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e5ac7bd679
ISO C2X adds a timespec_getres function alongside the C11 timespec_get, with functionality similar to that of POSIX clock_getres (including allowing a NULL pointer to be passed to the function). Implement this function for glibc, similarly to the implementation of timespec_get. This includes a basic test like that of timespec_get, but no documentation in the manual, given that TIME_UTC and timespec_get aren't documented in the manual at all. The handling of 64-bit time follows that in timespec_get; people maintaining patch series for 64-bit time will need to update them accordingly (to export __timespec_getres64, redirect calls in time.h and run the test for _TIME_BITS=64). Tested for x86_64 and x86, and (previous version; only testcase differs) with build-many-glibcs.py.
52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/* Basic tests for timespec_getres.
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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 <time.h>
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#include <support/check.h>
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static int
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do_test (void)
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{
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{
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struct timespec ts;
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TEST_COMPARE (timespec_getres (&ts, 0), 0);
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TEST_COMPARE (timespec_getres (NULL, 0), 0);
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}
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{
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struct timespec ts;
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TEST_COMPARE (timespec_getres (&ts, TIME_UTC), TIME_UTC);
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/* Expect all supported systems to support TIME_UTC with
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resolution better than one second. */
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TEST_VERIFY (ts.tv_sec == 0);
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TEST_VERIFY (ts.tv_nsec > 0);
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TEST_VERIFY (ts.tv_nsec < 1000000000);
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TEST_COMPARE (timespec_getres (NULL, TIME_UTC), TIME_UTC);
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/* Expect the resolution to be the same as that reported for
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CLOCK_REALTIME with clock_getres. */
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struct timespec cts;
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TEST_COMPARE (clock_getres (CLOCK_REALTIME, &cts), 0);
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TEST_COMPARE (ts.tv_sec, cts.tv_sec);
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TEST_COMPARE (ts.tv_nsec, cts.tv_nsec);
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}
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return 0;
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}
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#include <support/test-driver.c>
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