1 /* Test if an executable can read from rtld_global_ro._dl_cache_line_size. 2 Copyright (C) 2020-2021 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 #include <stdio.h> 20 #include <stdint.h> 21 #include <inttypes.h> 22 #include <sys/auxv.h> 23 #include <ldsodefs.h> 24 #include <errno.h> 25 26 /* errnop is required in order to work around BZ #20802. */ 27 int test_cache(int * errnop)28test_cache (int *errnop) 29 { 30 int cls1 = GLRO (dl_cache_line_size); 31 errno = *errnop; 32 uint64_t cls2 = getauxval (AT_DCACHEBSIZE); 33 *errnop = errno; 34 35 printf ("AT_DCACHEBSIZE = %" PRIu64 " B\n", cls2); 36 printf ("_dl_cache_line_size = %d B\n", cls1); 37 38 if (cls1 != cls2) 39 { 40 printf ("error: _dl_cache_line_size != AT_DCACHEBSIZE\n"); 41 return 1; 42 } 43 44 return 0; 45 } 46