elf/soinit.c

   1 /* Initializer module for building the ELF shared C library.  This file and
   2    sofini.c do the work normally done by crtbeginS.o and crtendS.o, to wrap
   3    the `.ctors' and `.dtors' sections so the lists are terminated, and
   4    calling those lists of functions.  */
   5
   6 #ifndef NO_CTORS_DTORS_SECTIONS
   7 # include <libc-internal.h>
   8 # include <stdlib.h>
   9
  10 static void (*const __CTOR_LIST__[1]) (void)
  11   __attribute__ ((used, section (".ctors")))
  12   = { (void (*) (void)) -1 };
  13 static void (*const __DTOR_LIST__[1]) (void)
  14   __attribute__ ((used, section (".dtors")))
  15   = { (void (*) (void)) -1 };
  16
  17 static inline void
  18 run_hooks (void (*const list[]) (void))
  19 {
  20   while (*++list)
  21     (**list) ();
  22 }
  23
  24 /* This function will be called from _init in init-first.c.  */
  25 void
  26 __libc_global_ctors (void)
  27 {
  28   /* Call constructor functions.  */
  29   run_hooks (__CTOR_LIST__);
  30 }
  31
  32
  33 /* This function becomes the DT_FINI termination function
  34    for the C library.  */
  35 void
  36 __libc_fini (void)
  37 {
  38   /* Call destructor functions.  */
  39   run_hooks (__DTOR_LIST__);
  40 }
  41
  42 void (*_fini_ptr) (void) __attribute__ ((section (".fini_array")))
  43      = &__libc_fini;
  44 #endif