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  1.  Home
  2. RPG400-L
  3. October 2014

RE: tmpnam() not unique

Two timestamps created with the same value - that sounds OK to me ?

I think you have a different issue.

I'm referring to tmpnam() which returns an IFS filename. I was expecting this to be unique but it seems that it is not.



-----Original Message-----
From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Gary Thompson
Sent: 14 October 2014 14:33
To: RPG programming on the IBM i (AS/400 and iSeries)
Subject: RE: tmpnam() not unique

I've encountered the condition where two timestamps are created with the same value.

My "fix" was to attempt to write the TS value to a uniquely keyed file and if a duplicate key error resulted, the time stamp value would be incremented by a small fraction and the write retried until a unique value was created . . .

-----Original Message-----
From: RPG400-L [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of McGovern, Sean
Sent: Tuesday, October 14, 2014 7:20 AM
To: rpg400-l@xxxxxxxxxxxx
Subject: tmpnam() not unique

I've believe I have encountered an issue with my use of tmpnam().

If 2 jobs use tmpnam() at the same timestamp moment, I *think* the same filename is returned (though I don't know how to test this scenario).

I haven't coded to handle this possibility, and end up with two jobs trying to create the same temporary IFS file.

I was thinking that a solution could be just prefix/suffix the job number to the filename returned by tmpnam().

Does that seem like a feasible solution ?


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