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      1 /* Copyright (C) 1999-2022 Free Software Foundation, Inc.
      2 
      3    NOTE: This source is derived from an old version taken from the GNU C
      4    Library (glibc).
      5 
      6 This file is part of GCC.
      7 
      8 GCC is free software; you can redistribute it and/or modify it under
      9 the terms of the GNU General Public License as published by the Free
     10 Software Foundation; either version 3, or (at your option) any later
     11 version.
     12 
     13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
     14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
     15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     16 for more details.
     17 
     18 Under Section 7 of GPL version 3, you are granted additional
     19 permissions described in the GCC Runtime Library Exception, version
     20 3.1, as published by the Free Software Foundation.
     21 
     22 You should have received a copy of the GNU General Public License and
     23 a copy of the GCC Runtime Library Exception along with this program;
     24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     25 <http://www.gnu.org/licenses/>.  */
     26 
     27 #include <stdlib.h>
     28 #include "exit.h"
     29 
     30 #define atomic_write_barrier() __asm__ ("eieio" ::: "memory")
     31 
     32 /* Register a function to be called by exit.  */
     33 int
     34 on_exit (void (*func) (int status, void *arg), void *arg)
     35 {
     36   struct exit_function *new = __new_exitfn (&__exit_funcs);
     37 
     38   if (new == NULL)
     39     return -1;
     40 
     41 #ifdef PTR_MANGLE
     42   PTR_MANGLE (func);
     43 #endif
     44   new->func.on.fn = func;
     45   new->func.on.arg = arg;
     46   atomic_write_barrier ();
     47   new->flavor = ef_on;
     48   return 0;
     49 }
     50