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Hi, Brian and all Here is a good link suggesting why one should be cautious in using RTLD_GLOBAL on Linux: http:[log in to unmask] Cheers, Derek On 09/16/10 20:52, Brian Bockelman wrote: > Hi, > > In XrdSysPlugin.cc, dlopen() is only called with the RTLD_NOW option. This is causing problems for something I'm working on. > > I'm currently implementing LCMAPS authorization for GSI which needs to: > > 1) Load the libXrdLcmaps library (which is linked against liblcmaps) [DONE] > 2) Call the lcmaps_init function [DONE] > 3) lcmaps then loads its plugins. For some security reason (which I don't know), the plugins are not linked against liblcmaps itself but use its symbols. > > Normally, step (3) is fine because the liblcmaps symbols are in the global namespace. *However*, since xrootd loads liblcmaps without the RTLD_GLOBAL option, the liblcmaps symbols are not available and the dlopen fails at (3). > > What's the reasoning behind not passing RTLD_GLOBAL? Or has it just never come up? > > Brian > > -- Dr. Derek Feichtinger Tel: +41 56 310 47 33 AIT / Scientific Computing email: [log in to unmask] PSI CH-5232 Villigen PSI