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/*
$Header: /cvs/src/chrony/wrap_adjtimex.c,v 1.9 2002/11/19 21:33:42 richard Exp $
=======================================================================
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Richard P. Curnow 1997-2002
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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 GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
**********************************************************************
=======================================================================
This is a wrapper around the Linux adjtimex system call. It isolates the
inclusion of <linux/adjtimex.h> from the need to include other header files,
many of which conflict with those in <linux/...> on some recent distributions
(as of Jul 2000) using kernels around 2.2.16 onwards.
*/
#ifdef LINUX
#define _LOOSE_KERNEL_NAMES
#include <sys/timex.h> /* Includes definitions from linux/timex.h */
#include <asm/param.h>
#include "wrap_adjtimex.h"
/* From linux/timex.h
*
* The SHIFT_SCALE define establishes the decimal point of the time_phase
* variable which serves as an extension to the low-order bits of the
* system clock variable. The SHIFT_UPDATE define establishes the decimal
* point of the time_offset variable which represents the current offset
* with respect to standard time. The FINENSEC define represents 1 nsec in
* scaled units.
*
* SHIFT_USEC defines the scaling (shift) of the time_freq and
* time_tolerance variables, which represent the current frequency
* offset and maximum frequency tolerance.
*
* FINENSEC is 1 ns in SHIFT_UPDATE units of the time_phase variable.
*/
#define SHIFT_SCALE 22 /* phase scale (shift) */
#define SHIFT_UPDATE (SHIFT_KG + MAXTC) /* time offset scale (shift) */
#define SHIFT_USEC 16 /* frequency offset scale (shift) */
#define FINENSEC (1L << (SHIFT_SCALE - 10)) /* ~1 ns in phase units */
#define MAXPHASE 512000L /* max phase error (us) */
#define MAXFREQ (512L << SHIFT_USEC) /* max frequency error (ppm) */
#define MAXTIME (200L << PPS_AVG) /* max PPS error (jitter) (200 us) */
#define MINSEC 16L /* min interval between updates (s) */
#define MAXSEC 1200L /* max interval between updates (s) */
#define NTP_PHASE_LIMIT (MAXPHASE << 5) /* beyond max. dispersion */
/* This doesn't seem to be in any include files !! */
extern int adjtimex(struct timex *);
int
TMX_SetTick(long tick)
{
struct timex txc;
txc.modes = ADJ_TICK;
txc.tick = tick;
return adjtimex(&txc);
}
int
TMX_ApplyOffset(long *offset)
{
struct timex txc;
int result;
txc.modes = ADJ_OFFSET_SINGLESHOT;
txc.offset = *offset;
result = adjtimex(&txc);
*offset = txc.offset;
return result;
}
int
TMX_SetFrequency(double freq, long tick)
{
struct timex txc;
txc.modes = ADJ_TICK | ADJ_FREQUENCY | ADJ_STATUS;
txc.freq = (long)(freq * (double)(1 << SHIFT_USEC));
txc.tick = tick;
txc.status = STA_UNSYNC; /* Prevent any of the FLL/PLL stuff coming
up */
return adjtimex(&txc);
}
int
TMX_GetFrequency(double *freq)
{
struct timex txc;
int result;
txc.modes = 0; /* pure read */
result = adjtimex(&txc);
*freq = txc.freq / (double)(1 << SHIFT_USEC);
return result;
}
int
TMX_GetOffsetLeft(long *offset)
{
struct timex txc;
int result;
txc.modes = 0; /* pure read */
result = adjtimex(&txc);
*offset = txc.offset;
return result;
}
int
TMX_ReadCurrentParams(struct tmx_params *params)
{
struct timex txc;
int result;
txc.modes = 0; /* pure read */
result = adjtimex(&txc);
params->tick = txc.tick;
params->offset = txc.offset;
params->freq = txc.freq;
params->dfreq = txc.freq / (double)(1 << SHIFT_USEC);
params->maxerror = txc.maxerror;
params->esterror = txc.esterror;
params->sta_pll = (txc.status & STA_PLL);
params->sta_ppsfreq = (txc.status & STA_PPSFREQ);
params->sta_ppstime = (txc.status & STA_PPSTIME);
params->sta_fll = (txc.status & STA_FLL);
params->sta_ins = (txc.status & STA_INS);
params->sta_del = (txc.status & STA_DEL);
params->sta_unsync = (txc.status & STA_UNSYNC);
params->sta_freqhold = (txc.status & STA_FREQHOLD);
params->sta_ppssignal = (txc.status & STA_PPSSIGNAL);
params->sta_ppsjitter = (txc.status & STA_PPSJITTER);
params->sta_ppswander = (txc.status & STA_PPSWANDER);
params->sta_ppserror = (txc.status & STA_PPSERROR);
params->sta_clockerr = (txc.status & STA_CLOCKERR);
params->constant = txc.constant;
params->precision = txc.precision;
params->tolerance = txc.tolerance;
params->ppsfreq = txc.ppsfreq;
params->jitter = txc.jitter;
params->shift = txc.shift;
params->stabil = txc.stabil;
params->jitcnt = txc.jitcnt;
params->calcnt = txc.calcnt;
params->errcnt = txc.errcnt;
params->stbcnt = txc.stbcnt;
return result;
}
#endif
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