blob: 2a810ef42d8ed01fe107e3192e10eb7c1514f521 (
plain) (
tree)
|
|
/**
* @file
*
* @brief Function Fetches State of POSIX Per-Process Timers
* @ingroup POSIXAPI
*/
/*
* 14.2.4 Per-Process Timers, P1003.1b-1993, p. 267
*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if 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>
/*
* - 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;
Objects_Locations location;
struct timespec current_time;
Watchdog_Interval left;
if ( !value )
rtems_set_errno_and_return_minus_one( EINVAL );
/* Reads the current time */
_TOD_Get( ¤t_time );
ptimer = _POSIX_Timer_Get( timerid, &location );
switch ( location ) {
case OBJECTS_LOCAL:
/* Calculates the time left before the timer finishes */
left =
(ptimer->Timer.start_time + ptimer->Timer.initial) - /* expire */
_Watchdog_Ticks_since_boot; /* now */
_Timespec_From_ticks( left, &value->it_value );
value->it_interval = ptimer->timer_data.it_interval;
_Objects_Put( &ptimer->Object );
return 0;
#if defined(RTEMS_MULTIPROCESSING)
case OBJECTS_REMOTE:
#endif
case OBJECTS_ERROR:
break;
}
rtems_set_errno_and_return_minus_one( EINVAL );
}
|