/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup POSIXAPI
*
* @brief Function Fetches State of POSIX Per-Process Timers
*/
/*
* 14.2.4 Per-Process Timers, P1003.1b-1993, p. 267
*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* 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.
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <time.h>
#include <errno.h>
#include <rtems/posix/timerimpl.h>
#include <rtems/score/todimpl.h>
#include <rtems/score/watchdogimpl.h>
#include <rtems/seterr.h>
#include <rtems/timespec.h>
/*
* - When a timer is initialized, the value of the time in
* that moment is stored.
* - When this function is called, it returns the difference
* between the current time and the initialization time.
*/
int timer_gettime(
timer_t timerid,
struct itimerspec *value
)
{
POSIX_Timer_Control *ptimer;
ISR_lock_Context lock_context;
Per_CPU_Control *cpu;
struct timespec now;
struct timespec expire;
struct timespec result;
if ( !value )
rtems_set_errno_and_return_minus_one( EINVAL );
ptimer = _POSIX_Timer_Get( timerid, &lock_context );
if ( ptimer == NULL ) {
rtems_set_errno_and_return_minus_one( EINVAL );
}
cpu = _POSIX_Timer_Acquire_critical( ptimer, &lock_context );
rtems_timespec_from_ticks( ptimer->Timer.expire, &expire );
if ( ptimer->clock_type == CLOCK_MONOTONIC ) {
_Timecounter_Nanouptime(&now);
} else if (ptimer->clock_type == CLOCK_REALTIME) {
_TOD_Get(&now);
} else {
_POSIX_Timer_Release( cpu, &lock_context );
rtems_set_errno_and_return_minus_one( EINVAL );
}
if ( rtems_timespec_less_than( &now, &expire ) ) {
rtems_timespec_subtract( &now, &expire, &result );
} else {
result.tv_nsec = 0;
result.tv_sec = 0;
}
value->it_value = result;
value->it_interval = ptimer->timer_data.it_interval;
_POSIX_Timer_Release( cpu, &lock_context );
return 0;
}
