text: #include <dlfcn.h>
  #include <mcheck.h>
  #include <stdio.h>
  #include <stdlib.h>
  
  int
  main (void)
  {
    void *h1;
    void *h2;
    int (*fp) (void);
    int *vp;
  
    mtrace ();
  
    /* Open the two objects.  */
    h1 = dlopen ("reldepmod1.so", RTLD_LAZY | RTLD_GLOBAL);
    if (h1 == NULL)
      {
        printf ("cannot open reldepmod1.so: %s\n", dlerror ());
        exit (1);
      }
    h2 = dlopen ("reldepmod2.so", RTLD_LAZY);
    if (h2 == NULL)
      {
        printf ("cannot open reldepmod2.so: %s\n", dlerror ());
        exit (1);
      }
  
    /* Get the address of the variable in reldepmod1.so.  */
    vp = dlsym (h1, "some_var");
    if (vp == NULL)
      {
        printf ("cannot get address of \"some_var\": %s\n", dlerror ());
        exit (1);
      }
  
    *vp = 42;
  
    /* Get the function `call_me' in the second object.  This has a
       dependency which is resolved by a definition in reldepmod1.so.  */
    fp = dlsym (h2, "call_me");
    if (fp == NULL)
      {
        printf ("cannot get address of \"call_me\": %s\n", dlerror ());
        exit (1);
      }
  
    /* Call the function.  */
    if (fp () != 0)
      {
        puts ("function \"call_me\" returned wrong result");
        exit (1);
      }
  
    /* Now close the first object.  If must still be around since we have
       a implicit dependency.  */
    if (dlclose (h1) != 0)
      {
        printf ("closing h1 failed: %s\n", dlerror ());
        exit (1);
      }
  
    /* Try calling the function again.  This will fail if the first object
       got unloaded.  */
    if (fp () != 0)
      {
        puts ("second call of function \"call_me\" returned wrong result");
        exit (1);
      }
  
    /* Now close the second file as well.  */
    if (dlclose (h2) != 0)
      {
        printf ("closing h2 failed: %s\n", dlerror ());
        exit (1);
      }
  
    /* Finally, open the first object again.   */
    h1 = dlopen ("reldepmod1.so", RTLD_LAZY | RTLD_GLOBAL);
    if (h1 == NULL)
      {
        printf ("cannot open reldepmod1.so the second time: %s\n", dlerror ());
        exit (1);
      }
  
    /* And get the variable address again.  */
    vp = dlsym (h1, "some_var");
    if (vp == NULL)
      {
        printf ("cannot get address of \"some_var\" the second time: %s\n",
  	      dlerror ());
        exit (1);
      }
  
    /* The variable now must have its originial value.  */
    if (*vp != 0)
      {
        puts ("variable \"some_var\" not reset");
        exit (1);
      }
  
    /* Close the first object again, we are done.  */
    if (dlclose (h1) != 0)
      {
        printf ("closing h1 failed: %s\n", dlerror ());
        exit (1);
      }
  
    return 0;
  }
  