src/exit/exit.c

   1 #include <stdlib.h>
   2 #include <stdint.h>
   3 #include "libc.h"
   4
   5 static void dummy()
   6 {
   7 }
   8
   9 /* atexit.c and __stdio_exit.c override these. the latter is linked
  10  * as a consequence of linking either __toread.c or __towrite.c. */
  11 weak_alias(dummy, __funcs_on_exit);
  12 weak_alias(dummy, __stdio_exit);
  13
  14 extern void _fini() __attribute__((weak));
  15 extern void (*const __fini_array_start)() __attribute__((weak));
  16 extern void (*const __fini_array_end)() __attribute__((weak));
  17
  18 static void libc_exit_fini(void)
  19 {
  20         uintptr_t a = (uintptr_t)&__fini_array_end;
  21         for (; a>(uintptr_t)&__fini_array_start; a-=sizeof(void(*)()))
  22                 (*(void (**)())(a-sizeof(void(*)())))();
  23         if (_fini) _fini();
  24 }
  25
  26 weak_alias(libc_exit_fini, __libc_exit_fini);
  27
  28 _Noreturn void exit(int code)
  29 {
  30         __funcs_on_exit();
  31         __libc_exit_fini();
  32         __stdio_exit();
  33         _Exit(code);
  34 }