elf/dl-object.c

   1 /* Storage management for the chain of loaded shared objects.
   2 Copyright (C) 1995 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
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, 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.  */
  28 struct link_map *_dl_loaded;
  29
  30 /* Tail of that list which were loaded at startup.  */
  31 struct link_map *_dl_startup_loaded;
  32
  33 /* Allocate a `struct link_map' for a new object being loaded,
  34    and enter it into the _dl_loaded list.  */
  35
  36 struct link_map *
  37 _dl_new_object (char *realname, const char *libname, int type)
  38 {
  39   struct link_map *new = malloc (sizeof *new);
  40   if (! new)
  41     _dl_signal_error (ENOMEM, libname,
  42                       "cannot allocate shared object descriptor");
  43
  44   memset (new, 0, sizeof *new);
  45   new->l_name = realname;
  46   new->l_libname = libname;
  47   new->l_type = type;
  48
  49   if (_dl_loaded == NULL)
  50     {
  51       new->l_prev = new->l_next = NULL;
  52       _dl_loaded = new;
  53     }
  54   else
  55     {
  56       struct link_map *l = _dl_loaded;
  57       while (l->l_next)
  58         l = l->l_next;
  59       new->l_prev = l;
  60       new->l_next = NULL;
  61       l->l_next = new;
  62     }
  63
  64   return new;
  65 }