1 | /* dlinfo -- Get information from the dynamic linker. |
2 | Copyright (C) 2003-2016 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 <link.h> |
21 | #include <ldsodefs.h> |
22 | #include <libintl.h> |
23 | |
24 | #if !defined SHARED && IS_IN (libdl) |
25 | |
26 | int |
27 | dlinfo (void *handle, int request, void *arg) |
28 | { |
29 | return __dlinfo (handle, request, arg, RETURN_ADDRESS (0)); |
30 | } |
31 | |
32 | #else |
33 | |
34 | # include <dl-tls.h> |
35 | |
36 | struct dlinfo_args |
37 | { |
38 | ElfW(Addr) caller; |
39 | void *handle; |
40 | int request; |
41 | void *arg; |
42 | }; |
43 | |
44 | static void |
45 | dlinfo_doit (void *argsblock) |
46 | { |
47 | struct dlinfo_args *const args = argsblock; |
48 | struct link_map *l = args->handle; |
49 | |
50 | # if 0 |
51 | if (args->handle == RTLD_SELF) |
52 | { |
53 | Lmid_t nsid; |
54 | |
55 | /* Find the highest-addressed object that CALLER is not below. */ |
56 | for (nsid = 0; nsid < DL_NNS; ++nsid) |
57 | for (l = GL(dl_ns)[nsid]._ns_loaded; l != NULL; l = l->l_next) |
58 | if (caller >= l->l_map_start && caller < l->l_map_end |
59 | && (l->l_contiguous || _dl_addr_inside_object (l, caller))) |
60 | break; |
61 | |
62 | if (l == NULL) |
63 | GLRO(dl_signal_error) (0, NULL, NULL, N_("\ |
64 | RTLD_SELF used in code not dynamically loaded" )); |
65 | } |
66 | # endif |
67 | |
68 | switch (args->request) |
69 | { |
70 | case RTLD_DI_CONFIGADDR: |
71 | default: |
72 | GLRO(dl_signal_error) (0, NULL, NULL, N_("unsupported dlinfo request" )); |
73 | break; |
74 | |
75 | case RTLD_DI_LMID: |
76 | *(Lmid_t *) args->arg = l->l_ns; |
77 | break; |
78 | |
79 | case RTLD_DI_LINKMAP: |
80 | *(struct link_map **) args->arg = l; |
81 | break; |
82 | |
83 | case RTLD_DI_SERINFO: |
84 | _dl_rtld_di_serinfo (l, args->arg, false); |
85 | break; |
86 | case RTLD_DI_SERINFOSIZE: |
87 | _dl_rtld_di_serinfo (l, args->arg, true); |
88 | break; |
89 | |
90 | case RTLD_DI_ORIGIN: |
91 | strcpy (args->arg, l->l_origin); |
92 | break; |
93 | |
94 | case RTLD_DI_TLS_MODID: |
95 | *(size_t *) args->arg = 0; |
96 | *(size_t *) args->arg = l->l_tls_modid; |
97 | break; |
98 | |
99 | case RTLD_DI_TLS_DATA: |
100 | { |
101 | void *data = NULL; |
102 | if (l->l_tls_modid != 0) |
103 | data = GLRO(dl_tls_get_addr_soft) (l); |
104 | *(void **) args->arg = data; |
105 | break; |
106 | } |
107 | } |
108 | } |
109 | |
110 | int |
111 | __dlinfo (void *handle, int request, void *arg DL_CALLER_DECL) |
112 | { |
113 | # ifdef SHARED |
114 | if (__glibc_unlikely (_dlfcn_hook != NULL)) |
115 | return _dlfcn_hook->dlinfo (handle, request, arg, |
116 | DL_CALLER); |
117 | # endif |
118 | |
119 | struct dlinfo_args args = { (ElfW(Addr)) DL_CALLER, |
120 | handle, request, arg }; |
121 | return _dlerror_run (&dlinfo_doit, &args) ? -1 : 0; |
122 | } |
123 | # ifdef SHARED |
124 | strong_alias (__dlinfo, dlinfo) |
125 | # endif |
126 | #endif |
127 | |