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glibc/elf/dl-iteratephdr.c
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/* Get loaded objects program headers. | |
Copyright (C) 2001,2002,2003,2004,2006 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Jakub Jelinek <jakub@redhat.com>, 2001. | |
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, | |
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
Boston, MA 02111-1307, USA. */ | |
#include <errno.h> | |
#include <ldsodefs.h> | |
#include <stddef.h> | |
#include <bits/libc-lock.h> | |
static void | |
cancel_handler (void *arg __attribute__((unused))) | |
{ | |
__rtld_lock_unlock_recursive (GL(dl_load_lock)); | |
} | |
hidden_proto (__dl_iterate_phdr) | |
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 we are alone. */ | |
__rtld_lock_lock_recursive (GL(dl_load_lock)); | |
__libc_cleanup_push (cancel_handler, 0); | |
/* We have to determine the namespace of the caller since this determines | |
which namespace is reported. */ | |
const void *caller = RETURN_ADDRESS (0); | |
size_t nloaded = GL(dl_ns)[0]._ns_nloaded; | |
Lmid_t ns = 0; | |
for (Lmid_t cnt = 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) | |
/* There must be exactly one DSO for the range of the virtual | |
memory. Otherwise something is really broken. */ | |
ns = cnt; | |
} | |
for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next) | |
{ | |
info.dlpi_addr = l->l_addr; | |
info.dlpi_name = l->l_name; | |
info.dlpi_phdr = l->l_phdr; | |
info.dlpi_phnum = l->l_phnum; | |
info.dlpi_adds = GL(dl_load_adds); | |
info.dlpi_subs = GL(dl_load_adds) - nloaded; | |
info.dlpi_tls_modid = 0; | |
info.dlpi_tls_data = NULL; | |
#ifdef USE_TLS | |
info.dlpi_tls_modid = l->l_tls_modid; | |
if (info.dlpi_tls_modid != 0) | |
info.dlpi_tls_data = _dl_tls_get_addr_soft (l); | |
#endif | |
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_lock)); | |
return ret; | |
} | |
hidden_def (__dl_iterate_phdr) | |
#ifdef SHARED | |
weak_alias (__dl_iterate_phdr, dl_iterate_phdr); | |
#else | |
/* dl-support.c defines these and initializes them early on. */ | |
extern ElfW(Phdr) *_dl_phdr; | |
extern size_t _dl_phnum; | |
int | |
dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info, | |
size_t size, void *data), void *data) | |
{ | |
if (_dl_phnum != 0) | |
{ | |
/* This entry describes this statically-linked program itself. */ | |
struct dl_phdr_info info; | |
int ret; | |
info.dlpi_addr = 0; | |
info.dlpi_name = ""; | |
info.dlpi_phdr = _dl_phdr; | |
info.dlpi_phnum = _dl_phnum; | |
info.dlpi_adds = GL(dl_load_adds); | |
info.dlpi_subs = GL(dl_load_adds) - GL(dl_ns)[LM_ID_BASE]._ns_nloaded; | |
ret = (*callback) (&info, sizeof (struct dl_phdr_info), data); | |
if (ret) | |
return ret; | |
} | |
return __dl_iterate_phdr (callback, data); | |
} | |
#endif |