102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/* Load the dependencies of a mapped object.
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Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <link.h>
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#include <errno.h>
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#include <dlfcn.h>
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#include <stdlib.h>
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void
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_dl_map_object_deps (struct link_map *map)
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{
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struct list
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{
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struct link_map *map;
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struct list *next;
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};
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struct list head, *tailp, *scanp;
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unsigned int nlist;
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/* Start the search list with one element: MAP itself. */
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head.map = map;
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head.next = NULL;
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nlist = 1;
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/* Process each element of the search list, loading each of its immediate
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dependencies and appending them to the list as we step through it.
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This produces a flat, ordered list that represents a breadth-first
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search of the dependency tree. */
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for (scanp = tailp = &head; scanp; scanp = scanp->next)
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{
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struct link_map *l = scanp->map;
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/* We use `l_reserved' as a mark bit to detect objects we have
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already put in the search list and avoid adding duplicate elements
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later in the list. */
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l->l_reserved = 1;
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if (l->l_info[DT_NEEDED])
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{
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const char *strtab
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= ((void *) l->l_addr + l->l_info[DT_STRTAB]->d_un.d_ptr);
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const ElfW(Dyn) *d;
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for (d = l->l_ld; d->d_tag != DT_NULL; ++d)
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if (d->d_tag == DT_NEEDED)
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{
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/* Map in the needed object. */
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struct link_map *dep
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= _dl_map_object (l, strtab + d->d_un.d_val,
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l->l_type == lt_executable ? lt_library :
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l->l_type);
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if (dep->l_reserved)
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/* This object is already in the search list we are
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building. Don't add a duplicate pointer. Release the
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reference just added by _dl_map_object. */
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--dep->l_opencount;
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else
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{
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/* Append DEP to the search list. */
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tailp->next = alloca (sizeof *tailp);
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tailp = tailp->next;
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tailp->map = dep;
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tailp->next = NULL;
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++nlist;
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}
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}
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}
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}
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/* Store the search list we built in the object. It will be used for
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searches in the scope of this object. */
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map->l_searchlist = malloc (nlist * sizeof (struct link_map *));
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map->l_nsearchlist = nlist;
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nlist = 0;
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for (scanp = &head; scanp; scanp = scanp->next)
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{
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map->l_searchlist[nlist++] = scanp->map;
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/* Now clear all the mark bits we set in the objects on the search list
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to avoid duplicates, so the next call starts fresh. */
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scanp->map->l_reserved = 0;
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}
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}
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