101 lines
3.3 KiB
C
101 lines
3.3 KiB
C
/****************************************************************************
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* sched/timer/timer_getitimer.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 <errno.h>
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#include <time.h>
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#include <sys/time.h>
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#include "sched/sched.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: getitimer
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*
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* Description:
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* The getitimer() function will store the amount of time until the
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* specified timer, which, 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. The it_interval member of value
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* will contain the reload value last set by setitime().
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*
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* Input Parameters:
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* which - The predefined timer id
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* value - The current timer value
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*
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* Returned Value:
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* If the getitimer() 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 which argument does not correspond to an predefined ID.
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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 getitimer(int which, FAR struct itimerval *value)
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{
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FAR struct tcb_s *rtcb = this_task();
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struct itimerspec spec =
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{
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{0, 0},
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{0, 0}
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};
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int ret = OK;
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if (which != ITIMER_REAL || !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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if (rtcb->group->itimer)
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{
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ret = timer_gettime(rtcb->group->itimer, &spec);
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}
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if (ret == OK)
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{
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TIMESPEC_TO_TIMEVAL(&value->it_value, &spec.it_value);
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TIMESPEC_TO_TIMEVAL(&value->it_interval, &spec.it_interval);
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}
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return ret;
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}
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#endif /* CONFIG_DISABLE_POSIX_TIMERS */
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