1  #include <dlfcn.h>
       2  #include <mcheck.h>
       3  #include <stdio.h>
       4  #include <stdlib.h>
       5  
       6  
       7  int
       8  main (void)
       9  {
      10    void *p1;
      11    void *p2;
      12    int (*fp) (void);
      13    int result;
      14  
      15    mtrace ();
      16  
      17    p1 = dlopen ("dblloadmod1.so", RTLD_LAZY);
      18    if (p1 == NULL)
      19      {
      20        printf ("cannot open dblloadmod1.so: %s\n", dlerror ());
      21        exit (EXIT_FAILURE);
      22      }
      23  
      24    p2 = dlopen ("dblloadmod2.so", RTLD_LAZY);
      25    if (p1 == NULL)
      26      {
      27        printf ("cannot open dblloadmod2.so: %s\n", dlerror ());
      28        exit (EXIT_FAILURE);
      29      }
      30  
      31    fp = dlsym (p1, "foo");
      32    if (fp == NULL)
      33      {
      34        printf ("cannot get function \"foo\": %s\n", dlerror ());
      35        exit (EXIT_FAILURE);
      36      }
      37  
      38    result = fp ();
      39  
      40    if (dlclose (p1) != 0)
      41      {
      42        printf ("error while closing dblloadmod1.so: %s\n", dlerror ());
      43        exit (EXIT_FAILURE);
      44      }
      45  
      46    if (dlclose (p2) != 0)
      47      {
      48        printf ("error while closing dblloadmod2.so: %s\n", dlerror ());
      49        exit (EXIT_FAILURE);
      50      }
      51  
      52    return result;
      53  }