1 /* Creates an ELF handle from a possibly compressed file descriptor.
2 Copyright (C) 2018 Red Hat, Inc.
3 This file is part of elfutils.
4
5 This file is free software; you can redistribute it and/or modify
6 it under the terms of either
7
8 * the GNU Lesser General Public License as published by the Free
9 Software Foundation; either version 3 of the License, or (at
10 your option) any later version
11
12 or
13
14 * the GNU General Public License as published by the Free
15 Software Foundation; either version 2 of the License, or (at
16 your option) any later version
17
18 or both in parallel, as here.
19
20 elfutils is distributed in the hope that it will be useful, but
21 WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 General Public License for more details.
24
25 You should have received copies of the GNU General Public License and
26 the GNU Lesser General Public License along with this program. If
27 not, see <http://www.gnu.org/licenses/>. */
28
29 #ifdef HAVE_CONFIG_H
30 # include <config.h>
31 #endif
32
33 #include "libdwelfP.h"
34 #include "libdwflP.h"
35 #include "libelfP.h"
36
37 #include <unistd.h>
38
39 Elf *
dwelf_elf_begin(int fd)40 dwelf_elf_begin (int fd)
41 {
42 Elf *elf = NULL;
43 Dwfl_Error e = __libdw_open_elf (fd, &elf);
44 if (e == DWFL_E_NOERROR)
45 return elf;
46
47 /* Elf wasn't usable. Make sure there is a proper elf error
48 message. This is probably not the real error, because there is
49 no good way to propagate errnos or decompression errors, but
50 better than nothing. */
51
52 if (e != DWFL_E_LIBELF)
53 {
54 /* Force a bad ELF error. */
55 char badelf[EI_NIDENT] = { };
56 Elf *belf = elf_memory (badelf, EI_NIDENT);
57 elf32_getehdr (belf);
58 elf_end (belf);
59 }
60
61 return NULL;
62 }
63 OLD_VERSION (dwelf_elf_begin, ELFUTILS_0.175)
64 NEW_VERSION (dwelf_elf_begin, ELFUTILS_0.177)
65