plugin/src/main.c

#include <stdio.h>
#include <unistd.h>
#include <dlfcn.h>

#include "plug.h"

int
main (void)
{
  int x = 0;
  char * libplug_fn = "libplug.so";
  void * libplug = NULL;
  while (1)
  {
    if (libplug) { dlclose(libplug); }
    libplug = dlopen(libplug_fn, RTLD_NOW);
    BIND(libplug, plug, "plug");
    if (!libplug)
    { fprintf(stderr, "ERR: Cannot load dynamic library %s: %s\n", libplug_fn, dlerror()); }
    else
    {
      *(void **) (&plug) = dlsym(libplug, "plug");
      printf("frame %d: ", x++);
      if (plug)
      { plug(); }
      else
      { fprintf(stderr, "ERR: Cannot find %s symbol in %s: %s\n", "plug", libplug_fn, dlerror()); }
    }
    sleep(2);
  }
}