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