fusl/src/exit/exit.c

#include <stdlib.h>
#include <stdint.h>
#include "libc.h"

static void dummy() {}

/* atexit.c and __stdio_exit.c override these. the latter is linked
 * as a consequence of linking either __toread.c or __towrite.c. */
weak_alias(dummy, __funcs_on_exit);
weak_alias(dummy, __stdio_exit);
weak_alias(dummy, _fini);

__attribute__((__weak__, __visibility__("hidden"))) extern void (
    *const __fini_array_start)(void),
    (*const __fini_array_end)(void);

static void libc_exit_fini(void) {
  uintptr_t a = (uintptr_t)&__fini_array_end;
  for (; a > (uintptr_t)&__fini_array_start; a -= sizeof(void (*)()))
    (*(void (**)())(a - sizeof(void (*)())))();
  _fini();
}

weak_alias(libc_exit_fini, __libc_exit_fini);

_Noreturn void exit(int code) {
  __funcs_on_exit();
  __libc_exit_fini();
  __stdio_exit();
  _Exit(code);
}