/*      $NetBSD: elf_end.c,v 1.5 2024/03/03 17:37:33 christos Exp $     */

/*-
* Copyright (c) 2006,2008-2009,2011 Joseph Koshy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#if HAVE_NBTOOL_CONFIG_H
# include "nbtool_config.h"
#endif

#include <sys/cdefs.h>

#include <assert.h>
#include <libelf.h>
#include <stdlib.h>

#include "_libelf.h"

#if     ELFTC_HAVE_MMAP
#include <sys/mman.h>
#endif

__RCSID("$NetBSD: elf_end.c,v 1.5 2024/03/03 17:37:33 christos Exp $");
ELFTC_VCSID("Id: elf_end.c 3977 2022-05-01 06:45:34Z jkoshy");

int
elf_end(Elf *e)
{
       Elf *sv;
       Elf_Scn *scn, *tscn;

       if (e == NULL || e->e_activations == 0)
               return (0);

       if (--e->e_activations > 0)
               return (e->e_activations);

       assert(e->e_activations == 0);

       while (e && e->e_activations == 0) {
               switch (e->e_kind) {
               case ELF_K_AR:
                       /*
                        * If we still have open child descriptors, we
                        * need to defer reclaiming resources till all
                        * the child descriptors for the archive are
                        * closed.
                        */
                       if (e->e_u.e_ar.e_nchildren > 0)
                               return (0);
                       break;
               case ELF_K_ELF:
                       /*
                        * Reclaim all section descriptors.
                        */
                       STAILQ_FOREACH_SAFE(scn, &e->e_u.e_elf.e_scn, s_next,
                           tscn)
                               scn = _libelf_release_scn(scn);
                       break;
               case ELF_K_NUM:
                       assert(0);
               default:
                       break;
               }

               if (e->e_rawfile) {
                       if (e->e_flags & LIBELF_F_RAWFILE_MALLOC)
                               free(e->e_rawfile);
#if     ELFTC_HAVE_MMAP
                       else if (e->e_flags & LIBELF_F_RAWFILE_MMAP)
                               (void) munmap(e->e_rawfile, (size_t) e->e_rawsize);
#endif
               }

               sv = e;
               if ((e = e->e_parent) != NULL)
                       e->e_u.e_ar.e_nchildren--;
               _libelf_release_elf(sv);
       }

       return (0);
}