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58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/* Check if stat supports nanosecond resolution.
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Copyright (C) 2021 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 <errno.h>
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#include <fcntl.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/timespec.h>
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#include <stdbool.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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bool
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support_stat_nanoseconds (const char *path)
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{
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bool support = true;
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#ifdef __linux__
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/* Obtain the original timestamp to restore at the end. */
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struct stat ost;
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TEST_VERIFY_EXIT (stat (path, &ost) == 0);
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const struct timespec tsp[] = { { 0, TIMESPEC_HZ - 1 },
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{ 0, TIMESPEC_HZ / 2 } };
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TEST_VERIFY_EXIT (utimensat (AT_FDCWD, path, tsp, 0) == 0);
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struct stat st;
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TEST_VERIFY_EXIT (stat (path, &st) == 0);
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support = st.st_atim.tv_nsec == tsp[0].tv_nsec
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&& st.st_mtim.tv_nsec == tsp[1].tv_nsec;
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/* Reset to original timestamps. */
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const struct timespec otsp[] =
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{
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{ ost.st_atim.tv_sec, ost.st_atim.tv_nsec },
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{ ost.st_mtim.tv_sec, ost.st_mtim.tv_nsec },
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};
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TEST_VERIFY_EXIT (utimensat (AT_FDCWD, path, otsp, 0) == 0);
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#endif
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return support;
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}
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