1/* Copyright (C) 1997-2022 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 <https://www.gnu.org/licenses/>. */
17
18#include <atomic.h>
19#include <stdlib.h>
20#include <set-hooks.h>
21#include <libc-internal.h>
22#include <unwind-link.h>
23#include <dlfcn/dlerror.h>
24#include <ldsodefs.h>
25
26#include "../nss/nsswitch.h"
27#include "../libio/libioP.h"
28
29DEFINE_HOOK (__libc_subfreeres, (void));
30
31symbol_set_define (__libc_freeres_ptrs);
32
33extern void __libpthread_freeres (void)
34#if PTHREAD_IN_LIBC && defined SHARED
35/* It is possible to call __libpthread_freeres directly in shared
36 builds with an integrated libpthread. */
37 attribute_hidden
38#else
39 __attribute__ ((weak))
40#endif
41 ;
42
43void __libc_freeres_fn_section
44__libc_freeres (void)
45{
46 /* This function might be called from different places. So better
47 protect for multiple executions since these are fatal. */
48 static long int already_called;
49
50 if (!atomic_compare_and_exchange_bool_acq (&already_called, 1, 0))
51 {
52 void *const *p;
53
54 call_function_static_weak (__nss_module_freeres);
55 call_function_static_weak (__nss_action_freeres);
56 call_function_static_weak (__nss_database_freeres);
57
58 _IO_cleanup ();
59
60 /* We run the resource freeing after IO cleanup. */
61 RUN_HOOK (__libc_subfreeres, ());
62
63 call_function_static_weak (__libpthread_freeres);
64
65#ifdef SHARED
66 __libc_unwind_link_freeres ();
67#endif
68
69 call_function_static_weak (__libc_dlerror_result_free);
70
71#ifdef SHARED
72 GLRO (dl_libc_freeres) ();
73#endif
74
75 for (p = symbol_set_first_element (__libc_freeres_ptrs);
76 !symbol_set_end_p (__libc_freeres_ptrs, p); ++p)
77 free (*p);
78 }
79}
80libc_hidden_def (__libc_freeres)
81

source code of glibc/malloc/set-freeres.c