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 <libintl.h>
21#include <stddef.h>
22#include <unistd.h>
23#include <ldsodefs.h>
24
25#if !defined SHARED && IS_IN (libdl)
26
27void *
28dlopen (const char *file, int mode)
29{
30 return __dlopen (file, mode, RETURN_ADDRESS (0));
31}
32static_link_warning (dlopen)
33
34#else
35
36struct dlopen_args
37{
38 /* The arguments for dlopen_doit. */
39 const char *file;
40 int mode;
41 /* The return value of dlopen_doit. */
42 void *new;
43 /* Address of the caller. */
44 const void *caller;
45};
46
47
48/* Non-shared code has no support for multiple namespaces. */
49# ifdef SHARED
50# define NS __LM_ID_CALLER
51# else
52# define NS LM_ID_BASE
53# endif
54
55
56static void
57dlopen_doit (void *a)
58{
59 struct dlopen_args *args = (struct dlopen_args *) a;
60
61 if (args->mode & ~(RTLD_BINDING_MASK | RTLD_NOLOAD | RTLD_DEEPBIND
62 | RTLD_GLOBAL | RTLD_LOCAL | RTLD_NODELETE
63 | __RTLD_SPROF))
64 _dl_signal_error (0, NULL, NULL, _("invalid mode parameter"));
65
66 args->new = GLRO(dl_open) (args->file ?: "", args->mode | __RTLD_DLOPEN,
67 args->caller,
68 args->file == NULL ? LM_ID_BASE : NS,
69 __dlfcn_argc, __dlfcn_argv, __environ);
70}
71
72
73void *
74__dlopen (const char *file, int mode DL_CALLER_DECL)
75{
76# ifdef SHARED
77 if (!rtld_active ())
78 return _dlfcn_hook->dlopen (file, mode, DL_CALLER);
79# endif
80
81 struct dlopen_args args;
82 args.file = file;
83 args.mode = mode;
84 args.caller = DL_CALLER;
85
86# ifdef SHARED
87 return _dlerror_run (dlopen_doit, &args) ? NULL : args.new;
88# else
89 if (_dlerror_run (dlopen_doit, &args))
90 return NULL;
91
92 __libc_register_dl_open_hook ((struct link_map *) args.new);
93 __libc_register_dlfcn_hook ((struct link_map *) args.new);
94
95 return args.new;
96# endif
97}
98# ifdef SHARED
99# include <shlib-compat.h>
100strong_alias (__dlopen, __dlopen_check)
101versioned_symbol (libdl, __dlopen_check, dlopen, GLIBC_2_1);
102# endif
103#endif
104