1 /* Create clone of a given descriptor.
2 Copyright (C) 2003, 2004 Red Hat, Inc.
3 Written by Ulrich Drepper <drepper@redhat.com>, 2003.
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, version 2.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
17
18 #ifdef HAVE_CONFIG_H
19 # include <config.h>
20 #endif
21
22 #include <assert.h>
23 #include <stddef.h>
24 #include "libelfP.h"
25 #include "common.h"
26
27
28 Elf *
elf_clone(Elf * elf,Elf_Cmd cmd)29 elf_clone (Elf *elf, Elf_Cmd cmd)
30 {
31 Elf *retval = NULL;
32
33 if (elf == NULL)
34 /* Some earlier mistake. */
35 return NULL;
36
37 /* Make sure the descriptor is not suddenly going away. */
38 rwlock_rdlock (elf->lock);
39
40 if (cmd != ELF_C_EMPTY)
41 // XXX TODO handle ELF_C_READ/WRITE etc
42 goto out;
43
44 retval = allocate_elf (elf->fildes, elf->map_address, elf->start_offset,
45 elf->maximum_size, elf->cmd, elf->parent, elf->kind,
46 elf->state.elf32.scns.max * sizeof (Elf_Scn));
47 if (retval != NULL)
48 {
49 /* We have to write to the file in any case. */
50 retval->flags = ELF_F_DIRTY;
51
52 /* Some more or less arbitrary value. */
53 retval->state.elf.scnincr = 10;
54
55 /* We have allocated room for some sections. */
56 assert (offsetof (struct Elf, state.elf32.scns)
57 == offsetof (struct Elf, state.elf64.scns));
58 retval->state.elf.scns_last = &retval->state.elf32.scns;
59 retval->state.elf32.scns.max = elf->state.elf32.scns.max;
60
61 retval->class = elf->class;
62 }
63
64 /* Release the lock. */
65 out:
66 rwlock_unlock (elf->lock);
67
68 return retval;
69 }
70