143 lines
4.5 KiB
C
143 lines
4.5 KiB
C
/****************************************************************************
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* sched/clock/clock_settime.c
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*
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* Copyright (C) 2007, 2009, 2011, 2014 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 <time.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/irq.h>
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#include "clock/clock.h"
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#ifdef CONFIG_CLOCK_TIMEKEEPING
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# include "clock/clock_timekeeping.h"
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: clock_settime
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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_settime(clockid_t clock_id, FAR const struct timespec *tp)
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{
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struct timespec bias;
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irqstate_t flags;
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int ret = OK;
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sinfo("clock_id=%d\n", clock_id);
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DEBUGASSERT(tp != NULL);
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/* CLOCK_REALTIME - POSIX demands this to be present. This is the wall
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* time clock.
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*/
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if (clock_id == CLOCK_REALTIME)
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{
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#ifndef CONFIG_CLOCK_TIMEKEEPING
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/* Interrupts are disabled here so that the in-memory time
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* representation and the RTC setting will be as close as
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* possible.
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*/
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flags = enter_critical_section();
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/* Get the elapsed time since power up (in milliseconds). This is a
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* bias value that we need to use to correct the base time.
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*/
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(void)clock_systimespec(&bias);
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/* Save the new base time. */
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g_basetime.tv_sec = tp->tv_sec;
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g_basetime.tv_nsec = tp->tv_nsec;
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/* Subtract that bias from the basetime so that when the system
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* timer is again added to the base time, the result is the current
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* time relative to basetime.
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*/
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if (g_basetime.tv_nsec < bias.tv_nsec)
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{
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g_basetime.tv_nsec += NSEC_PER_SEC;
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g_basetime.tv_sec--;
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}
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/* Result could be negative seconds */
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g_basetime.tv_nsec -= bias.tv_nsec;
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g_basetime.tv_sec -= bias.tv_sec;
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/* Setup the RTC (lo- or high-res) */
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#ifdef CONFIG_RTC
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if (g_rtc_enabled)
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{
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up_rtc_settime(tp);
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}
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#endif
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leave_critical_section(flags);
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sinfo("basetime=(%ld,%lu) bias=(%ld,%lu)\n",
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(long)g_basetime.tv_sec, (unsigned long)g_basetime.tv_nsec,
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(long)bias.tv_sec, (unsigned long)bias.tv_nsec);
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#else
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ret = clock_timekeeping_set_wall_time(tp);
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#endif
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}
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else
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{
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serr("Returning ERROR\n");
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set_errno(EINVAL);
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ret = ERROR;
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}
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return ret;
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}
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