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46 lines
1.4 KiB
C
46 lines
1.4 KiB
C
/* Test if an executable can read from rtld_global_ro._dl_cache_line_size.
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Copyright (C) 2020-2024 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 <stdio.h>
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#include <stdint.h>
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#include <inttypes.h>
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#include <sys/auxv.h>
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#include <ldsodefs.h>
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#include <errno.h>
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/* errnop is required in order to work around BZ #20802. */
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int
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test_cache (int *errnop)
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{
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int cls1 = GLRO (dl_cache_line_size);
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errno = *errnop;
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uint64_t cls2 = getauxval (AT_DCACHEBSIZE);
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*errnop = errno;
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printf ("AT_DCACHEBSIZE = %" PRIu64 " B\n", cls2);
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printf ("_dl_cache_line_size = %d B\n", cls1);
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if (cls1 != cls2)
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{
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printf ("error: _dl_cache_line_size != AT_DCACHEBSIZE\n");
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return 1;
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}
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return 0;
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}
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