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