ext/libelf/elf_end.c

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