1  #include <dlfcn.h>
       2  #include <stdio.h>
       3  #include <stdlib.h>
       4  
       5  extern int call_me (void);
       6  
       7  int
       8  call_me (void)
       9  {
      10    int (*fp) (void);
      11  
      12    fp = dlsym (RTLD_DEFAULT, "foo");
      13    if (fp == NULL)
      14      {
      15        printf ("cannot get address of foo in global scope: %s\n", dlerror ());
      16        exit (1);
      17      }
      18  
      19    return fp () - 42;
      20  }