I agree with you on this, but if the perl and c program are compiled under the same setting, most likely this is not a problem. But you are right, this is definitely something should be taken care of.
The original perl code actually does not import constants defined in FCntl properly. That is a big problem, and messed up the values he tried to set in the lock structure. You can not simply say "use FCntl", as FCntl does not export those contants by default.
His pack format might be wrong, but I cannot say that for sure. Although his pack format is different from mine, but as you said, that might matches the lock structure on his computer. That's up to darkomen to check.
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