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glibc  2.9
set-freeres.c
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00001 /* Copyright (C) 1997,1999,2000,2001,2002,2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <atomic.h>
00020 #include <stdlib.h>
00021 #include <set-hooks.h>
00022 #include <libc-internal.h>
00023 
00024 #ifdef USE_IN_LIBIO
00025 # include "../libio/libioP.h"
00026 #endif
00027 
00028 DEFINE_HOOK (__libc_subfreeres, (void));
00029 
00030 symbol_set_define (__libc_freeres_ptrs);
00031 
00032 void __libc_freeres_fn_section
00033 __libc_freeres (void)
00034 {
00035   /* This function might be called from different places.  So better
00036      protect for multiple executions since these are fatal.  */
00037   static long int already_called;
00038 
00039   if (! atomic_compare_and_exchange_bool_acq (&already_called, 1, 0))
00040     {
00041       void * const *p;
00042 
00043 #ifdef USE_IN_LIBIO
00044       _IO_cleanup ();
00045 #endif
00046 
00047       RUN_HOOK (__libc_subfreeres, ());
00048 
00049       for (p = symbol_set_first_element (__libc_freeres_ptrs);
00050           ! symbol_set_end_p (__libc_freeres_ptrs, p); ++p)
00051        free (*p);
00052     }
00053 }
00054 libc_hidden_def (__libc_freeres)