shared libraries - Receive "undefined symbol" error when loading library with dlopen -

I am writing some code that uses dynamic shared libraries as plugins.

My command line for building looks like shared libraries:

  cc -shared -fPIC -o module.so -g-wall module.c  

Within the module, I can call the function that is in another shared library that is loaded in the main executable.

Although I have the executable function (i undefined symbol errors).

dlopen My call looks like this:

  zero * handle = DLPN (plugin, RTLD_NOO); Can someone please advise how can my modules call back to my executable, without putting all executable utility functions into another shared library?   
 
 
 The right solution to add  -dynamic  to the main executable link command It will add the appropriate option for  ld  (which happens to be  - export-dynamic  when using  GNU ld ). 
 
 is technically incorrect: adding  - export-dynamic  is a linkir option, and so it is  -Wl, - export-dynamic , Or  -Wl, -E . It is less portable than  - dynamic  (equivalent to other linkers, but the options themselves are different).