RE: IFS API Documentation

[Buck Calabro <Buck.Calabro@xxxxxxxxxxxx>]

John Perry wrote:
>I've looked and asked and can't find definitive documentation on the IFS 
>API's as thay are used from within RPG on the AS400.
-snip-

I always supposed that the state of the IFS documentation is a result of the
IFS being "ported" as it were, to the 400.  The IFS is for all intents and
purposes a Unix-like file system.  That means that just about any C book
would explain the particulars of open, read, write and close.  On the 400,
the Unix API manual is probably the official reference although I'd be
remiss if I failed to mention the Redbook "Who knew you could do that..."

When you look at any C based documentation, bear in mind the fact that C
programmers use constants in system header files for things like O_TEXTDATA.
You may never find a manual reference to the actual value of O_TEXTDATA; for
that you'll have to poke through the C header files.  They're located in
QCLE and QSYSINC.  The main ones are named H and SYS, although there are
more than that.

An alternative is to compile a C program and turn on ALL the documentation
flags so you can see the includes in the listing.  This may well work on a
PC as well as the 400 but I'm out of my depth there...

Buck Calabro
Commsoft; Albany, NY
"Nothing is so firmly believed as
 that which we least know" -- Michel Montaigne
Visit the Midrange archives at http://www.midrange.com
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