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/**
* @file
*
* @brief Adjust the Time to Synchronize the System Clock
* @ingroup POSIXAPI
*/
/*
* COPYRIGHT (c) 1989-2014.
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#define _BSD_SOURCE
#include <time.h>
#include <sys/time.h>
#include <errno.h>
#include <rtems/score/timespec.h>
#include <rtems/score/threaddispatch.h>
#include <rtems/score/todimpl.h>
#include <rtems/config.h>
#include <rtems/seterr.h>
/**
* This method was initially added as part of porting NTP to RTEMS.
* It is a BSD compatability function and now is available on
* GNU/Linux.
*
* At one point there was a static variable named adjustment
* used by this implementation. I don't see any reason for it
* to be here based upon the GNU/Linux documentation.
*/
int adjtime(
const struct timeval *delta,
struct timeval *olddelta
)
{
struct timespec delta_as_timespec;
/*
* Simple validations
*/
if ( !delta )
rtems_set_errno_and_return_minus_one( EINVAL );
if ( delta->tv_usec >= TOD_MICROSECONDS_PER_SECOND )
rtems_set_errno_and_return_minus_one( EINVAL );
/*
* An adjustment of zero is pretty easy.
*/
if ( delta->tv_sec == 0 && delta->tv_usec == 0 )
return 0;
/*
* Currently, RTEMS does the adjustment in one movement so there
* is no way an adjustment was currently underway.
*
* Given interest, requirements, and sponsorship, a future
* enhancement would be to adjust the time in smaller increments
* at each clock tick. Until then, there is no outstanding
* adjustment.
*/
if ( olddelta ) {
olddelta->tv_sec = 0;
olddelta->tv_usec = 0;
}
/*
* convert delta timeval to timespec
*/
delta_as_timespec.tv_sec = delta->tv_sec;
delta_as_timespec.tv_nsec = delta->tv_usec * 1000;
/*
* Now apply the adjustment
*/
_TOD_Adjust( &delta_as_timespec );
return 0;
}
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