code.delx.au - gnu-emacs/blob - test/etags/c-src/exit.c

   1 /* Copyright (C) 1991, 2016 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include "exit.h"
  24
  25 #ifdef  HAVE_GNU_LD
  26 CONST struct
  27   {
  28     size_t n;
  29     void EXFUN((*fn[1]), (NOARGS));
  30   } __libc_atexit;
  31 #endif
  32
  33 /* Call all functions registered with `atexit' and `on_exit',
  34    in the reverse of the order in which they were registered
  35    perform stdio cleanup, and terminate program execution with STATUS.  */
  36 __NORETURN
  37 void
  38 DEFUN(exit, (status), int status)
  39 {
  40   register CONST struct exit_function_list *l;
  41
  42   for (l = __exit_funcs; l != NULL; l = l->next)
  43     {
  44       register size_t i = l->idx;
  45       while (i-- > 0)
  46         {
  47           CONST struct exit_function *CONST f = &l->fns[i];
  48           switch (f->flavor)
  49             {
  50             case ef_free:
  51               break;
  52             case ef_on:
  53               (*f->func.on.fn)(status, f->func.on.arg);
  54               break;
  55             case ef_at:
  56               (*f->func.at)();
  57               break;
  58             }
  59         }
  60     }
  61
  62 #ifdef  HAVE_GNU_LD
  63   {
  64     void EXFUN((*CONST *fn), (NOARGS));
  65     for (fn = __libc_atexit.fn; *fn != NULL; ++fn)
  66       (**fn) ();
  67   }
  68 #else
  69   {
  70     extern void EXFUN(_cleanup, (NOARGS));
  71     _cleanup();
  72   }
  73 #endif
  74
  75   _exit(status);
  76 }
  77