mirror of
git://sourceware.org/git/glibc.git
synced 2025-02-23 13:09:58 +08:00
d12cb8e452
The functions serve very similar purposes. The advantage of __rtld_libc_freeres is that it is located within ld.so, so it is more natural to poke at link map internals there. This slightly regresses cleanup capabilities for statically linked binaries. If that becomes a problem, we should start calling __rtld_libc_freeres from __libc_freeres (perhaps after renaming it).
128 lines
3.7 KiB
C
128 lines
3.7 KiB
C
/* 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 ();
|
|
}
|