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Date: Thu, 15 Mar 2018 10:40:15 -0400
From: Rich Felker <>
Subject: Re: How to test if dlclose is a no-op?

On Thu, Mar 15, 2018 at 08:32:34AM -0500, Thadeus Fleming wrote:
> In the spirit of not “assum[ing] a certain implementation has
> particular properties rather than testing,” how can one test if
> dlclose is a no-op, as it is in musl, without breaking things if it
> isn’t?

This sounds like an XY problem¹. Do you care about whether you can
recover virtual memory space, whether the underlying fs objects remain
referenced, whether there's a cycle of dtors and ctors running, or
something else?

FYI there is no clear answer to the question even on other
implementations. glibc only sometimes unloads; there are corner cases
and race-type conditions where unloading is impossible for them. You
really should not be designing around an assumption/requirement that
anything get unloaded.



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