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/* Load a shared object at run time.
Copyright (C) 1995-2021 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
<https://www.gnu.org/licenses/>. */
#include <dlfcn.h>
#include <errno.h>
#include <libintl.h>
#include <stddef.h>
#include <unistd.h>
#include <ldsodefs.h>
#include <shlib-compat.h>
struct dlmopen_args
{
/* Namespace ID. */
Lmid_t nsid;
/* 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
_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 (__glibc_unlikely (args->mode & RTLD_GLOBAL))
_dl_signal_error (EINVAL, NULL, NULL, N_("invalid mode"));
}
args->new = GLRO(dl_open) (args->file ?: "", args->mode | __RTLD_DLOPEN,
args->caller,
args->nsid, __libc_argc, __libc_argv, __environ);
}
static void *
dlmopen_implementation (Lmid_t nsid, const char *file, int mode,
void *dl_caller)
{
struct dlmopen_args args;
args.nsid = nsid;
args.file = file;
args.mode = mode;
args.caller = dl_caller;
return _dlerror_run (dlmopen_doit, &args) ? NULL : args.new;
}
#ifdef SHARED
void *
___dlmopen (Lmid_t nsid, const char *file, int mode)
{
if (!rtld_active ())
return _dlfcn_hook->dlmopen (nsid, file, mode, RETURN_ADDRESS (0));
else
return dlmopen_implementation (nsid, file, mode, RETURN_ADDRESS (0));
}
versioned_symbol (libc, ___dlmopen, dlmopen, GLIBC_2_34);
# if OTHER_SHLIB_COMPAT (libdl, GLIBC_2_3_4, GLIBC_2_34)
compat_symbol (libdl, ___dlmopen, dlmopen, GLIBC_2_3_4);
# endif
#else /* !SHARED */
/* Also used with _dlfcn_hook. */
void *
__dlmopen (Lmid_t nsid, const char *file, int mode, void *dl_caller)
{
return dlmopen_implementation (nsid, file, mode, RETURN_ADDRESS (0));
}
void *
___dlmopen (Lmid_t nsid, const char *file, int mode)
{
struct link_map *l = __dlmopen (nsid, file, mode, RETURN_ADDRESS (0));
if (l != NULL)
{
__libc_register_dl_open_hook (l);
__libc_register_dlfcn_hook (l);
}
return l;
}
weak_alias (___dlmopen, dlmopen)
static_link_warning (dlmopen)
#endif /* !SHARED */
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