glibc/dlfcn/dlopen.c
Paul Eggert 581c785bf3 Update copyright dates with scripts/update-copyrights
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 7061 files FOO.

I then removed trailing white space from math/tgmath.h,
support/tst-support-open-dev-null-range.c, and
sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following
obscure pre-commit check failure diagnostics from Savannah.  I don't
know why I run into these diagnostics whereas others evidently do not.

remote: *** 912-#endif
remote: *** 913:
remote: *** 914-
remote: *** error: lines with trailing whitespace found
...
remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
2022-01-01 11:40:24 -08:00

104 lines
2.8 KiB
C

/* Load a shared object at run time.
Copyright (C) 1995-2022 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 <libintl.h>
#include <stddef.h>
#include <unistd.h>
#include <ldsodefs.h>
#include <shlib-compat.h>
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,
__libc_argc, __libc_argv, __environ);
}
static void *
dlopen_implementation (const char *file, int mode, void *dl_caller)
{
struct dlopen_args args;
args.file = file;
args.mode = mode;
args.caller = dl_caller;
return _dlerror_run (dlopen_doit, &args) ? NULL : args.new;
}
#ifdef SHARED
void *
___dlopen (const char *file, int mode)
{
if (!rtld_active ())
return GLRO (dl_dlfcn_hook)->dlopen (file, mode, RETURN_ADDRESS (0));
else
return dlopen_implementation (file, mode, RETURN_ADDRESS (0));
}
versioned_symbol (libc, ___dlopen, dlopen, GLIBC_2_34);
# if OTHER_SHLIB_COMPAT (libdl, GLIBC_2_1, GLIBC_2_34)
compat_symbol (libdl, ___dlopen, dlopen, GLIBC_2_1);
# endif
#else /* !SHARED */
/* Also used with _dlfcn_hook. */
void *
__dlopen (const char *file, int mode, void *dl_caller)
{
return dlopen_implementation (file, mode, RETURN_ADDRESS (0));
}
void *
___dlopen (const char *file, int mode)
{
return __dlopen (file, mode, RETURN_ADDRESS (0));
}
weak_alias (___dlopen, dlopen)
static_link_warning (dlopen)
#endif /* !SHARED */