elf/tst-audit2.c

   1 /* Test case for early TLS initialization in dynamic linker.  */
   2
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <dlfcn.h>
   7
   8 #define MAGIC1 0xabcdef72
   9 #define MAGIC2 0xd8675309
  10 static __thread unsigned int magic[] = { MAGIC1, MAGIC2 };
  11 static __thread int calloc_called;
  12
  13 #undef calloc
  14
  15 /* This calloc definition will be called by the dynamic linker itself.
  16    We test that interposed calloc is called by the dynamic loader, and
  17    that TLS is fully initialized by then.  */
  18
  19 void *
  20 calloc (size_t n, size_t m)
  21 {
  22   if (!calloc_called)
  23     {
  24       /* Allow our calloc to be called more than once.  */
  25       calloc_called = 1;
  26       if (magic[0] != MAGIC1 || magic[1] != MAGIC2)
  27         {
  28           printf ("{%x, %x} != {%x, %x}\n",
  29                   magic[0], magic[1], MAGIC1, MAGIC2);
  30           abort ();
  31         }
  32       magic[0] = MAGIC2;
  33       magic[1] = MAGIC1;
  34     }
  35
  36   n *= m;
  37   void *ptr = malloc (n);
  38   if (ptr != NULL)
  39     memset (ptr, '\0', n);
  40   return ptr;
  41 }
  42
  43 static int
  44 do_test (void)
  45 {
  46   /* Make sure that our calloc is called from the dynamic linker at least
  47      once.  */
  48   void *h = dlopen("$ORIGIN/tst-auditmod9b.so", RTLD_LAZY);
  49   if (h != NULL)
  50     dlclose (h);
  51   if (magic[1] != MAGIC1 || magic[0] != MAGIC2)
  52     {
  53       printf ("{%x, %x} != {%x, %x}\n", magic[0], magic[1], MAGIC2, MAGIC1);
  54       return 1;
  55     }
  56
  57   return 0;
  58 }
  59
  60 #include <support/test-driver.c>