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/* Close a shared object opened by `_dl_open'.

   Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <assert.h>

#include <dlfcn.h>

#include <libintl.h>

#include <stdlib.h>

#include <string.h>

#include <bits/libc-lock.h>

#include <ldsodefs.h>

#include <sys/types.h>

#include <sys/mman.h>

/* Type of the constructor functions.  */

typedef void (*fini_t) (void);

void

internal_function

_dl_close (void *_map)

{

  struct reldep_list

  {

    struct link_map **rellist;

    unsigned int nrellist;

    struct reldep_list *next;

  } *reldeps = NULL;

  struct link_map **list;

  struct link_map *map = _map;

  unsigned int i;

  unsigned int *new_opencount;

  /* First see whether we can remove the object at all.  */

  if (__builtin_expect (map->l_flags_1 & DF_1_NODELETE, 0)

      && map->l_init_called)

    /* Nope.  Do nothing.  */

    return;

  if (__builtin_expect (map->l_opencount, 1) == 0)

    _dl_signal_error (0, map->l_name, NULL, N_("shared object not open"));

  /* Acquire the lock.  */

#ifdef HAVE_DD_LOCK

    __lock_acquire(_dl_load_lock);

#endif

  /* Decrement the reference count.  */

  if (map->l_opencount > 1 || map->l_type != lt_loaded)

    {

      /* There are still references to this object.  Do nothing more.  */

      if (__builtin_expect (_dl_debug_mask & DL_DEBUG_FILES, 0))

        _dl_debug_printf ("\nclosing file=%s; opencount == %u\n",

                          map->l_name, map->l_opencount);

      /* One decrement the object itself, not the dependencies.  */

      --map->l_opencount;

#ifdef HAVE_DD_LOCK

        __lock_release(_dl_load_lock);

#endif

      return;

    }

  list = map->l_initfini;

  /* Compute the new l_opencount values.  */

  i = map->l_searchlist.r_nlist;

  if (__builtin_expect (i == 0, 0))

    /* This can happen if we handle relocation dependencies for an

       object which wasn't loaded directly.  */

    for (i = 1; list[i] != NULL; ++i)

      ;

  new_opencount = (unsigned int *) alloca (i * sizeof (unsigned int));

  for (i = 0; list[i] != NULL; ++i)

    {

      list[i]->l_idx = i;

      new_opencount[i] = list[i]->l_opencount;

    }

  --new_opencount[0];

  for (i = 1; list[i] != NULL; ++i)

    if ((! (list[i]->l_flags_1 & DF_1_NODELETE) || ! list[i]->l_init_called)

        /* Decrement counter.  */

        && --new_opencount[i] == 0

        /* Test whether this object was also loaded directly.  */

        && list[i]->l_searchlist.r_list != NULL)

      {

        /* In this case we have the decrement all the dependencies of

           this object.  They are all in MAP's dependency list.  */

        unsigned int j;

        struct link_map **dep_list = list[i]->l_searchlist.r_list;

        for (j = 1; j < list[i]->l_searchlist.r_nlist; ++j)

          if (! (dep_list[j]->l_flags_1 & DF_1_NODELETE)

              || ! dep_list[j]->l_init_called)

            {

              assert (dep_list[j]->l_idx < map->l_searchlist.r_nlist);

              --new_opencount[dep_list[j]->l_idx];

            }

      }

  assert (new_opencount[0] == 0);

  /* Call all termination functions at once.  */

  for (i = 0; list[i] != NULL; ++i)

    {

      struct link_map *imap = list[i];

      if (new_opencount[i] == 0 && imap->l_type == lt_loaded

          && (imap->l_info[DT_FINI] || imap->l_info[DT_FINI_ARRAY])

          && (! (imap->l_flags_1 & DF_1_NODELETE) || ! imap->l_init_called)

          /* Skip any half-cooked objects that were never initialized.  */

          && imap->l_init_called)

        {

          /* When debugging print a message first.  */

          if (__builtin_expect (_dl_debug_mask & DL_DEBUG_IMPCALLS, 0))

            _dl_debug_printf ("\ncalling fini: %s\n\n", imap->l_name);

          /* Call its termination function.  */

          if (imap->l_info[DT_FINI_ARRAY] != NULL)

            {

              ElfW(Addr) *array =

                (ElfW(Addr) *) (imap->l_addr

                                + imap->l_info[DT_FINI_ARRAY]->d_un.d_ptr);

              unsigned int sz = (imap->l_info[DT_FINI_ARRAYSZ]->d_un.d_val

                                 / sizeof (ElfW(Addr)));

              unsigned int cnt;

              for (cnt = 0; cnt < sz; ++cnt)

                ((fini_t) (imap->l_addr + array[cnt])) ();

            }

          /* Next try the old-style destructor.  */

          if (imap->l_info[DT_FINI] != NULL)

            (*(void (*) (void)) DL_DT_FINI_ADDRESS

              (imap, (void *) imap->l_addr

                     + imap->l_info[DT_FINI]->d_un.d_ptr)) ();

        }

      else if (new_opencount[i] != 0 && imap->l_type == lt_loaded)

        {

          /* The object is still used.  But the object we are unloading

             right now is responsible for loading it and therefore we

             have the search list of the current object in its scope.

             Remove it.  */

          struct r_scope_elem **runp = imap->l_scope;

          while (*runp != NULL)

            if (*runp == &map->l_searchlist)

              {

                /* Copy all later elements.  */

                while ((runp[0] = runp[1]) != NULL)

                  ++runp;

                break;

              }

          else

            ++runp;

        }

      /* Store the new l_opencount value.  */

      imap->l_opencount = new_opencount[i];

      /* Just a sanity check.  */

      assert (imap->l_type == lt_loaded || imap->l_opencount > 0);

    }

  /* Notify the debugger we are about to remove some loaded objects.  */

  _r_debug.r_state = RT_DELETE;

  _dl_debug_state ();

  /* Check each element of the search list to see if all references to

     it are gone.  */

  for (i = 0; list[i] != NULL; ++i)

    {

      struct link_map *imap = list[i];

      if (imap->l_opencount == 0 && imap->l_type == lt_loaded)

        {

          struct libname_list *lnp;

          /* That was the last reference, and this was a dlopen-loaded

             object.  We can unmap it.  */

          if (__builtin_expect (imap->l_global, 0))

            {

              /* This object is in the global scope list.  Remove it.  */

              unsigned int cnt = _dl_main_searchlist->r_nlist;

              do

                --cnt;

              while (_dl_main_searchlist->r_list[cnt] != imap);

              /* The object was already correctly registered.  */

              while (++cnt < _dl_main_searchlist->r_nlist)

                _dl_main_searchlist->r_list[cnt - 1]

                  = _dl_main_searchlist->r_list[cnt];

              --_dl_main_searchlist->r_nlist;

            }

          /* We can unmap all the maps at once.  We determined the

             start address and length when we loaded the object and

             the `munmap' call does the rest.  */

          DL_UNMAP (imap);

          /* Finally, unlink the data structure and free it.  */

#ifdef SHARED

          /* We will unlink the first object only if this is a statically

             linked program.  */

          assert (imap->l_prev != NULL);

          imap->l_prev->l_next = imap->l_next;

#else

          if (imap->l_prev != NULL)

            imap->l_prev->l_next = imap->l_next;

          else

            _dl_loaded = imap->l_next;

#endif

          --_dl_nloaded;

          if (imap->l_next)

            imap->l_next->l_prev = imap->l_prev;

          if (imap->l_versions != NULL)

            free (imap->l_versions);

          if (imap->l_origin != NULL && imap->l_origin != (char *) -1)

            free ((char *) imap->l_origin);

          /* If the object has relocation dependencies save this

             information for latter.  */

          if (__builtin_expect (imap->l_reldeps != NULL, 0))

            {

              struct reldep_list *newrel;

              newrel = (struct reldep_list *) alloca (sizeof (*reldeps));

              newrel->rellist = imap->l_reldeps;

              newrel->nrellist = imap->l_reldepsact;

              newrel->next = reldeps;

              reldeps = newrel;

            }

          /* This name always is allocated.  */

          free (imap->l_name);

          /* Remove the list with all the names of the shared object.  */

          lnp = imap->l_libname;

          do

            {

              struct libname_list *this = lnp;

              lnp = lnp->next;

              if (!this->dont_free)

                free (this);

            }

          while (lnp != NULL);

          /* Remove the searchlists.  */

          if (imap != map)

              free (imap->l_initfini);

          /* Remove the scope array if we allocated it.  */

          if (imap->l_scope != imap->l_scope_mem)

            free (imap->l_scope);

          if (imap->l_phdr_allocated)

            free ((void *) imap->l_phdr);

          if (imap->l_rpath_dirs.dirs != (void *) -1)

            free (imap->l_rpath_dirs.dirs);

          if (imap->l_runpath_dirs.dirs != (void *) -1)

            free (imap->l_runpath_dirs.dirs);

          free (imap);

        }

    }

  /* Notify the debugger those objects are finalized and gone.  */

  _r_debug.r_state = RT_CONSISTENT;

  _dl_debug_state ();

  /* Now we can perhaps also remove the modules for which we had

     dependencies because of symbol lookup.  */

  while (__builtin_expect (reldeps != NULL, 0))

    {

      while (reldeps->nrellist-- > 0)

        _dl_close (reldeps->rellist[reldeps->nrellist]);

      free (reldeps->rellist);

      reldeps = reldeps->next;

    }

  free (list);

  /* Release the lock.  */

#ifdef HAVE_DD_LOCK

    __lock_release(_dl_load_lock);

#endif

}

static void

free_mem (void)

{

  if (__builtin_expect (_dl_global_scope_alloc, 0) != 0

      && _dl_main_searchlist->r_nlist == _dl_initial_searchlist.r_nlist)

    {

      /* All object dynamically loaded by the program are unloaded.  Free

         the memory allocated for the global scope variable.  */

      struct link_map **old = _dl_main_searchlist->r_list;

      /* Put the old map in.  */

      _dl_main_searchlist->r_list = _dl_initial_searchlist.r_list;

      /* Signal that the original map is used.  */

      _dl_global_scope_alloc = 0;

      /* Now free the old map.  */

      free (old);

    }

}

text_set_element (__libc_subfreeres, free_mem);