RE: 3440:Operation not supported when trying to read an IFS file.

["Larry Ducie" <Larry_Ducie@xxxxxxxxxxx>]

Hi Emannuel,
 
It is really important that you get your flags right.
 
In Pr_SetFile you set oflag (open flags) to:
 
Oflag = O_CREAT + O_CODEPAGE + O_RDWR + O_TRUNC;
 
This isn't right, it will CREATE(O_CREAT) a new file, or empty an existing
file (O_TRUNC), and may not be what you want when trying to read a file. :-)
 
You then open the file at this point.
 
You then attempt to open the file again in Pr_OpnFile, but this time you set
oflag to:
 
Oflag = O_WRONLY + O_TEXTDATA;

 
This is also incorrect, if you're going to read the file, because you've
opened it for WRITE ONLY (O_WRONLY).
 
Basically, it looks like you've copied the code for writing to a file, and
you're now attempting to use it for reading. This wont work because the
flags are not right.
 
As a first stab - I'd get rid of the second open completely and remove
O_CREAT and O_TRUNC from the first open.
 
Try it then and see what you get.
 
Alternatively, look here:
http://publib.boulder.ibm.com/iseries/v5r2/ic2924/index.htm?info/apis/apifin
der.htm for the open API to get a complete list of flags and modes.
 
I'm not at work at the moment, but I'll post the complete code you need in
the morning, if nobody else picks this up.
 
Cheers
 
Larry Ducie