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I disassembled a simple program written in C++ and there are these two function names. I guess that ctor means constructor and dtor means destructor, and word global maybe means that they create and destroy global objects. I cannot guess the name aux. What do these two functions do?
The addresses of constructors and destructors of static objects are each stored in a different section in ELF executable. for the constructors there is a section called .CTORS and for the destructors there is the .DTORS section.
the compiler creates two auxillary functions __do_global_ctors_aux and __do_global_dtors_aux for calling the constructors and destructors of these static objects, respectively.
__do_global_ctors_aux function simply performs a walk on the .CTORS section, while the __do_global_dtors_aux does the same job only for the .DTORS section which contains the program specified destructors functions.