Line data Source code
1 : /* Read header of next archive member.
2 : Copyright (C) 1998, 1999, 2000, 2002, 2008, 2015 Red Hat, Inc.
3 : This file is part of elfutils.
4 : Written by Ulrich Drepper <drepper@redhat.com>, 1998.
5 :
6 : This file is free software; you can redistribute it and/or modify
7 : it under the terms of either
8 :
9 : * the GNU Lesser General Public License as published by the Free
10 : Software Foundation; either version 3 of the License, or (at
11 : your option) any later version
12 :
13 : or
14 :
15 : * the GNU General Public License as published by the Free
16 : Software Foundation; either version 2 of the License, or (at
17 : your option) any later version
18 :
19 : or both in parallel, as here.
20 :
21 : elfutils is distributed in the hope that it will be useful, but
22 : WITHOUT ANY WARRANTY; without even the implied warranty of
23 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 : General Public License for more details.
25 :
26 : You should have received copies of the GNU General Public License and
27 : the GNU Lesser General Public License along with this program. If
28 : not, see <http://www.gnu.org/licenses/>. */
29 :
30 : #ifdef HAVE_CONFIG_H
31 : # include <config.h>
32 : #endif
33 :
34 : #include <assert.h>
35 : #include <libelf.h>
36 : #include <stddef.h>
37 :
38 : #include "libelfP.h"
39 :
40 :
41 : Elf_Arhdr *
42 7231 : elf_getarhdr (Elf *elf)
43 : {
44 7231 : if (elf == NULL)
45 : return NULL;
46 :
47 7231 : Elf *parent = elf->parent;
48 :
49 : /* Calling this function is not ok for any file type but archives. */
50 7231 : if (parent == NULL)
51 : {
52 0 : __libelf_seterrno (ELF_E_INVALID_OP);
53 0 : return NULL;
54 : }
55 :
56 : /* Make sure we have read the archive header. */
57 7231 : if (parent->state.ar.elf_ar_hdr.ar_name == NULL
58 0 : && __libelf_next_arhdr_wrlock (parent) != 0)
59 : {
60 : rwlock_wrlock (parent->lock);
61 0 : int st = __libelf_next_arhdr_wrlock (parent);
62 : rwlock_unlock (parent->lock);
63 :
64 0 : if (st != 0)
65 : /* Something went wrong. Maybe there is no member left. */
66 : return NULL;
67 : }
68 :
69 : /* We can be sure the parent is an archive. */
70 7231 : assert (parent->kind == ELF_K_AR);
71 :
72 7231 : return &parent->state.ar.elf_ar_hdr;
73 : }
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