gelf_getsym
GElf_Sym *gelf_getsym(Elf_Data *_src, int _index, GElf_Sym *_dst);
if (gelf_getsym(d, ndx, dst) == 0)
if (gelf_getsym(data, i, &sym) != &sym)
if (gelf_getsym(data, i, &sym) == NULL)
if (gelf_getsym(data, i, &sym) != &sym)