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/************************************************************
* clock_getres.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
************************************************************/
/************************************************************
* Included Files
************************************************************/
#include <sys/types.h>
#include <time.h>
#include <errno.h>
#include <debug.h>
#include "clock_internal.h"
/************************************************************
* Definitions
************************************************************/
/************************************************************
* Private Type Declarations
************************************************************/
/************************************************************
* Private Function Prototypes
************************************************************/
/**********************************************************
* Public Constant Data
**********************************************************/
/************************************************************
* Public Variables
************************************************************/
/**********************************************************
* Private Variables
**********************************************************/
/************************************************************
* Private Functions
************************************************************/
/************************************************************
* Public Functions
************************************************************/
/************************************************************
* Function: clock_getres
*
* Description:
* Clock Functions based on POSIX APIs
*
************************************************************/
int clock_getres(clockid_t clock_id, struct timespec *res)
{
uint32 time_res;
int ret = OK;
sdbg("clock_id=%d\n", clock_id);
/* Only CLOCK_REALTIME is supported */
if (clock_id != CLOCK_REALTIME)
{
sdbg("Returning ERROR\n");
*get_errno_ptr() = EINVAL;
ret = ERROR;
}
else
{
/* Get the clock resolution in nanoseconds */
time_res = MSEC_PER_TICK * NSEC_PER_MSEC;
/* And return this as a timespec. */
res->tv_sec = 0;
res->tv_nsec = time_res;
sdbg("Returning res=(%d,%d) time_res=%d\n",
(int)res->tv_sec, (int)res->tv_nsec,
(int)time_res);
}
return ret;
}
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