1  #include <stdio.h>
       2  #include <dlfcn.h>
       3  
       4  int bar = -20;
       5  
       6  int 
       7  main (void)
       8  {
       9    int ret = 0;
      10    void *handle;
      11    void (*fcn) (void);
      12  
      13    handle = dlopen("./tmpdir/libdl6a.so", RTLD_GLOBAL|RTLD_LAZY);
      14    if (!handle)
      15      {
      16        printf("dlopen ./tmpdir/libdl6a.so: %s\n", dlerror ());
      17        return 1;
      18      }
      19  
      20    fcn = (void (*)(void)) dlsym(handle, "foo");
      21    if (!fcn)
      22      {
      23        printf("dlsym foo: %s\n", dlerror ());
      24        ret += 1;
      25      }
      26    else
      27      {
      28        (*fcn) ();
      29      }
      30  
      31    dlclose (handle);
      32    return ret;
      33  }