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Hi,

As far as the IFS use goes, I opened a call log with IBM support on this at end of last year. I could not find a way to exclusively lock an IFS file to prevent OTHER processes from accessing it or destroying it. I believe if everyone is 'playing nice' and all using the same way to access the file and checking results of open() it is different - but if you want it locked exclusively because you are not sure how someone else might access it, that seems to not work. I was creating a file and tried to open it with some locking in the open( ) ... I tested this ... but I could even delete it from another job while mine first one was 'locking' it and I wanted to prevent exactly this sort of thing from happening. The support center was unable to give me an API or function call to truly lock it from other processes in the same way that ALCOBJ protects 'normal' native iSeries non-IFS objects. I ended up changing to use non-IFS objects on the system. I guess it
depends on the purpose of your code.

Thanks,

Genyphyr Novak




On Mon, Feb 2, 2009 at 11:32 AM, Elvis Budimlic
<ebudimlic@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
If IFS stream file, check out open() function's O_SHARE_NONE flag.
If native (library) file system, check out ALCOBJ command.

Hth, Elvis

Celebrating 11-Years of SQL Performance Excellence on IBM i, i5/OS and
OS/400
www.centerfieldtechnology.com


-----Original Message-----
Subject: [C400-L] C/C++ File Locking

I am new to the iSeries but not C/C++. I am porting a program that runs
on multiple platforms. This program may have several instances running
concurrently but each program shares on data file. My issue is what
function do I use to lock the file so that other apps can not read/write
this file while it is being locked by another process. On windows I
used CreateFile() and on UNIX I used Flock(). I am looking for
something similar or that will at least produce the same results. I
have attempted modifying the share permissions in the CL but this locks
the file for the entire run of the program and not only when this file
is open.


Thanks,

Edgar Gillock
ed_gillock@xxxxxx




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