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
28#include <sys/mman.h>
29
30#include <assert.h>
31#include "libelf.h"
32#include <stdlib.h>
33
34#include "_libelf.h"
35
36int
37elf_end(Elf *e)
38{
39        Elf *sv;
40        Elf_Scn *scn, *tscn;
41
42        if (e == NULL || e->e_activations == 0)
43                return (0);
44
45        if (--e->e_activations > 0)
46                return (e->e_activations);
47
48        assert(e->e_activations == 0);
49
50        while (e && e->e_activations == 0) {
51                switch (e->e_kind) {
52                case ELF_K_AR:
53                        /*
54                         * If we still have open child descriptors, we
55                         * need to defer reclaiming resources till all
56                         * the child descriptors for the archive are
57                         * closed.
58                         */
59                        if (e->e_u.e_ar.e_nchildren > 0)
60                                return (0);
61                        break;
62                case ELF_K_ELF:
63                        /*
64                         * Reclaim all section descriptors.
65                         */
66                        STAILQ_FOREACH_SAFE(scn, &e->e_u.e_elf.e_scn, s_next, tscn)
67                                scn = _libelf_release_scn(scn);
68                        break;
69                case ELF_K_NUM:
70                        assert(0);
71                default:
72                        break;
73                }
74
75                if (e->e_flags & LIBELF_F_MMAP)
76                        (void) munmap(e->e_rawfile, e->e_rawsize);
77
78                sv = e;
79                if ((e = e->e_parent) != NULL)
80                        e->e_u.e_ar.e_nchildren--;
81                sv = _libelf_release_elf(sv);
82        }
83
84        return (0);
85}
86
87