I just played around with this some more (I somehow had the feeling that you know what you're doing... ;)  and I can now reproduce the problem. Initially, I had rather short content in my dummy SQL_REPORT_ID sections. So, to simulate longer read times, I added a sleep 1 like this 

      ...

      while (<$fh>) {
         last if (/END SQL_REPORT_ID/) ;

         $Sql .= "$_";
      }
      sleep 1;

      ...

[download]

and now I'm getting this (when doing print STDERR "Generated $ReportId: $Sql"; in the child): 

Generated 1: foo 1
Generated 2: foo 2
Generated 3: foo 3
Generated 4: foo 4
Generated 2: foo 2
Generated 3: foo 3
Generated 4: foo 4
(2..4 repeated ad infinitum...)

[download]

This is on HP-UX (no difference between 11.00, 11.11 and 11.23) — on Linux, however, everything is fine. I'll try other platforms later and report back...

For the record, my test file contains: 

SQL_REPORT_ID 1
foo 1
END SQL_REPORT_ID

SQL_REPORT_ID 2
foo 2
END SQL_REPORT_ID

SQL_REPORT_ID 3
foo 3
END SQL_REPORT_ID

SQL_REPORT_ID 4
foo 4
END SQL_REPORT_ID

[download]

Update: in case anyone is interested, here are the results for a couple of other platforms I could find:

No problem on

but same problem as on HP-UX, on

(don't know what to make of it, yet...)

In reply to Re^3: HPUX corruption of file handle after fork by almut
in thread HPUX corruption of file handle after fork by Abe

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