Re: apitrace: undefined reference to `__libc_dlopen_mode', `__libc_dlsym'

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On 7/25/21 4:28 AM, Florian Weimer wrote:
> * Sandro Mani:
> 
>> I'd need help with the following issue with apitrace, which failed the
>> mass rebuild with:
>>
>> apitrace-9d42f667e2a36a6624d92b9bd697de097cc4e619/wrappers/dlsym.cpp:70:
>> undefined reference to `__libc_dlopen_mode'
>> apitrace-9d42f667e2a36a6624d92b9bd697de097cc4e619/wrappers/dlsym.cpp:72:
>> undefined reference to `__libc_dlsym'
>>
>> The code triggering this is below. Have these symbols disappeared from
>> libc resp is there any alternative?
> 
> These internal GLIBC_PRIVATE symbols are gone and won't come back.
> 
> Not sure why this code isn't using RTLD_NEXT.
> 

Because they're interposing dlsym itself and attempting to call dlsym(RTLD_NEXT, ...)
resolves to the interposed dlsym function and dies due to infinite recursion.

> We are working on improving LD_AUDIT support, which is the plugin API of
> the dynamic loader.  It can in theory be used to implement such things.
> But API tracing is probably best implemented within the traced libraries
> themselves, rather than on the side.
> 

This isn't viable when you have multiple libraries from different vendors, some
or all of which are beyond your control.
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