Hello again,

The problem is solved, but I have to confess I still don't know what was causing it.
I followed sgifford's idea and oddingly got 513 as a result. On all systems, I got access to, the result was 577.

As I had to finish the code and have it working by this afternoon, I gave up proper debugging and blindly reinstalled relevant modules. (I know, I know - shame on me!)
Fresh Fcntl.pm install fixed my problem.
It wasn't an issue with the Perl binary package in Slackware - default package was removed and Perl 5.8.2 was installed from the source code.
I cannot guarantee nobody was messing with Fcntl.pm module (not only I have access to this system), but it seemed to me so improbable and absurd that I didn't bother with checking it.

Anyhow, I would like to thank all of you for your help and ideas, and also say sorry for not fixing it the proper way finding the source of the problem.

Unfortunatelly this time (even though the problem is fixed):
sheep - perl : 0 - 1
But I will see you again perl!

-sheep

In reply to open vs. sysopen SOLVED (partially) by sheep
in thread open vs. sysopen by sheep

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