malloc/set-freeres.c

   1 /* Copyright (C) 1997-2017 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <atomic.h>
  19 #include <stdlib.h>
  20 #include <set-hooks.h>
  21 #include <libc-internal.h>
  22
  23 #include "../libio/libioP.h"
  24
  25 DEFINE_HOOK (__libc_subfreeres, (void));
  26
  27 symbol_set_define (__libc_freeres_ptrs);
  28
  29 void __libc_freeres_fn_section
  30 __libc_freeres (void)
  31 {
  32   /* This function might be called from different places.  So better
  33      protect for multiple executions since these are fatal.  */
  34   static long int already_called;
  35
  36   if (!atomic_compare_and_exchange_bool_acq (&already_called, 1, 0))
  37     {
  38       void *const *p;
  39
  40       _IO_cleanup ();
  41
  42       RUN_HOOK (__libc_subfreeres, ());
  43
  44       for (p = symbol_set_first_element (__libc_freeres_ptrs);
  45            !symbol_set_end_p (__libc_freeres_ptrs, p); ++p)
  46         free (*p);
  47     }
  48 }
  49 libc_hidden_def (__libc_freeres)