1 /*-
2 * Copyright (c) 2006 Joseph Koshy
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/mman.h>
31
32 #include <assert.h>
33 #include <libelf.h>
34 #include <stdlib.h>
35
36 #include "_libelf.h"
37
38 int
elf_end(Elf * e)39 elf_end(Elf *e)
40 {
41 Elf *sv;
42 Elf_Scn *scn, *tscn;
43
44 if (e == NULL || e->e_activations == 0)
45 return (0);
46
47 if (--e->e_activations > 0)
48 return (e->e_activations);
49
50 assert(e->e_activations == 0);
51
52 while (e && e->e_activations == 0) {
53 switch (e->e_kind) {
54 case ELF_K_AR:
55 /*
56 * If we still have open child descriptors, we
57 * need to defer reclaiming resources till all
58 * the child descriptors for the archive are
59 * closed.
60 */
61 if (e->e_u.e_ar.e_nchildren > 0)
62 return (0);
63 break;
64 case ELF_K_ELF:
65 /*
66 * Reclaim all section descriptors.
67 */
68 STAILQ_FOREACH_SAFE(scn, &e->e_u.e_elf.e_scn, s_next, tscn)
69 scn = _libelf_release_scn(scn);
70 break;
71 case ELF_K_NUM:
72 assert(0);
73 default:
74 break;
75 }
76
77 if (e->e_flags & LIBELF_F_MMAP)
78 (void) munmap(e->e_rawfile, e->e_rawsize);
79
80 sv = e;
81 if ((e = e->e_parent) != NULL)
82 e->e_u.e_ar.e_nchildren--;
83 sv = _libelf_release_elf(sv);
84 }
85
86 return (0);
87 }
88
89