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52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/* clock_getres -- Get the resolution of a POSIX clockid_t. Linux version.
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Copyright (C) 2003-2018 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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <errno.h>
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#include <time.h>
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#include "kernel-posix-cpu-timers.h"
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#ifdef HAVE_CLOCK_GETRES_VSYSCALL
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# define HAVE_VSYSCALL
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#endif
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#include <sysdep-vdso.h>
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#define SYSCALL_GETRES \
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retval = INLINE_VSYSCALL (clock_getres, 2, clock_id, res); \
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break
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/* The REALTIME and MONOTONIC clock are definitely supported in the
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kernel. */
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#define SYSDEP_GETRES \
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SYSDEP_GETRES_CPUTIME \
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case CLOCK_REALTIME: \
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case CLOCK_MONOTONIC: \
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case CLOCK_MONOTONIC_RAW: \
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case CLOCK_REALTIME_COARSE: \
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case CLOCK_MONOTONIC_COARSE: \
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SYSCALL_GETRES
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/* We handled the REALTIME clock here. */
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#define HANDLED_REALTIME 1
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#define HANDLED_CPUTIME 1
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#define SYSDEP_GETRES_CPU SYSCALL_GETRES
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#define SYSDEP_GETRES_CPUTIME /* Default catches them too. */
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#include <sysdeps/posix/clock_getres.c>
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