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91c2e6c3db
The information is theoretically available via dl_iterate_phdr as
well, but that approach is very slow if there are many shared
objects.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@rehdat.com>
(cherry picked from commit d056c21213)
122 lines
3.0 KiB
C
122 lines
3.0 KiB
C
/* dlinfo -- Get information from the dynamic linker.
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Copyright (C) 2003-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <dlfcn.h>
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#include <link.h>
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#include <ldsodefs.h>
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#include <libintl.h>
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#include <dl-tls.h>
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#include <shlib-compat.h>
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struct dlinfo_args
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{
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void *handle;
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int request;
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void *arg;
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/* This is the value that is returned from dlinfo if no error is
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signaled. */
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int result;
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};
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static void
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dlinfo_doit (void *argsblock)
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{
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struct dlinfo_args *const args = argsblock;
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struct link_map *l = args->handle;
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switch (args->request)
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{
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case RTLD_DI_CONFIGADDR:
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default:
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args->result = -1;
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_dl_signal_error (0, NULL, NULL, N_("unsupported dlinfo request"));
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break;
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case RTLD_DI_LMID:
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*(Lmid_t *) args->arg = l->l_ns;
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break;
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case RTLD_DI_LINKMAP:
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*(struct link_map **) args->arg = l;
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break;
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case RTLD_DI_SERINFO:
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_dl_rtld_di_serinfo (l, args->arg, false);
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break;
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case RTLD_DI_SERINFOSIZE:
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_dl_rtld_di_serinfo (l, args->arg, true);
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break;
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case RTLD_DI_ORIGIN:
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strcpy (args->arg, l->l_origin);
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break;
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case RTLD_DI_TLS_MODID:
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*(size_t *) args->arg = 0;
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*(size_t *) args->arg = l->l_tls_modid;
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break;
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case RTLD_DI_TLS_DATA:
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{
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void *data = NULL;
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if (l->l_tls_modid != 0)
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data = GLRO(dl_tls_get_addr_soft) (l);
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*(void **) args->arg = data;
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break;
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}
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case RTLD_DI_PHDR:
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*(const ElfW(Phdr) **) args->arg = l->l_phdr;
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args->result = l->l_phnum;
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break;
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}
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}
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static int
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dlinfo_implementation (void *handle, int request, void *arg)
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{
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struct dlinfo_args args = { handle, request, arg };
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_dlerror_run (&dlinfo_doit, &args);
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return args.result;
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}
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#ifdef SHARED
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int
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___dlinfo (void *handle, int request, void *arg)
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{
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if (GLRO (dl_dlfcn_hook) != NULL)
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return GLRO (dl_dlfcn_hook)->dlinfo (handle, request, arg);
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else
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return dlinfo_implementation (handle, request, arg);
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}
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versioned_symbol (libc, ___dlinfo, dlinfo, GLIBC_2_34);
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# if OTHER_SHLIB_COMPAT (libdl, GLIBC_2_3_3, GLIBC_2_34)
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compat_symbol (libc, ___dlinfo, dlinfo, GLIBC_2_3_3);
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# endif
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#else /* !SHARED */
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/* Also used with _dlfcn_hook. */
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int
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__dlinfo (void *handle, int request, void *arg)
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{
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return dlinfo_implementation (handle, request, arg);
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}
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weak_alias (__dlinfo, dlinfo)
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#endif
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