/* Load a shared object at run time.

   Copyright (C) 1995-2018 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, see

   <http://www.gnu.org/licenses/>.  */

#include <dlfcn.h>

#include <libintl.h>

#include <stddef.h>

#include <unistd.h>

#include <ldsodefs.h>

#if !defined SHARED && IS_IN (libdl)

void *

dlopen (const char *file, int mode)

{

  return __dlopen (file, mode, RETURN_ADDRESS (0));

}

static_link_warning (dlopen)

#else

struct dlopen_args

{

  /* The arguments for dlopen_doit.  */

  const char *file;

  int mode;

  /* The return value of dlopen_doit.  */

  void *new;

  /* Address of the caller.  */

  const void *caller;

};

/* Non-shared code has no support for multiple namespaces.  */

# ifdef SHARED

#  define NS __LM_ID_CALLER

# else

#  define NS LM_ID_BASE

# endif

static void

dlopen_doit (void *a)

{

  struct dlopen_args *args = (struct dlopen_args *) a;

  if (args->mode & ~(RTLD_BINDING_MASK | RTLD_NOLOAD | RTLD_DEEPBIND

		     | RTLD_GLOBAL | RTLD_LOCAL | RTLD_NODELETE

		     | __RTLD_SPROF))

    _dl_signal_error (0, NULL, NULL, _("invalid mode parameter"));

  args->new = GLRO(dl_open) (args->file ?: "", args->mode | __RTLD_DLOPEN,

			     args->caller,

			     args->file == NULL ? LM_ID_BASE : NS,

			     __dlfcn_argc, __dlfcn_argv, __environ);

}

void *

__dlopen (const char *file, int mode DL_CALLER_DECL)

{

# ifdef SHARED

  if (!rtld_active ())

    return _dlfcn_hook->dlopen (file, mode, DL_CALLER);

# endif

  struct dlopen_args args;

  args.file = file;

  args.mode = mode;

  args.caller = DL_CALLER;

# ifdef SHARED

  return _dlerror_run (dlopen_doit, &args) ? NULL : args.new;

# else

  if (_dlerror_run (dlopen_doit, &args))

    return NULL;

  __libc_register_dl_open_hook ((struct link_map *) args.new);

  __libc_register_dlfcn_hook ((struct link_map *) args.new);

  return args.new;

# endif

}

# ifdef SHARED

#  include <shlib-compat.h>

strong_alias (__dlopen, __dlopen_check)

versioned_symbol (libdl, __dlopen_check, dlopen, GLIBC_2_1);

# endif

#endif