116 lines
4.1 KiB
C
116 lines
4.1 KiB
C
/****************************************************************************
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* sched/timer/timer_getitimer.c
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*
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* Copyright (C) 2019 Xiaomi Inc. All rights reserved.
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* Author: Xiang Xiao <xiaoxiang@xiaomi.com>
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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 <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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