1 /* $NetBSD: elf_end.c,v 1.2 2014/03/09 16:58:04 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2006,2008-2009,2011 Joseph Koshy
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #if HAVE_NBTOOL_CONFIG_H
30 # include "nbtool_config.h"
31 #endif
32
33 #include <sys/cdefs.h>
34
35 #include <assert.h>
36 #include <libelf.h>
37 #include <stdlib.h>
38
39 #include "_libelf.h"
40
41 #if ELFTC_HAVE_MMAP
42 #include <sys/mman.h>
43 #endif
44
45 __RCSID("$NetBSD: elf_end.c,v 1.2 2014/03/09 16:58:04 christos Exp $");
46 ELFTC_VCSID("Id: elf_end.c 2240 2011-11-28 06:36:48Z jkoshy ");
47
48 int
elf_end(Elf * e)49 elf_end(Elf *e)
50 {
51 Elf *sv;
52 Elf_Scn *scn, *tscn;
53
54 if (e == NULL || e->e_activations == 0)
55 return (0);
56
57 if (--e->e_activations > 0)
58 return (e->e_activations);
59
60 assert(e->e_activations == 0);
61
62 while (e && e->e_activations == 0) {
63 switch (e->e_kind) {
64 case ELF_K_AR:
65 /*
66 * If we still have open child descriptors, we
67 * need to defer reclaiming resources till all
68 * the child descriptors for the archive are
69 * closed.
70 */
71 if (e->e_u.e_ar.e_nchildren > 0)
72 return (0);
73 break;
74 case ELF_K_ELF:
75 /*
76 * Reclaim all section descriptors.
77 */
78 STAILQ_FOREACH_SAFE(scn, &e->e_u.e_elf.e_scn, s_next,
79 tscn)
80 scn = _libelf_release_scn(scn);
81 break;
82 case ELF_K_NUM:
83 assert(0);
84 default:
85 break;
86 }
87
88 if (e->e_rawfile) {
89 if (e->e_flags & LIBELF_F_RAWFILE_MALLOC)
90 free(e->e_rawfile);
91 #if ELFTC_HAVE_MMAP
92 else if (e->e_flags & LIBELF_F_RAWFILE_MMAP)
93 (void) munmap(e->e_rawfile, e->e_rawsize);
94 #endif
95 }
96
97 sv = e;
98 if ((e = e->e_parent) != NULL)
99 e->e_u.e_ar.e_nchildren--;
100 sv = _libelf_release_elf(sv);
101 }
102
103 return (0);
104 }
105