external/bsd/elftoolchain/dist/libelf/elf_end.c

   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
  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 }