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45e4762c | 1 | /* dlinfo -- Get information from the dynamic linker. |
dff8da6b | 2 | Copyright (C) 2003-2024 Free Software Foundation, Inc. |
45e4762c RM |
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 | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
45e4762c RM |
18 | |
19 | #include <dlfcn.h> | |
20 | #include <link.h> | |
21 | #include <ldsodefs.h> | |
22 | #include <libintl.h> | |
6dfc0207 FW |
23 | #include <dl-tls.h> |
24 | #include <shlib-compat.h> | |
d78efd9f | 25 | |
45e4762c RM |
26 | struct dlinfo_args |
27 | { | |
45e4762c RM |
28 | void *handle; |
29 | int request; | |
30 | void *arg; | |
d056c212 FW |
31 | |
32 | /* This is the value that is returned from dlinfo if no error is | |
33 | signaled. */ | |
34 | int result; | |
45e4762c RM |
35 | }; |
36 | ||
37 | static void | |
38 | dlinfo_doit (void *argsblock) | |
39 | { | |
40 | struct dlinfo_args *const args = argsblock; | |
41 | struct link_map *l = args->handle; | |
42 | ||
45e4762c RM |
43 | switch (args->request) |
44 | { | |
45e4762c RM |
45 | case RTLD_DI_CONFIGADDR: |
46 | default: | |
d056c212 | 47 | args->result = -1; |
9e78f6f6 | 48 | _dl_signal_error (0, NULL, NULL, N_("unsupported dlinfo request")); |
45e4762c RM |
49 | break; |
50 | ||
c0f62c56 UD |
51 | case RTLD_DI_LMID: |
52 | *(Lmid_t *) args->arg = l->l_ns; | |
53 | break; | |
54 | ||
45e4762c RM |
55 | case RTLD_DI_LINKMAP: |
56 | *(struct link_map **) args->arg = l; | |
57 | break; | |
58 | ||
59 | case RTLD_DI_SERINFO: | |
60 | _dl_rtld_di_serinfo (l, args->arg, false); | |
61 | break; | |
62 | case RTLD_DI_SERINFOSIZE: | |
63 | _dl_rtld_di_serinfo (l, args->arg, true); | |
64 | break; | |
65 | ||
66 | case RTLD_DI_ORIGIN: | |
67 | strcpy (args->arg, l->l_origin); | |
68 | break; | |
d78efd9f RM |
69 | |
70 | case RTLD_DI_TLS_MODID: | |
71 | *(size_t *) args->arg = 0; | |
d78efd9f | 72 | *(size_t *) args->arg = l->l_tls_modid; |
d78efd9f RM |
73 | break; |
74 | ||
75 | case RTLD_DI_TLS_DATA: | |
76 | { | |
77 | void *data = NULL; | |
d78efd9f | 78 | if (l->l_tls_modid != 0) |
93025f93 | 79 | data = GLRO(dl_tls_get_addr_soft) (l); |
d78efd9f RM |
80 | *(void **) args->arg = data; |
81 | break; | |
82 | } | |
d056c212 FW |
83 | |
84 | case RTLD_DI_PHDR: | |
85 | *(const ElfW(Phdr) **) args->arg = l->l_phdr; | |
86 | args->result = l->l_phnum; | |
87 | break; | |
45e4762c RM |
88 | } |
89 | } | |
90 | ||
6dfc0207 FW |
91 | static int |
92 | dlinfo_implementation (void *handle, int request, void *arg) | |
93 | { | |
94 | struct dlinfo_args args = { handle, request, arg }; | |
d056c212 FW |
95 | _dlerror_run (&dlinfo_doit, &args); |
96 | return args.result; | |
6dfc0207 FW |
97 | } |
98 | ||
99 | #ifdef SHARED | |
45e4762c | 100 | int |
6dfc0207 | 101 | ___dlinfo (void *handle, int request, void *arg) |
45e4762c | 102 | { |
8dcb6d0a | 103 | if (GLRO (dl_dlfcn_hook) != NULL) |
466c1ea1 | 104 | return GLRO (dl_dlfcn_hook)->dlinfo (handle, request, arg); |
6dfc0207 FW |
105 | else |
106 | return dlinfo_implementation (handle, request, arg); | |
45e4762c | 107 | } |
6dfc0207 FW |
108 | versioned_symbol (libc, ___dlinfo, dlinfo, GLIBC_2_34); |
109 | ||
110 | # if OTHER_SHLIB_COMPAT (libdl, GLIBC_2_3_3, GLIBC_2_34) | |
111 | compat_symbol (libc, ___dlinfo, dlinfo, GLIBC_2_3_3); | |
5f21997b | 112 | # endif |
6dfc0207 FW |
113 | #else /* !SHARED */ |
114 | /* Also used with _dlfcn_hook. */ | |
115 | int | |
116 | __dlinfo (void *handle, int request, void *arg) | |
117 | { | |
118 | return dlinfo_implementation (handle, request, arg); | |
119 | } | |
120 | weak_alias (__dlinfo, dlinfo) | |
5f21997b | 121 | #endif |