I'M doubting a lot about doing a refactor on a

Question

I'M doubting a lot about doing a refactor on a

plugin system I'm writing, I have the following architecture:

program.exe // contains the main and it's linked dynamically to core.so

core.so // contains the plugin system manager and the host functionality

plugin.so // it's a plugin, not linked to anything, dynamically loaded by core.so

I'm doubting how to expose the host functionality to the plugins:

1) Rely on the linker (I fear this option because it may not be portable)

2) Rely on dlsym/GetProcAddress over the current process

3) Inject with a struct of pointers to functions the API from the host to the plugin in the initialization / register entry point

1 and 2: May work without big refactors but may not be portable
3: May imply a fully refactor of all plugins

What do you think about it? What option would you choose? Do you know any other option?

PD: All exposed APIs (plugins/host) are written in C for improving portability.