Fix invalid file descriptor reuse while sending DNS query (BZ #15946)
[glibc.git] / elf / dl-iteratephdr.c
blob6572ec3a33dff5512a3b4913fc86c6e01efbfa98
1 /* Get loaded objects program headers.
2 Copyright (C) 2001-2014 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Jakub Jelinek <jakub@redhat.com>, 2001.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If
18 not, see <http://www.gnu.org/licenses/>. */
20 #include <errno.h>
21 #include <ldsodefs.h>
22 #include <stddef.h>
23 #include <bits/libc-lock.h>
25 static void
26 cancel_handler (void *arg __attribute__((unused)))
28 __rtld_lock_unlock_recursive (GL(dl_load_write_lock));
31 hidden_proto (__dl_iterate_phdr)
32 int
33 __dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info,
34 size_t size, void *data), void *data)
36 struct link_map *l;
37 struct dl_phdr_info info;
38 int ret = 0;
40 /* Make sure nobody modifies the list of loaded objects. */
41 __rtld_lock_lock_recursive (GL(dl_load_write_lock));
42 __libc_cleanup_push (cancel_handler, NULL);
44 /* We have to determine the namespace of the caller since this determines
45 which namespace is reported. */
46 size_t nloaded = GL(dl_ns)[0]._ns_nloaded;
47 Lmid_t ns = 0;
48 #ifdef SHARED
49 const void *caller = RETURN_ADDRESS (0);
50 for (Lmid_t cnt = GL(dl_nns) - 1; cnt > 0; --cnt)
51 for (struct link_map *l = GL(dl_ns)[cnt]._ns_loaded; l; l = l->l_next)
53 /* We have to count the total number of loaded objects. */
54 nloaded += GL(dl_ns)[cnt]._ns_nloaded;
56 if (caller >= (const void *) l->l_map_start
57 && caller < (const void *) l->l_map_end
58 && (l->l_contiguous
59 || _dl_addr_inside_object (l, (ElfW(Addr)) caller)))
60 ns = cnt;
62 #endif
64 for (l = GL(dl_ns)[ns]._ns_loaded; l != NULL; l = l->l_next)
66 info.dlpi_addr = l->l_real->l_addr;
67 info.dlpi_name = l->l_real->l_name;
68 info.dlpi_phdr = l->l_real->l_phdr;
69 info.dlpi_phnum = l->l_real->l_phnum;
70 info.dlpi_adds = GL(dl_load_adds);
71 info.dlpi_subs = GL(dl_load_adds) - nloaded;
72 info.dlpi_tls_data = NULL;
73 info.dlpi_tls_modid = l->l_real->l_tls_modid;
74 if (info.dlpi_tls_modid != 0)
75 info.dlpi_tls_data = GLRO(dl_tls_get_addr_soft) (l->l_real);
76 ret = callback (&info, sizeof (struct dl_phdr_info), data);
77 if (ret)
78 break;
81 /* Release the lock. */
82 __libc_cleanup_pop (0);
83 __rtld_lock_unlock_recursive (GL(dl_load_write_lock));
85 return ret;
87 hidden_def (__dl_iterate_phdr)
89 weak_alias (__dl_iterate_phdr, dl_iterate_phdr);