Symbol addr to library handle?

[candy76041820]

I need to pass one library handle to another (non-Qt) one, but QLibrary hides the handle. On Windows I can recover it with GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS, reinterpret_cast<const TCHAR *>(ptr_to_func_in_lib), &lib_handle), but how can I do this on Linux?

Assume that I have qLib.setLoadHints(QLibrary::ExportExternalSymbolsHint):

1. If I should be using dladdr(), is Dl_info::dli_fbase suitable for subsequent dlsym() calls in the other non-Qt library?
2. Or should I dlopen(qLib.fileName().toLocal8Bit().data()) again, hoping it will return the exact same value (representing the loaded instance of that so)?