1/* Load a shared object at run time.
2 Copyright (C) 1995-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <dlfcn.h>
20#include <stddef.h>
21#include <unistd.h>
22#include <ldsodefs.h>
23
24/* This file is for compatibility with glibc 2.0. Compile it only if
25 versioning is used. */
26#include <shlib-compat.h>
27#if SHLIB_COMPAT (libdl, GLIBC_2_0, GLIBC_2_1)
28
29struct dlopen_args
30{
31 /* The arguments for dlopen_doit. */
32 const char *file;
33 int mode;
34 /* The return value of dlopen_doit. */
35 void *new;
36 /* Address of the caller. */
37 const void *caller;
38};
39
40
41/* Non-shared code has no support for multiple namespaces. */
42#ifdef SHARED
43# define NS __LM_ID_CALLER
44#else
45# define NS LM_ID_BASE
46#endif
47
48
49static void
50dlopen_doit (void *a)
51{
52 struct dlopen_args *args = (struct dlopen_args *) a;
53
54 args->new = GLRO(dl_open) (args->file ?: "", args->mode | __RTLD_DLOPEN,
55 args->caller,
56 args->file == NULL ? LM_ID_BASE : NS,
57 __dlfcn_argc, __dlfcn_argv, __environ);
58}
59
60extern void *__dlopen_nocheck (const char *file, int mode);
61void *
62__dlopen_nocheck (const char *file, int mode)
63{
64 struct dlopen_args args;
65 args.file = file;
66 args.caller = RETURN_ADDRESS (0);
67
68 if ((mode & RTLD_BINDING_MASK) == 0)
69 /* By default assume RTLD_LAZY. */
70 mode |= RTLD_LAZY;
71 args.mode = mode;
72
73 if (!rtld_active ())
74 return _dlfcn_hook->dlopen (file, mode, RETURN_ADDRESS (0));
75
76 return _dlerror_run (dlopen_doit, &args) ? NULL : args.new;
77}
78compat_symbol (libdl, __dlopen_nocheck, dlopen, GLIBC_2_0);
79#endif
80