lib/libelf/elf_end.c

   1 /*-
   2  * Copyright (c) 2006,2008 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 #if 0
  30 #include <sys/mman.h>
  31 #endif
  32
  33 #include <assert.h>
  34 #include <libelf.h>
  35 #include <stdlib.h>
  36
  37 #include "_libelf.h"
  38
  39 LIBELF_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, tscn)
  72                                 scn = _libelf_release_scn(scn);
  73                         break;
  74                 case ELF_K_NUM:
  75                         assert(0);
  76                 default:
  77                         break;
  78                 }
  79
  80                 if (e->e_flags & LIBELF_F_MMAP)
  81                         (void) munmap(e->e_rawfile, e->e_rawsize);
  82
  83                 sv = e;
  84                 if ((e = e->e_parent) != NULL)
  85                         e->e_u.e_ar.e_nchildren--;
  86                 sv = _libelf_release_elf(sv);
  87         }
  88
  89         return (0);
  90 }