1  #include <unistd.h>
       2  
       3  /* Give init non-default priority so that it runs before init_array.  */
       4  static void init (void) __attribute__ ((constructor (1000)));
       5  
       6  static void
       7  init (void)
       8  {
       9    write (STDOUT_FILENO, "init\n", 5);
      10  }
      11  
      12  /* Give fini the same priority as init.  */
      13  static void fini (void) __attribute__ ((destructor (1000)));
      14  
      15  static void
      16  fini (void)
      17  {
      18    write (STDOUT_FILENO, "fini\n", 5);
      19  }
      20  
      21  static void
      22  preinit_0 (void)
      23  {
      24    write (STDOUT_FILENO, "preinit array 0\n", 16);
      25  }
      26  
      27  static void
      28  preinit_1 (void)
      29  {
      30    write (STDOUT_FILENO, "preinit array 1\n", 16);
      31  }
      32  
      33  static void
      34  preinit_2 (void)
      35  {
      36    write (STDOUT_FILENO, "preinit array 2\n", 16);
      37  }
      38  
      39  void (*const preinit_array []) (void)
      40       __attribute__ ((section (".preinit_array"), aligned (sizeof (void *)))) =
      41  {
      42    &preinit_0,
      43    &preinit_1,
      44    &preinit_2
      45  };
      46  
      47  static void
      48  init_0 (void)
      49  {
      50    write (STDOUT_FILENO, "init array 0\n", 13);
      51  }
      52  
      53  static void
      54  init_1 (void)
      55  {
      56    write (STDOUT_FILENO, "init array 1\n", 13);
      57  }
      58  
      59  static void
      60  init_2 (void)
      61  {
      62    write (STDOUT_FILENO, "init array 2\n", 13);
      63  }
      64  
      65  void (*init_array []) (void)
      66       __attribute__ ((section (".init_array"), aligned (sizeof (void *)))) =
      67  {
      68    &init_0,
      69    &init_1,
      70    &init_2
      71  };
      72  
      73  static void
      74  fini_0 (void)
      75  {
      76    write (STDOUT_FILENO, "fini array 0\n", 13);
      77  }
      78  
      79  static void
      80  fini_1 (void)
      81  {
      82    write (STDOUT_FILENO, "fini array 1\n", 13);
      83  }
      84  
      85  static void
      86  fini_2 (void)
      87  {
      88    write (STDOUT_FILENO, "fini array 2\n", 13);
      89  }
      90  
      91  void (*fini_array []) (void)
      92       __attribute__ ((section (".fini_array"), aligned (sizeof (void *)))) =
      93  {
      94    &fini_0,
      95    &fini_1,
      96    &fini_2
      97  };
      98  
      99  int
     100  main (void)
     101  {
     102    return 0;
     103  }