external/bsd/libelf/dist/elf_end.c

   1 /*      $NetBSD$        */
   2
   3 /*-
   4  * Copyright (c) 2006 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 #include <sys/cdefs.h>
  30 /* __FBSDID("$FreeBSD: src/lib/libelf/elf_end.c,v 1.1.10.1.2.1 2009/10/25 01:10:29 kensmith Exp $"); */
  31
  32 #include <sys/mman.h>
  33
  34 #include <assert.h>
  35 #include <libelf.h>
  36 #include <stdlib.h>
  37
  38 #include "_libelf.h"
  39
  40 int
  41 elf_end(Elf *e)
  42 {
  43         Elf *sv;
  44         Elf_Scn *scn, *tscn;
  45
  46         if (e == NULL || e->e_activations == 0)
  47                 return (0);
  48
  49         if (--e->e_activations > 0)
  50                 return (e->e_activations);
  51
  52         assert(e->e_activations == 0);
  53
  54         while (e && e->e_activations == 0) {
  55                 switch (e->e_kind) {
  56                 case ELF_K_AR:
  57                         /*
  58                          * If we still have open child descriptors, we
  59                          * need to defer reclaiming resources till all
  60                          * the child descriptors for the archive are
  61                          * closed.
  62                          */
  63                         if (e->e_u.e_ar.e_nchildren > 0)
  64                                 return (0);
  65                         break;
  66                 case ELF_K_ELF:
  67                         /*
  68                          * Reclaim all section descriptors.
  69                          */
  70                         STAILQ_FOREACH_SAFE(scn, &e->e_u.e_elf.e_scn, s_next, tscn)
  71                                 scn = _libelf_release_scn(scn);
  72                         break;
  73                 case ELF_K_NUM:
  74                         assert(0);
  75                 default:
  76                         break;
  77                 }
  78
  79                 if (e->e_flags & LIBELF_F_MMAP)
  80                         (void) munmap(e->e_rawfile, e->e_rawsize);
  81
  82                 sv = e;
  83                 if ((e = e->e_parent) != NULL)
  84                         e->e_u.e_ar.e_nchildren--;
  85                 sv = _libelf_release_elf(sv);
  86         }
  87
  88         return (0);
  89 }
  90