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Comments:

(1) RLIM_INFINITY is used unconditionally elsewhere in the
module, so the #ifdef is unnecessary.

(2) The extra #if/#endif around the closing curly is ugly.
I'd avoid this by moving the corresponding opening curly
outside the first block.

(3) resource.RLIM_INFINITY is -1 on my system too. But does
that matter? This is just a symbolic constant to be used to
set limits to infinit, and if it happens to be -1, who
cares? It's got 32 1-bits, which is what counts.

So I'd accept it.