blob: 6e297d4d6962419247da41236d62dd3e3f49ecf4 [file] [log] [blame]
/* Load a shared object at run time.
Copyright (C) 1995-2014 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 <errno.h>
#include <libintl.h>
#include <stddef.h>
#include <unistd.h>
#include <ldsodefs.h>
#if !defined SHARED && defined IS_IN_libdl
void *
dlmopen (Lmid_t nsid, const char *file, int mode)
{
return __dlmopen (nsid, file, mode, RETURN_ADDRESS (0));
}
#if 0 // Google-local
static_link_warning (dlmopen)
#endif
#else
struct dlmopen_args
{
/* Namespace ID. */
Lmid_t nsid;
/* ELF header at offset in file. */
off_t offset;
/* 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;
};
static void
dlmopen_doit (void *a)
{
struct dlmopen_args *args = (struct dlmopen_args *) a;
/* Non-shared code has no support for multiple namespaces. */
if (args->nsid != LM_ID_BASE)
{
# ifdef SHARED
/* If trying to open the link map for the main executable the namespace
must be the main one. */
if (args->file == NULL)
# endif
GLRO(dl_signal_error) (EINVAL, NULL, NULL, N_("invalid namespace"));
/* It makes no sense to use RTLD_GLOBAL when loading a DSO into
a namespace other than the base namespace. */
if (__builtin_expect (args->mode & RTLD_GLOBAL, 0))
GLRO(dl_signal_error) (EINVAL, NULL, NULL, N_("invalid mode"));
}
args->new = GLRO(dl_open) (args->file ?: "",
args->offset,
args->mode | __RTLD_DLOPEN,
args->caller,
args->nsid, __dlfcn_argc, __dlfcn_argv,
__environ);
}
static void *
__dlmopen_common (struct dlmopen_args *args)
{
# ifdef SHARED
return _dlerror_run (dlmopen_doit, args) ? NULL : args->new;
# else
if (_dlerror_run (dlmopen_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
}
void *
__dlmopen_with_offset (Lmid_t nsid, const char *file, off_t offset,
int mode DL_CALLER_DECL)
{
# ifdef SHARED
if (__builtin_expect (_dlfcn_hook != NULL, 0))
return _dlfcn_hook->dlmopen_with_offset (nsid, file, offset,
mode, RETURN_ADDRESS (0));
# endif
struct dlmopen_args args;
args.nsid = nsid;
args.file = file;
args.offset = offset;
args.mode = mode;
args.caller = DL_CALLER;
return __dlmopen_common (&args);
}
# ifdef SHARED
strong_alias (__dlmopen_with_offset, __google_dlmopen_with_offset)
# endif
void *
__dlmopen (Lmid_t nsid, const char *file, int mode DL_CALLER_DECL)
{
# ifdef SHARED
if (__builtin_expect (_dlfcn_hook != NULL, 0))
return _dlfcn_hook->dlmopen (nsid, file, mode, RETURN_ADDRESS (0));
# endif
struct dlmopen_args args;
args.nsid = nsid;
args.file = file;
args.offset = 0;
args.mode = mode;
args.caller = DL_CALLER;
return __dlmopen_common (&args);
}
# ifdef SHARED
strong_alias (__dlmopen, dlmopen)
# endif
#endif