gelf_getsyminfo.c revision de2ed97f33139af5c7a0811e4ec66fc896a13cf2 
1/* Get additional symbol information from symbol table at the given index.
2   Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
3   This file is part of elfutils.
4   Written by Ulrich Drepper <drepper@redhat.com>, 2000.
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 <gelf.h>
36#include <string.h>
37
38#include "libelfP.h"
39
40
41GElf_Syminfo *
42gelf_getsyminfo (data, ndx, dst)
43     Elf_Data *data;
44     int ndx;
45     GElf_Syminfo *dst;
46{
47  GElf_Syminfo *result = NULL;
48
49  if (data == NULL)
50    return NULL;
51
52  if (unlikely (data->d_type != ELF_T_SYMINFO))
53    {
54      __libelf_seterrno (ELF_E_INVALID_HANDLE);
55      return NULL;
56    }
57
58  /* The types for 32 and 64 bit are the same.  Lucky us.  */
59  assert (sizeof (GElf_Syminfo) == sizeof (Elf32_Syminfo));
60  assert (sizeof (GElf_Syminfo) == sizeof (Elf64_Syminfo));
61
62  rwlock_rdlock (((Elf_Data_Scn *) data)->s->elf->lock);
63
64  /* The data is already in the correct form.  Just make sure the
65     index is OK.  */
66  if (unlikely ((ndx + 1) * sizeof (GElf_Syminfo) > data->d_size))
67    {
68      __libelf_seterrno (ELF_E_INVALID_INDEX);
69      goto out;
70    }
71
72  *dst = ((GElf_Syminfo *) data->d_buf)[ndx];
73
74  result = dst;
75
76 out:
77  rwlock_unlock (((Elf_Data_Scn *) data)->s->elf->lock);
78
79  return result;
80}
81