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/* dlinfo -- Get information from the dynamic linker.
Copyright (C) 2003-2018 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)
_dl_signal_error (0, NULL, NULL, N_("\
RTLD_SELF used in code not dynamically loaded"));
}
# endif
switch (args->request)
{
case RTLD_DI_CONFIGADDR:
default:
_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 (!rtld_active ())
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
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