Web Reference: Jan 1, 2022 · When a name is given as an argument to dlsym, dlsym returns the address of the named thing. So, for "func", it returns the address of the function named func. For "func_p", it returns the address of the pointer named func_p. The correct way to distinguish an error from a symbol whose value is NULL is to call dlerror (3) to clear any old error conditions, then call dlsym (), and then call dlerror (3) again, saving its return value into a variable, and check whether this saved value is not NULL. The problem is that the function pointer will still be resolved at compile time, but merely point to the plt (Procedure Linkage Table) section of the original object (which dispatches the call after asking the dynamic linker to resolve the symbol).
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