github.com/afumu/libc@v0.0.6/musl/src/exit/exit.c (about)

     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  weak_alias(dummy, _fini);
    14  
    15  extern weak hidden void (*const __fini_array_start)(void), (*const __fini_array_end)(void);
    16  
    17  static void libc_exit_fini(void)
    18  {
    19  	uintptr_t a = (uintptr_t)&__fini_array_end;
    20  	for (; a>(uintptr_t)&__fini_array_start; a-=sizeof(void(*)()))
    21  		(*(void (**)())(a-sizeof(void(*)())))();
    22  	_fini();
    23  }
    24  
    25  weak_alias(libc_exit_fini, __libc_exit_fini);
    26  
    27  _Noreturn void exit(int code)
    28  {
    29  	__funcs_on_exit();
    30  	__libc_exit_fini();
    31  	__stdio_exit();
    32  	_Exit(code);
    33  }