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/* Deallocating malloc'ed memory from the dynamic loader.
Copyright (C) 2021-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <ldsodefs.h>
#include <dl-find_object.h>
static bool
free_slotinfo (struct dtv_slotinfo_list **elemp)
{
size_t cnt;
if (*elemp == NULL)
/* Nothing here, all is removed (or there never was anything). */
return true;
if (!free_slotinfo (&(*elemp)->next))
/* We cannot free the entry. */
return false;
/* That cleared our next pointer for us. */
for (cnt = 0; cnt < (*elemp)->len; ++cnt)
if ((*elemp)->slotinfo[cnt].map != NULL)
/* Still used. */
return false;
/* We can remove the list element. */
free (*elemp);
*elemp = NULL;
return true;
}
void
__rtld_libc_freeres (void)
{
struct link_map *l;
struct r_search_path_elem *d;
/* Remove all search directories. */
d = GL(dl_all_dirs);
while (d != GLRO(dl_init_all_dirs))
{
struct r_search_path_elem *old = d;
d = d->next;
free (old);
}
for (Lmid_t ns = 0; ns < GL(dl_nns); ++ns)
{
for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next)
{
struct libname_list *lnp = l->l_libname->next;
l->l_libname->next = NULL;
/* Remove all additional names added to the objects. */
while (lnp != NULL)
{
struct libname_list *old = lnp;
lnp = lnp->next;
if (! old->dont_free)
free (old);
}
/* Free the initfini dependency list. */
if (l->l_free_initfini)
free (l->l_initfini);
l->l_initfini = NULL;
}
if (__builtin_expect (GL(dl_ns)[ns]._ns_global_scope_alloc, 0) != 0
&& (GL(dl_ns)[ns]._ns_main_searchlist->r_nlist
// XXX Check whether we need NS-specific initial_searchlist
== GLRO(dl_initial_searchlist).r_nlist))
{
/* All object dynamically loaded by the program are unloaded. Free
the memory allocated for the global scope variable. */
struct link_map **old = GL(dl_ns)[ns]._ns_main_searchlist->r_list;
/* Put the old map in. */
GL(dl_ns)[ns]._ns_main_searchlist->r_list
// XXX Check whether we need NS-specific initial_searchlist
= GLRO(dl_initial_searchlist).r_list;
/* Signal that the original map is used. */
GL(dl_ns)[ns]._ns_global_scope_alloc = 0;
/* Now free the old map. */
free (old);
}
}
/* Free the memory allocated for the dtv slotinfo array. We can do
this only if all modules which used this memory are unloaded. */
#ifdef SHARED
if (GL(dl_initial_dtv) == NULL)
/* There was no initial TLS setup, it was set up later when
it used the normal malloc. */
free_slotinfo (&GL(dl_tls_dtv_slotinfo_list));
else
#endif
/* The first element of the list does not have to be deallocated.
It was allocated in the dynamic linker (i.e., with a different
malloc), and in the static library it's in .bss space. */
free_slotinfo (&GL(dl_tls_dtv_slotinfo_list)->next);
void *scope_free_list = GL(dl_scope_free_list);
GL(dl_scope_free_list) = NULL;
free (scope_free_list);
_dl_find_object_freeres ();
}
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