1 | /* Load a shared object at run time. |
2 | Copyright (C) 1995-2017 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 | <http://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 | |
27 | void * |
28 | dlopen (const char *file, int mode) |
29 | { |
30 | return __dlopen (file, mode, RETURN_ADDRESS (0)); |
31 | } |
32 | static_link_warning (dlopen) |
33 | |
34 | #else |
35 | |
36 | struct 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 | |
56 | static void |
57 | dlopen_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 | |
73 | void * |
74 | __dlopen (const char *file, int mode DL_CALLER_DECL) |
75 | { |
76 | # ifdef SHARED |
77 | if (__glibc_unlikely (_dlfcn_hook != NULL)) |
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> |
100 | strong_alias (__dlopen, __dlopen_check) |
101 | versioned_symbol (libdl, __dlopen_check, dlopen, GLIBC_2_1); |
102 | # endif |
103 | #endif |
104 | |