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glibc/dlfcn/dlinfo.c
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/* dlinfo -- Get information from the dynamic linker. | |
Copyright (C) 2003-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <dlfcn.h> | |
#include <link.h> | |
#include <ldsodefs.h> | |
#include <libintl.h> | |
#if !defined SHARED && IS_IN (libdl) | |
int | |
dlinfo (void *handle, int request, void *arg) | |
{ | |
return __dlinfo (handle, request, arg, RETURN_ADDRESS (0)); | |
} | |
#else | |
# include <dl-tls.h> | |
struct dlinfo_args | |
{ | |
ElfW(Addr) caller; | |
void *handle; | |
int request; | |
void *arg; | |
}; | |
static void | |
dlinfo_doit (void *argsblock) | |
{ | |
struct dlinfo_args *const args = argsblock; | |
struct link_map *l = args->handle; | |
# if 0 | |
if (args->handle == RTLD_SELF) | |
{ | |
Lmid_t nsid; | |
/* Find the highest-addressed object that CALLER is not below. */ | |
for (nsid = 0; nsid < DL_NNS; ++nsid) | |
for (l = GL(dl_ns)[nsid]._ns_loaded; l != NULL; l = l->l_next) | |
if (caller >= l->l_map_start && caller < l->l_map_end | |
&& (l->l_contiguous || _dl_addr_inside_object (l, caller))) | |
break; | |
if (l == NULL) | |
GLRO(dl_signal_error) (0, NULL, NULL, N_("\ | |
RTLD_SELF used in code not dynamically loaded")); | |
} | |
# endif | |
switch (args->request) | |
{ | |
case RTLD_DI_CONFIGADDR: | |
default: | |
GLRO(dl_signal_error) (0, NULL, NULL, N_("unsupported dlinfo request")); | |
break; | |
case RTLD_DI_LMID: | |
*(Lmid_t *) args->arg = l->l_ns; | |
break; | |
case RTLD_DI_LINKMAP: | |
*(struct link_map **) args->arg = l; | |
break; | |
case RTLD_DI_SERINFO: | |
_dl_rtld_di_serinfo (l, args->arg, false); | |
break; | |
case RTLD_DI_SERINFOSIZE: | |
_dl_rtld_di_serinfo (l, args->arg, true); | |
break; | |
case RTLD_DI_ORIGIN: | |
strcpy (args->arg, l->l_origin); | |
break; | |
case RTLD_DI_TLS_MODID: | |
*(size_t *) args->arg = 0; | |
*(size_t *) args->arg = l->l_tls_modid; | |
break; | |
case RTLD_DI_TLS_DATA: | |
{ | |
void *data = NULL; | |
if (l->l_tls_modid != 0) | |
data = GLRO(dl_tls_get_addr_soft) (l); | |
*(void **) args->arg = data; | |
break; | |
} | |
} | |
} | |
int | |
__dlinfo (void *handle, int request, void *arg DL_CALLER_DECL) | |
{ | |
# ifdef SHARED | |
if (__glibc_unlikely (_dlfcn_hook != NULL)) | |
return _dlfcn_hook->dlinfo (handle, request, arg, | |
DL_CALLER); | |
# endif | |
struct dlinfo_args args = { (ElfW(Addr)) DL_CALLER, | |
handle, request, arg }; | |
return _dlerror_run (&dlinfo_doit, &args) ? -1 : 0; | |
} | |
# ifdef SHARED | |
strong_alias (__dlinfo, dlinfo) | |
# endif | |
#endif |