1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 #include <string.h>
27 #include <gelf.h>
28 #include <decl.h>
29 #include <msg.h>
30
31
32 /*
33 * Return number of entries in the section header array, taking
34 * extended headers into account.
35 *
36 * elf_getshnum() and elf_getshstrndx() were defined during the 2002 gABI
37 * meetings. They were supposed to return -1 for failure, and 0 for success.
38 * Our manpage documented them as such, but we then implemented them to
39 * return 0 for failure and 1 for success. This makes elf_getshnum() and
40 * elf_getshstrnum() non-portable to systems that implement the 2002 gABI
41 * definition.
42 *
43 * In 2005, the manpage was modified to match the code.
44 * In 2009, the discrepency was identified. elf_getshdrnum() and
45 * elf_getshdrstrndx() were created to provide a portable implementation.
46 * The older two functions are considered to be obsolete, and are retained
47 * for backward compatability.
48 */
49
50 int
elf_getshdrnum(Elf * elf,size_t * shnum)51 elf_getshdrnum(Elf *elf, size_t *shnum)
52 {
53 GElf_Ehdr ehdr;
54 Elf_Scn *scn;
55 GElf_Shdr shdr0;
56
57 if (gelf_getehdr(elf, &ehdr) == 0)
58 return (-1);
59 if (ehdr.e_shnum > 0) {
60 *shnum = ehdr.e_shnum;
61 return (0);
62 }
63 if ((ehdr.e_shnum == 0) && (ehdr.e_shoff == 0)) {
64 *shnum = 0;
65 return (0);
66 }
67 if ((scn = elf_getscn(elf, 0)) == 0)
68 return (-1);
69 if (gelf_getshdr(scn, &shdr0) == 0)
70 return (-1);
71 *shnum = shdr0.sh_size;
72 return (0);
73 }
74
75 int
elf_getshnum(Elf * elf,size_t * shnum)76 elf_getshnum(Elf *elf, size_t *shnum)
77 {
78 return (elf_getshdrnum(elf, shnum) == 0);
79 }
80