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 <sys/cdefs.h>
28  
29  #include <assert.h>
30  #include <libelf.h>
31  #include <stdlib.h>
32  
33  #include "_libelf.h"
34  
35  #if	ELFTC_HAVE_MMAP
36  #include <sys/mman.h>
37  #endif
38  
39  ELFTC_VCSID("$Id$");
40  
41  int
42  elf_end(Elf *e)
43  {
44  	Elf *sv;
45  	Elf_Scn *scn, *tscn;
46  
47  	if (e == NULL || e->e_activations == 0)
48  		return (0);
49  
50  	if (--e->e_activations > 0)
51  		return (e->e_activations);
52  
53  	assert(e->e_activations == 0);
54  
55  	while (e && e->e_activations == 0) {
56  		switch (e->e_kind) {
57  		case ELF_K_AR:
58  			/*
59  			 * If we still have open child descriptors, we
60  			 * need to defer reclaiming resources till all
61  			 * the child descriptors for the archive are
62  			 * closed.
63  			 */
64  			if (e->e_u.e_ar.e_nchildren > 0)
65  				return (0);
66  			break;
67  		case ELF_K_ELF:
68  			/*
69  			 * Reclaim all section descriptors.
70  			 */
71  			STAILQ_FOREACH_SAFE(scn, &e->e_u.e_elf.e_scn, s_next,
72  			    tscn)
73   				scn = _libelf_release_scn(scn);
74  			break;
75  		case ELF_K_NUM:
76  			assert(0);
77  		default:
78  			break;
79  		}
80  
81  		if (e->e_rawfile) {
82  			if (e->e_flags & LIBELF_F_RAWFILE_MALLOC)
83  				free(e->e_rawfile);
84  #if	ELFTC_HAVE_MMAP
85  			else if (e->e_flags & LIBELF_F_RAWFILE_MMAP)
86  				(void) munmap(e->e_rawfile, e->e_rawsize);
87  #endif
88  		}
89  
90  		sv = e;
91  		if ((e = e->e_parent) != NULL)
92  			e->e_u.e_ar.e_nchildren--;
93  		sv = _libelf_release_elf(sv);
94  	}
95  
96  	return (0);
97  }