glibc/elf/dl-object.c

/* Storage management for the chain of loaded shared objects.
Copyright (C) 1995 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <link.h>
#include <assert.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>


/* List of objects currently loaded.  */
struct link_map *_dl_loaded;

/* Tail of that list which were loaded at startup.  */
struct link_map *_dl_startup_loaded;

/* Allocate a `struct link_map' for a new object being loaded,
   and enter it into the _dl_loaded list.  */

struct link_map *
_dl_new_object (char *realname, const char *libname, int type)
{
  struct link_map *new = malloc (sizeof *new);
  if (! new)
    _dl_signal_error (ENOMEM, libname,
		      "cannot allocate shared object descriptor");

  memset (new, 0, sizeof *new);
  new->l_name = realname;
  new->l_libname = libname;
  new->l_type = type;

  if (_dl_loaded == NULL)
    {
      new->l_prev = new->l_next = NULL;
      _dl_loaded = new;
    }
  else
    {
      struct link_map *l = _dl_loaded;
      while (l->l_next)
	l = l->l_next;
      new->l_prev = l;
      new->l_next = NULL;
      l->l_next = new;
    }

  return new;
}