elf/dl-object.c

   1 /* Storage management for the chain of loaded shared objects.
   2    Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <link.h>
  21 #include <assert.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <errno.h>
  25
  26
  27 /* List of objects currently loaded is [2] of this, aka _dl_loaded.  */
  28 struct link_map *_dl_default_scope[5];
  29
  30 /* Allocate a `struct link_map' for a new object being loaded,
  31    and enter it into the _dl_loaded list.  */
  32
  33 struct link_map *
  34 _dl_new_object (char *realname, const char *libname, int type)
  35 {
  36   struct link_map *new = malloc (sizeof *new);
  37   struct libname_list *newname = malloc (sizeof *newname);
  38   if (! new || ! newname)
  39     return NULL;
  40
  41   memset (new, 0, sizeof *new);
  42   new->l_name = realname;
  43   newname->name = libname;
  44   newname->next = NULL;
  45   new->l_libname = newname;
  46   new->l_type = type;
  47
  48   if (_dl_loaded == NULL)
  49     {
  50       new->l_prev = new->l_next = NULL;
  51       _dl_loaded = new;
  52     }
  53   else
  54     {
  55       struct link_map *l = _dl_loaded;
  56       while (l->l_next)
  57         l = l->l_next;
  58       new->l_prev = l;
  59       new->l_next = NULL;
  60       l->l_next = new;
  61     }
  62
  63   return new;
  64 }