| /* Load a shared object at run time. |
| Copyright (C) 1995-2014 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 <errno.h> |
| #include <libintl.h> |
| #include <stddef.h> |
| #include <unistd.h> |
| #include <ldsodefs.h> |
| |
| #if !defined SHARED && defined IS_IN_libdl |
| |
| void * |
| dlmopen (Lmid_t nsid, const char *file, int mode) |
| { |
| return __dlmopen (nsid, file, mode, RETURN_ADDRESS (0)); |
| } |
| #if 0 // Google-local |
| static_link_warning (dlmopen) |
| #endif |
| |
| #else |
| |
| struct dlmopen_args |
| { |
| /* Namespace ID. */ |
| Lmid_t nsid; |
| /* ELF header at offset in file. */ |
| off_t offset; |
| /* The arguments for dlopen_doit. */ |
| const char *file; |
| int mode; |
| /* The return value of dlopen_doit. */ |
| void *new; |
| /* Address of the caller. */ |
| const void *caller; |
| }; |
| |
| static void |
| dlmopen_doit (void *a) |
| { |
| struct dlmopen_args *args = (struct dlmopen_args *) a; |
| |
| /* Non-shared code has no support for multiple namespaces. */ |
| if (args->nsid != LM_ID_BASE) |
| { |
| # ifdef SHARED |
| /* If trying to open the link map for the main executable the namespace |
| must be the main one. */ |
| if (args->file == NULL) |
| # endif |
| GLRO(dl_signal_error) (EINVAL, NULL, NULL, N_("invalid namespace")); |
| |
| /* It makes no sense to use RTLD_GLOBAL when loading a DSO into |
| a namespace other than the base namespace. */ |
| if (__builtin_expect (args->mode & RTLD_GLOBAL, 0)) |
| GLRO(dl_signal_error) (EINVAL, NULL, NULL, N_("invalid mode")); |
| } |
| |
| args->new = GLRO(dl_open) (args->file ?: "", |
| args->offset, |
| args->mode | __RTLD_DLOPEN, |
| args->caller, |
| args->nsid, __dlfcn_argc, __dlfcn_argv, |
| __environ); |
| } |
| |
| |
| static void * |
| __dlmopen_common (struct dlmopen_args *args) |
| { |
| |
| # ifdef SHARED |
| return _dlerror_run (dlmopen_doit, args) ? NULL : args->new; |
| # else |
| if (_dlerror_run (dlmopen_doit, args)) |
| return NULL; |
| |
| __libc_register_dl_open_hook ((struct link_map *) args->new); |
| __libc_register_dlfcn_hook ((struct link_map *) args->new); |
| |
| return args->new; |
| # endif |
| } |
| |
| void * |
| __dlmopen_with_offset (Lmid_t nsid, const char *file, off_t offset, |
| int mode DL_CALLER_DECL) |
| { |
| # ifdef SHARED |
| if (__builtin_expect (_dlfcn_hook != NULL, 0)) |
| return _dlfcn_hook->dlmopen_with_offset (nsid, file, offset, |
| mode, RETURN_ADDRESS (0)); |
| # endif |
| |
| struct dlmopen_args args; |
| args.nsid = nsid; |
| args.file = file; |
| args.offset = offset; |
| args.mode = mode; |
| args.caller = DL_CALLER; |
| |
| return __dlmopen_common (&args); |
| } |
| # ifdef SHARED |
| strong_alias (__dlmopen_with_offset, __google_dlmopen_with_offset) |
| # endif |
| |
| void * |
| __dlmopen (Lmid_t nsid, const char *file, int mode DL_CALLER_DECL) |
| { |
| # ifdef SHARED |
| if (__builtin_expect (_dlfcn_hook != NULL, 0)) |
| return _dlfcn_hook->dlmopen (nsid, file, mode, RETURN_ADDRESS (0)); |
| # endif |
| |
| struct dlmopen_args args; |
| args.nsid = nsid; |
| args.file = file; |
| args.offset = 0; |
| args.mode = mode; |
| args.caller = DL_CALLER; |
| |
| return __dlmopen_common (&args); |
| } |
| # ifdef SHARED |
| strong_alias (__dlmopen, dlmopen) |
| # endif |
| #endif |