1  #include <dlfcn.h>
       2  #include <stdio.h>
       3  #include <gnu/lib-names.h>
       4  
       5  
       6  static int cnt;
       7  
       8  static void
       9  __attribute ((constructor))
      10  constr (void)
      11  {
      12    ++cnt;
      13  }
      14  
      15  
      16  int
      17  foo (Lmid_t ns2)
      18  {
      19    void *h = dlopen (LIBC_SO, RTLD_LAZY|RTLD_NOLOAD);
      20    if (h == NULL)
      21      {
      22        printf ("cannot get handle for %s: %s\n", LIBC_SO, dlerror ());
      23        return 1;
      24      }
      25  
      26    Lmid_t ns = -10;
      27    if (dlinfo (h, RTLD_DI_LMID, &ns) != 0)
      28      {
      29        printf ("dlinfo for %s in %s failed: %s\n",
      30  	      LIBC_SO, __func__, dlerror ());
      31        return 1;
      32      }
      33  
      34    if (ns != ns2)
      35      {
      36        printf ("namespace for %s not LM_ID_BASE\n", LIBC_SO);
      37        return 1;
      38      }
      39  
      40    if (dlclose (h) != 0)
      41      {
      42        printf ("dlclose for %s in %s failed: %s\n",
      43  	      LIBC_SO, __func__, dlerror ());
      44        return 1;
      45      }
      46  
      47    if (cnt == 0)
      48      {
      49        puts ("constructor did not run");
      50        return 1;
      51      }
      52    else if (cnt != 1)
      53      {
      54        puts ("constructor did not run exactly once");
      55        return 1;
      56      }
      57  
      58    return 0;
      59  }