Should be as simple as: 

my $sizeRead = $chunkSize;
while ($sizeRead == $chunkSize)
{
  $sizeRead = read $in_fh, $buffer, $size;
  die "Error reading: $!\n" unless defined $sizeRead;
  ...
}

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In reply to Re^3: Chunking very large files by SuicideJunkie
in thread Chunking very large files by hiptoss

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