/**
* @file
*
* @brief Function Arms or Disarms the Timer Identified by timerid
* @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.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <time.h>
#include <errno.h>
#include <rtems/system.h>
#include <rtems/seterr.h>
#include <rtems/score/thread.h>
#include <rtems/score/tod.h>
#include <rtems/posix/time.h>
#include <rtems/posix/ptimer.h>
#include <rtems/posix/timerimpl.h>
int timer_settime(
timer_t timerid,
int flags,
const struct itimerspec *value,
struct itimerspec *ovalue
)
{
POSIX_Timer_Control *ptimer;
Objects_Locations location;
bool activated;
uint32_t initial_period;
struct itimerspec normalize;
if ( !value )
rtems_set_errno_and_return_minus_one( EINVAL );
/*
* First, it verifies if the structure "value" is correct
* if the number of nanoseconds is not correct return EINVAL
*/
if ( !_Timespec_Is_valid( &(value->it_value) ) ) {
rtems_set_errno_and_return_minus_one( EINVAL );
}
if ( !_Timespec_Is_valid( &(value->it_interval) ) ) {
rtems_set_errno_and_return_minus_one( EINVAL );
}
if ( flags != TIMER_ABSTIME && flags != POSIX_TIMER_RELATIVE ) {
rtems_set_errno_and_return_minus_one( EINVAL );
}
normalize = *value;
/* Convert absolute to relative time */
if (flags == TIMER_ABSTIME) {
struct timespec now;
_TOD_Get( &now );
/* Check for seconds in the past */
if ( _Timespec_Greater_than( &now, &normalize.it_value ) )
rtems_set_errno_and_return_minus_one( EINVAL );
_Timespec_Subtract( &now, &normalize.it_value, &normalize.it_value );
}
/* If the function reaches this point, then it will be necessary to do
* something with the structure of times of the timer: to stop, start
* or start it again
*/
ptimer = _POSIX_Timer_Get( timerid, &location );
switch ( location ) {
case OBJECTS_LOCAL:
/* First, it verifies if the timer must be stopped */
if ( normalize.it_value.tv_sec == 0 && normalize.it_value.tv_nsec == 0 ) {
/* Stop the timer */
(void) _Watchdog_Remove( &ptimer->Timer );
/* The old data of the timer are returned */
if ( ovalue )
*ovalue = ptimer->timer_data;
/* The new data are set */
ptimer->timer_data = normalize;
/* Indicates that the timer is created and stopped */
ptimer->state = POSIX_TIMER_STATE_CREATE_STOP;
/* Returns with success */
_Objects_Put( &ptimer->Object );
return 0;
}
/* Convert from seconds and nanoseconds to ticks */
ptimer->ticks = _Timespec_To_ticks( &value->it_interval );
initial_period = _Timespec_To_ticks( &normalize.it_value );
activated = _POSIX_Timer_Insert_helper(
&ptimer->Timer,
initial_period,
ptimer->Object.id,
_POSIX_Timer_TSR,
ptimer
);
if ( !activated ) {
_Objects_Put( &ptimer->Object );
return 0;
}
/*
* The timer has been started and is running. So we return the
* old ones in "ovalue"
*/
if ( ovalue )
*ovalue = ptimer->timer_data;
ptimer->timer_data = normalize;
/* Indicate that the time is running */
ptimer->state = POSIX_TIMER_STATE_CREATE_RUN;
_TOD_Get( &ptimer->time );
_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 );
}