Use __wrap_malloc in a shared library

I created a shared library in Linux that calls malloc wrapper which is the __wrap_malloc.

void * __wrap_malloc( size_t size )
{
   printf("Test\n");
   return __re开发者_运维百科al_malloc( size );
}

Then the shared library was generated successfully.

But when I use the shared library and build the application. The linker gives me "undefined" error message,

undefined reference to `__wrap_malloc'

Is is possible to call __wrap_malloc() function in a shared library?

Please advice.

Many thanks.

You are probably not using the --wrap option to ld correctly. Without more information about what command line you were using it is impossible to determine what was going wrong.