1/*-
2 * Copyright (c) 2006,2008-2009,2011 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 <assert.h>
28#include <libelf.h>
29#include <stdlib.h>
30
31#include "_libelf.h"
32
33#if	ELFTC_HAVE_MMAP
34#include <sys/mman.h>
35#endif
36
37ELFTC_VCSID("$Id: elf_end.c 3738 2019-05-05 21:49:06Z jkoshy $");
38
39int
40elf_end(Elf *e)
41{
42	Elf *sv;
43	Elf_Scn *scn, *tscn;
44
45	if (e == NULL || e->e_activations == 0)
46		return (0);
47
48	if (--e->e_activations > 0)
49		return (e->e_activations);
50
51	assert(e->e_activations == 0);
52
53	while (e && e->e_activations == 0) {
54		switch (e->e_kind) {
55		case ELF_K_AR:
56			/*
57			 * If we still have open child descriptors, we
58			 * need to defer reclaiming resources till all
59			 * the child descriptors for the archive are
60			 * closed.
61			 */
62			if (e->e_u.e_ar.e_nchildren > 0)
63				return (0);
64			break;
65		case ELF_K_ELF:
66			/*
67			 * Reclaim all section descriptors.
68			 */
69			RB_FOREACH_SAFE(scn, scntree, &e->e_u.e_elf.e_scn, tscn)
70 				scn = _libelf_release_scn(scn);
71			break;
72		case ELF_K_NUM:
73			assert(0);
74		default:
75			break;
76		}
77
78		if (e->e_rawfile) {
79			if (e->e_flags & LIBELF_F_RAWFILE_MALLOC)
80				free(e->e_rawfile);
81#if	ELFTC_HAVE_MMAP
82			else if (e->e_flags & LIBELF_F_RAWFILE_MMAP)
83				(void) munmap(e->e_rawfile, (size_t) e->e_rawsize);
84#endif
85		}
86
87		sv = e;
88		if ((e = e->e_parent) != NULL)
89			e->e_u.e_ar.e_nchildren--;
90		_libelf_release_elf(sv);
91	}
92
93	return (0);
94}
95