Re: Problem with dlsym

Subject: Re: Problem with dlsym
From: "Jordan K. Hubbard" <email@hidden>
Date: Thu, 12 May 2005 14:49:25 -0700

We have been using the 'dlcompat' library on OSX for a while and it
worked great. However, with Tiger 10.4, it appears that the dl
functions (eg: dlsym) are now built in. Unfortunately, when we try to
find a non-existent symbol in one of our large shared libraries, it
now takes forever (instead of returning null fairly
quickly/immediately). After about 20 minutes of 'working' on the
dlsym call, our program will return and say that it couldn't find the
symbol. When we used dlcompat before, we didn't have this problem.
We have read the man page and tried all the different options that are
presented, but nothing seems to help.

And the answer is that this is a known bug ("rdar://problem/4057081 infinte loop in dlsym(RTLD_NEXT, ) when symbol not found.", JFYI for those with radar access).

According to the developer, it only happens when there are circular dependencies with libraries. The work around is 1) remove the circular dependency, or 2) use dlsym(RTLD_DEFAULT, "xxx") instead of RTLD_NEXT.

- Jordan

Jordan K. Hubbard

Engineering Manager, BSD technology group

Apple Computer

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