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77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
/* Copyright (C) 2003 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#include "kernel-features.h"
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#ifdef __ASSUME_POSIX_TIMERS
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/* This means the REALTIME and MONOTONIC clock are definitely
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supported in the kernel. */
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# define SYSDEP_GETRES \
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case CLOCK_REALTIME: \
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case CLOCK_MONOTONIC: \
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retval = INLINE_SYSCALL (clock_getres, 2, clock_id, res); \
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break
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#elif defined __NR_clock_getres
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/* Is the syscall known to exist? */
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extern int __libc_missing_posix_timers attribute_hidden;
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/* The REALTIME and MONOTONIC clock might be available. Try the
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syscall first. */
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# define SYSDEP_GETRES \
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case CLOCK_REALTIME: \
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case CLOCK_MONOTONIC: \
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{ \
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int e = EINVAL; \
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\
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if (!__libc_missing_posix_timers) \
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{ \
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INTERNAL_SYSCALL_DECL (err); \
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int r = INTERNAL_SYSCALL (clock_getres, err, 2, clock_id, res); \
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if (!INTERNAL_SYSCALL_ERROR_P (r, err)) \
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{ \
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retval = 0; \
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break; \
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} \
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\
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e = INTERNAL_SYSCALL_ERRNO (r, err); \
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if (e == ENOSYS) \
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{ \
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__libc_missing_posix_timers = 1; \
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e = EINVAL; \
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} \
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} \
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\
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/* Fallback code. */ \
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if (e == EINVAL && clock_id == CLOCK_REALTIME) \
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HANDLE_REALTIME; \
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else \
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__set_errno (e); \
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} \
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break
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#endif
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#ifdef __NR_clock_getres
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/* We handled the REALTIME clock here. */
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# define HANDLED_REALTIME 1
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#endif
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#include <sysdeps/posix/clock_getres.c>
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