is it null?

You say it can't be read but you're not testing to see if it was actually opened.

Whether the failure is on the open or the read you should be looking at the value of errno to determine what the system think s the problem is.

If you don't know how to do this ...

Dcl-pr get_errno Pointer ExtProc('__errno'); // Note _double_ underscore

Dcl-s c_errno Int(10) based(perrno);

perrno = get_errno; // Now the errno value is visible is visible in c_errno

// To get the text value
Dcl-pr strerror pointer ExtProc('strerror');
errno Int(10) Value;
End-Pr;

Dcl-s errorString Char(100) Based(perrorString);

perrorString = strerror(c_errno);


Jon Paris

On Jul 25, 2021, at 2:39 PM, Alan Shore via MIDRANGE-L <midrange-l@xxxxxxxxxxxxxxxxxx<mailto:midrange-l@xxxxxxxxxxxxxxxxxx>> wrote:

Hi everyone
I just re-read my e-mail and realized that it is misleading
Using that web site -
A better way to read a file in the IFS with RPG @ RPGPGM.COM<https://www.rpgpgm.com/2016/03/a-better-way-to-read-file-in-ifs-with.html<https://www.rpgpgm.com/2016/03/a-better-way-to-read-file-in-ifs-with.html>>
The problem is with the the OpenFile

Here is the pertinent code

dcl-pr OpenFile pointer extproc('_C_IFS_fopen') ;
*n pointer value ; //File name
*n pointer value ; //File mode
end-pr ;

dcl-pr ReadFile pointer extproc('_C_IFS_fgets') ;
*n pointer value ; //Retrieved data
*n int(10) value ; //Data size
*n pointer value ; //Misc pointer
end-pr ;

dcl-pr CloseFile extproc('_C_IFS_fclose') ;
*n pointer value ; //Misc pointer
end-pr ;


PathFile2read = %trim(PriorPathfile) + x'00' ;
OpenMode = 'r' + x'00' ;
FilePtr = OpenFile(%addr(PathFile2read):%addr(OpenMode)) ;

if (FilePtr = *null) ;
CannotreadPriorBAI2();
return;
endif ;



Alan Shore
Solutions Architect
IT Supply Chain Execution

[cid:image001.png@01D78162.E7C4C710]

60 Orville Drive
Bohemia, NY 11716
Phone [O] : (631) 200-5019
Phone [C] : (631) 880-8640
E-mail : ASHORE@xxxxxxxxxxxxxxxxxxxx<mailto:ASHORE@xxxxxxxxxxxxxxxxxxxx>

'If you're going through hell, keep going.'
Winston Churchill

From: Alan Shore
Sent: Sunday, July 25, 2021 1:26 PM
To: midrange-l@xxxxxxxxxxxxxxxxxx<mailto:midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Using _C_IFS_fopen and _C_IFS_fgets to read files in the ifs

Hi everyone
We are on V7r3
We have a number of files in the ifs that I am attempting to use _C_IFS_fopen, _C_IFS_fgets and _C_IFS_fclose to read
Please see the following web page
A better way to read a file in the IFS with RPG @ RPGPGM.COM<https://www.rpgpgm.com/2016/03/a-better-way-to-read-file-in-ifs-with.html<https://www.rpgpgm.com/2016/03/a-better-way-to-read-file-in-ifs-with.html>>

I have a situation where one of the files is not read by these utilities
Does anyone know how I can determine why?
I am able to go into that file using wrklnk and edtf - so I believe its NOT an authority situation

However, the program is not able to read the rest of the files AFTER that one
I can sign off, sign back in, change the program to start AFTER that one particular file, and the rest of the files can be read
So I am assuming that something needs to be initialized after such a read, but In am unable to find anything as to what that could possibly be
Does anyone have any knowledge of such a situation and how to rectify it?

As always - all answers gratefully accepted

Alan Shore
Solutions Architect
IT Supply Chain Execution

[cid:image003.png@01D78162.E7C4C710]

60 Orville Drive
Bohemia, NY 11716
Phone [O] : (631) 200-5019
Phone [C] : (631) 880-8640
E-mail : ASHORE@xxxxxxxxxxxxxxxxxxxx<mailto:ASHORE@xxxxxxxxxxxxxxxxxxxx<mailto:ASHORE@xxxxxxxxxxxxxxxxxxxx%3cmailto:ASHORE@xxxxxxxxxxxxxxxxxxxx>>

'If you're going through hell, keep going.'
Winston Churchill

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