mr4th-dynamic-linking/xlist/base.c

// base symbols shared

#if defined(BASE_IMPLEMENTOR)

#include <stdio.h>

int x = 0;

void
base_func(void){
  printf("x = %d\n", x);
  x += 1;
}

#endif


// dynamic function linkage protocol

#if defined(BASE_IMPLEMENTOR)

EXPORT_SYMBOL BASE_Funcs*
base_export_functions(void){
  static BASE_Funcs funcs = {0};
  if (funcs.base_func == 0){
#define X(N,R,P) funcs.N = N;
#include "base.xlist.h"
#undef X
  }
  return(&funcs);
}

#endif


#if !defined(BASE_IMPLEMENTOR)

#if OS_WINDOWS
# include <Windows.h>
#elif OS_LINUX
# include <dlfcn.h>
#endif

BEFORE_MAIN(base_dynamic_user_init){
  BASE_Funcs *funcs = 0;
  
#if OS_WINDOWS
  HMODULE module = LoadLibraryA("base.dll");
  if (module != 0){
    BASE_ExportFuncs *base_export_functions = (BASE_ExportFuncs*)GetProcAddress(module, "base_export_functions");
    if (base_export_functions != 0){
      funcs = base_export_functions();
    }
  }
#elif OS_LINUX
  void *module = dlopen("$ORIGIN/base.so", RTLD_NOW);
  if (module != 0){
    BASE_ExportFuncs *base_export_functions = (BASE_ExportFuncs*)dlsym(module, "base_export_functions");
    if (base_export_functions != 0){
      funcs = base_export_functions();
    }
  }
#else
# error base_import_functions not completed for this OS
#endif
  
#define X(N,R,P) N = funcs->N;
#include "base.xlist.h"
#undef X
}

#endif