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121 lines
4.3 KiB
121 lines
4.3 KiB
/************************************************************************ |
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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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