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/*********************************************************
* Copyright (C) 2010 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation version 2.1 and no later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the Lesser GNU General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*********************************************************/
/**
* @file slewAdjtime.c
*
* Implementation of slewing using Posix adjtime system call.
*/
#include "timeSync.h"
#include "timeSyncPosix.h"
#include <errno.h>
#include <glib.h>
#include <string.h>
#include <time.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/timex.h>
#include "vm_assert.h"
/*
******************************************************************************
* TimeSync_DisableTimeSlew -- */ /**
*
* Disable time slewing, canceling any pending slew.
*
* @return TRUE on success.
*
******************************************************************************
*/
Bool
TimeSync_DisableTimeSlew(void)
{
struct timeval tx = {0};
int error;
error = adjtime(&tx, NULL);
if (error == -1) {
g_debug("adjtime failed: %s\n", strerror(errno));
return FALSE;
}
return TRUE;
}
/*
******************************************************************************
* TimeSync_Slew -- */ /**
*
* Slew the clock, correcting 'delta' microseconds. timeSyncPeriod is
* ignored by this implementation. Report the amount of the previous
* correction that has not been applied.
*
* @param[in] delta Correction to apply in us.
* @param[in] timeSyncPeriod Time interval in us.
* @param[out] remaining Amount of previous correction not applied.
*
* @return TRUE on success.
*
******************************************************************************
*/
Bool
TimeSync_Slew(int64 delta,
int64 timeSyncPeriod,
int64 *remaining)
{
struct timeval tx;
struct timeval oldTx;
int error;
TimeSyncWriteTimeVal(delta, &tx);
error = adjtime(&tx, &oldTx);
if (error == -1) {
g_debug("adjtime failed: %s\n", strerror(errno));
return FALSE;
}
g_debug("time slew start.\n");
*remaining = (int64)oldTx.tv_sec * US_PER_SEC + (int64)oldTx.tv_usec;
return TRUE;
}
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