94 lines
3.5 KiB
C
94 lines
3.5 KiB
C
/****************************************************************************
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* sched/timer/timer_gettime.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <errno.h>
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#include "clock/clock.h"
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#include "timer/timer.h"
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#ifndef CONFIG_DISABLE_POSIX_TIMERS
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: timer_gettime
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*
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* Description:
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* The timer_gettime() function will store the amount of time until the
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* specified timer, timerid, expires and the reload value of the timer
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* into the space pointed to by the value argument. The it_value member
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* of this structure will contain the amount of time before the timer
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* expires, or zero if the timer is disarmed. This value is returned as
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* the interval until timer expiration, even if the timer was armed with
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* absolute time. The it_interval member of value will contain the reload
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* value last set by timer_settime().
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*
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* Input Parameters:
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* timerid - The pre-thread timer, previously created by the call to
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* timer_create(), whose remaining time count will be returned..
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*
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* Returned Value:
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* If the timer_gettime() succeeds, a value of 0 (OK) will be returned.
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* If an error occurs, the value -1 (ERROR) will be returned, and errno
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* set to indicate the error.
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*
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* EINVAL - The timerid argument does not correspond to an ID returned by
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* timer_create() but not yet deleted by timer_delete().
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*
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* Assumptions/Limitations:
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* Due to the asynchronous operation of this function, the time reported
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* by this function could be significantly more than that actual time
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* remaining on the timer at any time.
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*
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****************************************************************************/
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int timer_gettime(timer_t timerid, FAR struct itimerspec *value)
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{
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FAR struct posix_timer_s *timer = (FAR struct posix_timer_s *)timerid;
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sclock_t ticks;
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if (!timer || !value)
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{
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set_errno(EINVAL);
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return ERROR;
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}
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/* Get the number of ticks before the underlying watchdog expires */
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ticks = wd_gettime(timer->pt_wdog);
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/* Convert that to a struct timespec and return it */
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clock_ticks2time(ticks, &value->it_value);
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clock_ticks2time(timer->pt_delay, &value->it_interval);
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return OK;
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}
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#endif /* CONFIG_DISABLE_POSIX_TIMERS */
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