109 lines
4.3 KiB
C
109 lines
4.3 KiB
C
/****************************************************************************
|
|
* sched/timer/timer_gettime.c
|
|
*
|
|
* Copyright (C) 2007 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 <errno.h>
|
|
|
|
#include "clock/clock.h"
|
|
#include "timer/timer.h"
|
|
|
|
#ifndef CONFIG_DISABLE_POSIX_TIMERS
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: timer_gettime
|
|
*
|
|
* Description:
|
|
* The timer_gettime() function will store the amount of time until the
|
|
* specified timer, timerid, expires and the reload value of the timer
|
|
* into the space pointed to by the value argument. The it_value member
|
|
* of this structure will contain the amount of time before the timer
|
|
* expires, or zero if the timer is disarmed. This value is returned as
|
|
* the interval until timer expiration, even if the timer was armed with
|
|
* absolute time. The it_interval member of value will contain the reload
|
|
* value last set by timer_settime().
|
|
*
|
|
* Parameters:
|
|
* timerid - The pre-thread timer, previously created by the call to
|
|
* timer_create(), whose remaining time count will be returned..
|
|
*
|
|
* Return Value:
|
|
* If the timer_gettime() succeeds, a value of 0 (OK) will be returned.
|
|
* If an error occurs, the value -1 (ERROR) will be returned, and errno
|
|
* set to indicate the error.
|
|
*
|
|
* EINVAL - The timerid argument does not correspond to an ID returned by
|
|
* timer_create() but not yet deleted by timer_delete().
|
|
*
|
|
* Assumptions/Limitations:
|
|
* Due to the asynchronous operation of this function, the time reported
|
|
* by this function could be significantly more than that actual time
|
|
* remaining on the timer at any time.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int timer_gettime(timer_t timerid, FAR struct itimerspec *value)
|
|
{
|
|
FAR struct posix_timer_s *timer = (FAR struct posix_timer_s *)timerid;
|
|
ssystime_t ticks;
|
|
|
|
if (!timer || !value)
|
|
{
|
|
set_errno(EINVAL);
|
|
return ERROR;
|
|
}
|
|
|
|
/* Get the number of ticks before the underlying watchdog expires */
|
|
|
|
ticks = wd_gettime(timer->pt_wdog);
|
|
|
|
/* Convert that to a struct timespec and return it */
|
|
|
|
(void)clock_ticks2time(ticks, &value->it_value);
|
|
(void)clock_ticks2time(timer->pt_last, &value->it_interval);
|
|
return OK;
|
|
}
|
|
|
|
#endif /* CONFIG_DISABLE_POSIX_TIMERS */
|