152 lines
5.1 KiB
C
152 lines
5.1 KiB
C
/************************************************************************
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* sched/clock_gettime.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 <spudmonkey@racsa.co.cr>
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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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* Function: clock_gettime
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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_gettime(clockid_t clock_id, struct timespec *tp)
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{
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uint32_t msecs;
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uint32_t secs;
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uint32_t nsecs;
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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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*get_errno_ptr() = 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 elapsed time since power up (in milliseconds) biased
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* as appropriate.
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*/
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msecs = MSEC_PER_TICK * (g_system_timer - g_tickbias);
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sdbg("msecs = %d g_tickbias=%d\n",
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(int)msecs, (int)g_tickbias);
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/* Get the elapsed time in seconds and nanoseconds. */
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secs = msecs / MSEC_PER_SEC;
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nsecs = (msecs - (secs * MSEC_PER_SEC)) * NSEC_PER_MSEC;
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sdbg("secs = %d + %d nsecs = %d + %d\n",
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(int)msecs, (int)g_basetime.tv_sec,
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(int)nsecs, (int)g_basetime.tv_nsec);
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/* Add the base time to this. */
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secs += (uint32_t)g_basetime.tv_sec;
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nsecs += (uint32_t)g_basetime.tv_nsec;
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/* Handle carry to seconds. */
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if (nsecs > NSEC_PER_SEC)
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{
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uint32_t dwCarrySecs = nsecs / NSEC_PER_SEC;
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secs += dwCarrySecs;
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nsecs -= (dwCarrySecs * NSEC_PER_SEC);
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}
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/* And return the result to the caller. */
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tp->tv_sec = (time_t)secs;
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tp->tv_nsec = (long)nsecs;
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sdbg("Returning tp=(%d,%d)\n",
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(int)tp->tv_sec, (int)tp->tv_nsec);
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}
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return ret;
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}
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