1 /* Optional code to distinguish library flavours. 2 Copyright (C) 1998-2021 Free Software Foundation, Inc. 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 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _DL_LIBRECON_H 20 21 #include <sysdeps/unix/sysv/linux/dl-librecon.h> 22 23 #define DISTINGUISH_LIB_VERSIONS \ 24 do \ 25 { \ 26 /* We have to find out whether the binary is linked against \ 27 libc 5 or glibc. We do this by looking at all the DT_NEEDED \ 28 entries. If one is libc.so.5 this is a libc 5 linked binary. */ \ 29 if (main_map->l_info[DT_NEEDED]) \ 30 { \ 31 /* We have dependencies. */ \ 32 const ElfW(Dyn) *d; \ 33 const char *strtab; \ 34 \ 35 strtab = (const char *) D_PTR (main_map, l_info[DT_STRTAB]); \ 36 \ 37 for (d = main_map->l_ld; d->d_tag != DT_NULL; ++d) \ 38 if (d->d_tag == DT_NEEDED \ 39 && strcmp (strtab + d->d_un.d_val, "libc.so.5") == 0) \ 40 break; \ 41 \ 42 /* We print a `5' or `6' depending on the outcome. */ \ 43 _dl_printf (d->d_tag != DT_NULL ? "5\n" : "6\n"); \ 44 } \ 45 } \ 46 while (0) 47 48 /* Recognizing extra environment variables. */ 49 #define EXTRA_LD_ENVVARS \ 50 case 15: \ 51 if (memcmp (envline, "LIBRARY_VERSION", 15) == 0) \ 52 GLRO(dl_correct_cache_id) = envline[16] == '5' ? 2 : 3; \ 53 break; \ 54 55 /* Extra unsecure variables. The names are all stuffed in a single 56 string which means they have to be terminated with a '\0' explicitly. */ 57 #define EXTRA_UNSECURE_ENVVARS \ 58 "LD_AOUT_LIBRARY_PATH\0" \ 59 "LD_AOUT_PRELOAD\0" 60 61 #endif /* dl-librecon.h */ 62