lib/csu.i386/crt1.c

typedef void (*func_ptr) (void);

func_ptr __CTOR_LIST__[2];
func_ptr __DTOR_LIST__[2];

/* Run all the global destructors on exit from the program.  */

static void
__do_global_dtors ()
{
        unsigned nptrs = (unsigned long) __DTOR_LIST__[0];
        unsigned i;

  /* Some systems place the number of pointers
     in the first word of the table.
     On other systems, that word is -1.
     In all cases, the table is null-terminated.  */

  /* If the length is not recorded, count up to the null.  */
  if (nptrs == -1)
    for (nptrs = 0; __DTOR_LIST__[nptrs + 1] != 0; nptrs++);

  /* GNU LD format.  */
  for (i = nptrs; i >= 1; i--)
    __DTOR_LIST__[i] ();

}

static void
__do_global_ctors ()
{
        func_ptr *p;

        for (p = __CTOR_LIST__ + 1; *p; )
                (*p++)();
        atexit (__do_global_dtors);
}

__init()
{
        static int initialized = 0;
        if (! initialized) {
                initialized = 1;
                __do_global_ctors ();
        }

}