122 lines
4.3 KiB
C
122 lines
4.3 KiB
C
/************************************************************************
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* sched/clock_getres.c
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*
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* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************/
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/************************************************************************
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* Included Files
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************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <time.h>
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#include <errno.h>
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#include <debug.h>
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#include "clock_internal.h"
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/************************************************************************
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* Definitions
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************************************************************************/
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/************************************************************************
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* Private Type Declarations
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************************************************************************/
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/************************************************************************
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* Private Function Prototypes
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************************************************************************/
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/**********************************************************************
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* Public Constant Data
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**********************************************************************/
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/************************************************************************
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* Public Variables
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************************************************************************/
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/**********************************************************************
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* Private Variables
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**********************************************************************/
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/************************************************************************
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* Private Functions
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************************************************************************/
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/************************************************************************
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* Public Functions
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************************************************************************/
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/************************************************************************
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* Name: clock_getres
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*
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* Description:
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* Clock Functions based on POSIX APIs
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*
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************************************************************************/
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int clock_getres(clockid_t clock_id, struct timespec *res)
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{
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uint32_t time_res;
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int ret = OK;
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sdbg("clock_id=%d\n", clock_id);
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/* Only CLOCK_REALTIME is supported */
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if (clock_id != CLOCK_REALTIME)
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{
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sdbg("Returning ERROR\n");
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set_errno(EINVAL);
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ret = ERROR;
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}
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else
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{
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/* Get the clock resolution in nanoseconds */
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time_res = MSEC_PER_TICK * NSEC_PER_MSEC;
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/* And return this as a timespec. */
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res->tv_sec = 0;
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res->tv_nsec = time_res;
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sdbg("Returning res=(%d,%d) time_res=%d\n",
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(int)res->tv_sec, (int)res->tv_nsec,
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(int)time_res);
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}
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return ret;
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}
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