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
38int
39elf_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