I have not gotten it to work yet, but I think I may have found the answer:

http://www-1.ibm.com/servers/enable/site/porting/iseries/overview/faq_files.html

In ILE, when I tried fopen(), fclose(), etc. on IFS stream files in
QOpenSys they do not seem to work, but the low level calls do not have
any problems. Is there any difference in these two types of calls?

Yes. The two types of calls are different in the ILE environment. The
calls like fopen(), fclose(), fread() work on the database files
whereas low-level calls like open(), close(), read() work on the
stream files. The low level calls can work on the database files by
specifying the full qualified name (i.e. /qsys.lib/< library>.lib/<
file>.file/< mbr>.mbr). Calls like fopen(), fclose, and fread() can
also work on the stream files in QOpenSys if *IFSIO is specified for
"System Interface Option" on CRTCMOD command. Once the program is
created with *IFSIO option absolute or relative path names can be
specified with fopen(), fclose() etc calls. However, after specifying
*IFSIO these call will not work on the native database file system
even if fully qualified path name is specified.




On Fri, 18 Mar 2005 14:11:22 -0600, Elvis Budimlic
<ebudimlic@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> Perhaps if you compile your module with SYSIFCOPT(*IFSIO)?
> 
> Elvis
> 
> -----Original Message-----
>  Subject: Re: [C400-L] DB2 UDF written in C
> 
> Working:
>      select debugout( 'pgmrfillib/what', 'Hello' ) from sysibm/sysdummy1
> 
> Not working:
>      select debugout( '/tmp/out.txt', 'Hello' ) from sysibm/sysdummy1
> 
> How can I get fopen to work with the IFS ?
> 
> -Steve More
> 
> _______________________________________________
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