source: azure_iot_hub/trunk/musl-1.1.18/src/exit/exit.c@ 390

#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);
}