C --> malloc --> dlsym

I have used dlsym() to invoke my version of malloc, instead of the default library malloc:

 lt_malloc = (void*(*)(size_t))dlsym(RTLD_NEXT, "malloc");
 TRACE((stderr, "initialize: lt_mall开发者_Python百科oc=%p\n", lt_malloc));
 if (!lt_malloc) {
     fprintf(stderr, "LeakTracer: could not resolve 'malloc' in 'libc.so': %s\n", dlerror());
     exit(1);
 }

Now after certain time, may be a timer or so, i want to revert back to the original version of malloc (libc library malloc). How can i do that?

Thanks in advance.

---

Does the above code mean 1) you have called your malloc also malloc? 2) or that you assign the libc malloc to lt_malloc?

The code above suggests that lt_malloc is the libc malloc so the "original" malloc. Well you than probably have some either some macros or a function

So then you switch as easily as my_malloc = libc_malloc my_malloc = my_debug_malloc

and you just call my_malloc

If that is not helpful please explain the posted code and what you expect at "ente codde here"

---

You should rather use dlopen on the library containing your malloc function and use the handle from dlopen as a first argument to dlsym.

Alternatively, you can use LD_PRELOAD.