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/* Get loaded objects program headers.
Copyright (C) 2001-2025 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; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <ldsodefs.h>
#include <stddef.h>
#include <libc-lock.h>
static void
cancel_handler (void *arg __attribute__((unused)))
{
__rtld_lock_unlock_recursive (GL(dl_load_write_lock));
}
int
__dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info,
size_t size, void *data), void *data)
{
struct link_map *l;
struct dl_phdr_info info;
int ret = 0;
/* Make sure nobody modifies the list of loaded objects. */
__rtld_lock_lock_recursive (GL(dl_load_write_lock));
__libc_cleanup_push (cancel_handler, NULL);
/* We have to determine the namespace of the caller since this determines
which namespace is reported. */
size_t nloaded = GL(dl_ns)[0]._ns_nloaded;
Lmid_t ns = 0;
#ifdef SHARED
const void *caller = RETURN_ADDRESS (0);
for (Lmid_t cnt = GL(dl_nns) - 1; cnt > 0; --cnt)
for (struct link_map *l = GL(dl_ns)[cnt]._ns_loaded; l; l = l->l_next)
{
/* We have to count the total number of loaded objects. */
nloaded += GL(dl_ns)[cnt]._ns_nloaded;
if (caller >= (const void *) l->l_map_start
&& caller < (const void *) l->l_map_end
&& (l->l_contiguous
|| _dl_addr_inside_object (l, (ElfW(Addr)) caller)))
ns = cnt;
}
#endif
for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next)
{
info.dlpi_addr = l->l_real->l_addr;
info.dlpi_name = l->l_real->l_name;
info.dlpi_phdr = l->l_real->l_phdr;
info.dlpi_phnum = l->l_real->l_phnum;
info.dlpi_adds = GL(dl_load_adds);
info.dlpi_subs = GL(dl_load_adds) - nloaded;
info.dlpi_tls_data = NULL;
info.dlpi_tls_modid = l->l_real->l_tls_modid;
if (info.dlpi_tls_modid != 0)
info.dlpi_tls_data = GLRO(dl_tls_get_addr_soft) (l->l_real);
ret = callback (&info, sizeof (struct dl_phdr_info), data);
if (ret)
break;
}
/* Release the lock. */
__libc_cleanup_pop (0);
__rtld_lock_unlock_recursive (GL(dl_load_write_lock));
return ret;
}
hidden_def (__dl_iterate_phdr)
weak_alias (__dl_iterate_phdr, dl_iterate_phdr);
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