880 lines
24 KiB
C
880 lines
24 KiB
C
/* $NetBSD: refclock_datum.c,v 1.4 2006/06/11 19:34:12 kardel Exp $ */
|
|
|
|
/*
|
|
** refclock_datum - clock driver for the Datum Programmable Time Server
|
|
**
|
|
** Important note: This driver assumes that you have termios. If you have
|
|
** a system that does not have termios, you will have to modify this driver.
|
|
**
|
|
** Sorry, I have only tested this driver on SUN and HP platforms.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#if defined(REFCLOCK) && defined(CLOCK_DATUM)
|
|
|
|
/*
|
|
** Include Files
|
|
*/
|
|
|
|
#include "ntpd.h"
|
|
#include "ntp_io.h"
|
|
#include "ntp_refclock.h"
|
|
#include "ntp_unixtime.h"
|
|
#include "ntp_stdlib.h"
|
|
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
|
|
#if defined(HAVE_BSD_TTYS)
|
|
#include <sgtty.h>
|
|
#endif /* HAVE_BSD_TTYS */
|
|
|
|
#if defined(HAVE_SYSV_TTYS)
|
|
#include <termio.h>
|
|
#endif /* HAVE_SYSV_TTYS */
|
|
|
|
#if defined(HAVE_TERMIOS)
|
|
#include <termios.h>
|
|
#endif
|
|
#if defined(STREAM)
|
|
#include <stropts.h>
|
|
#if defined(WWVBCLK)
|
|
#include <sys/clkdefs.h>
|
|
#endif /* WWVBCLK */
|
|
#endif /* STREAM */
|
|
|
|
#include "ntp_stdlib.h"
|
|
|
|
/*
|
|
** This driver supports the Datum Programmable Time System (PTS) clock.
|
|
** The clock works in very straight forward manner. When it receives a
|
|
** time code request (e.g., the ascii string "//k/mn"), it responds with
|
|
** a seven byte BCD time code. This clock only responds with a
|
|
** time code after it first receives the "//k/mn" message. It does not
|
|
** periodically send time codes back at some rate once it is started.
|
|
** the returned time code can be broken down into the following fields.
|
|
**
|
|
** _______________________________
|
|
** Bit Index | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
|
|
** ===============================
|
|
** byte 0: | - - - - | H D |
|
|
** ===============================
|
|
** byte 1: | T D | U D |
|
|
** ===============================
|
|
** byte 2: | - - | T H | U H |
|
|
** ===============================
|
|
** byte 3: | - | T M | U M |
|
|
** ===============================
|
|
** byte 4: | - | T S | U S |
|
|
** ===============================
|
|
** byte 5: | t S | h S |
|
|
** ===============================
|
|
** byte 6: | m S | - - - - |
|
|
** ===============================
|
|
**
|
|
** In the table above:
|
|
**
|
|
** "-" means don't care
|
|
** "H D", "T D", and "U D" means Hundreds, Tens, and Units of Days
|
|
** "T H", and "UH" means Tens and Units of Hours
|
|
** "T M", and "U M" means Tens and Units of Minutes
|
|
** "T S", and "U S" means Tens and Units of Seconds
|
|
** "t S", "h S", and "m S" means tenths, hundredths, and thousandths
|
|
** of seconds
|
|
**
|
|
** The Datum PTS communicates throught the RS232 port on your machine.
|
|
** Right now, it assumes that you have termios. This driver has been tested
|
|
** on SUN and HP workstations. The Datum PTS supports various IRIG and
|
|
** NASA input codes. This driver assumes that the name of the device is
|
|
** /dev/datum. You will need to make a soft link to your RS232 device or
|
|
** create a new driver to use this refclock.
|
|
*/
|
|
|
|
/*
|
|
** Datum PTS defines
|
|
*/
|
|
|
|
/*
|
|
** Note that if GMT is defined, then the Datum PTS must use Greenwich
|
|
** time. Otherwise, this driver allows the Datum PTS to use the current
|
|
** wall clock for its time. It determines the time zone offset by minimizing
|
|
** the error after trying several time zone offsets. If the Datum PTS
|
|
** time is Greenwich time and GMT is not defined, everything should still
|
|
** work since the time zone will be found to be 0. What this really means
|
|
** is that your system time (at least to start with) must be within the
|
|
** correct time by less than +- 30 minutes. The default is for GMT to not
|
|
** defined. If you really want to force GMT without the funny +- 30 minute
|
|
** stuff then you must define (uncomment) GMT below.
|
|
*/
|
|
|
|
/*
|
|
#define GMT
|
|
#define DEBUG_DATUM_PTC
|
|
#define LOG_TIME_ERRORS
|
|
*/
|
|
|
|
|
|
#define PRECISION (-10) /* precision assumed 1/1024 ms */
|
|
#define REFID "DATM" /* reference id */
|
|
#define DATUM_DISPERSION 0 /* fixed dispersion = 0 ms */
|
|
#define DATUM_MAX_ERROR 0.100 /* limits on sigma squared */
|
|
#define DATUM_DEV "/dev/datum" /* device name */
|
|
|
|
#define DATUM_MAX_ERROR2 (DATUM_MAX_ERROR*DATUM_MAX_ERROR)
|
|
|
|
/*
|
|
** The Datum PTS structure
|
|
*/
|
|
|
|
/*
|
|
** I don't use a fixed array of MAXUNITS like everyone else just because
|
|
** I don't like to program that way. Sorry if this bothers anyone. I assume
|
|
** that you can use any id for your unit and I will search for it in a
|
|
** dynamic array of units until I find it. I was worried that users might
|
|
** enter a bad id in their configuration file (larger than MAXUNITS) and
|
|
** besides, it is just cleaner not to have to assume that you have a fixed
|
|
** number of anything in a program.
|
|
*/
|
|
|
|
struct datum_pts_unit {
|
|
struct peer *peer; /* peer used by ntp */
|
|
struct refclockio io; /* io structure used by ntp */
|
|
int PTS_fd; /* file descriptor for PTS */
|
|
u_int unit; /* id for unit */
|
|
u_long timestarted; /* time started */
|
|
l_fp lastrec; /* time tag for the receive time (system) */
|
|
l_fp lastref; /* reference time (Datum time) */
|
|
u_long yearstart; /* the year that this clock started */
|
|
int coderecv; /* number of time codes received */
|
|
int day; /* day */
|
|
int hour; /* hour */
|
|
int minute; /* minutes */
|
|
int second; /* seconds */
|
|
int msec; /* miliseconds */
|
|
int usec; /* miliseconds */
|
|
u_char leap; /* funny leap character code */
|
|
char retbuf[8]; /* returned time from the datum pts */
|
|
char nbytes; /* number of bytes received from datum pts */
|
|
double sigma2; /* average squared error (roughly) */
|
|
int tzoff; /* time zone offest from GMT */
|
|
};
|
|
|
|
/*
|
|
** PTS static constant variables for internal use
|
|
*/
|
|
|
|
static char TIME_REQUEST[6]; /* request message sent to datum for time */
|
|
static int nunits; /* number of active units */
|
|
static struct datum_pts_unit
|
|
**datum_pts_unit; /* dynamic array of datum PTS structures */
|
|
|
|
/*
|
|
** Callback function prototypes that ntpd needs to know about.
|
|
*/
|
|
|
|
static int datum_pts_start P((int, struct peer *));
|
|
static void datum_pts_shutdown P((int, struct peer *));
|
|
static void datum_pts_poll P((int, struct peer *));
|
|
static void datum_pts_control P((int, struct refclockstat *,
|
|
struct refclockstat *, struct peer *));
|
|
static void datum_pts_init P((void));
|
|
static void datum_pts_buginfo P((int, struct refclockbug *, struct peer *));
|
|
|
|
/*
|
|
** This is the call back function structure that ntpd actually uses for
|
|
** this refclock.
|
|
*/
|
|
|
|
struct refclock refclock_datum = {
|
|
datum_pts_start, /* start up a new Datum refclock */
|
|
datum_pts_shutdown, /* shutdown a Datum refclock */
|
|
datum_pts_poll, /* sends out the time request */
|
|
datum_pts_control, /* not used */
|
|
datum_pts_init, /* initialization (called first) */
|
|
datum_pts_buginfo, /* not used */
|
|
NOFLAGS /* we are not setting any special flags */
|
|
};
|
|
|
|
/*
|
|
** The datum_pts_receive callback function is handled differently from the
|
|
** rest. It is passed to the ntpd io data structure. Basically, every
|
|
** 64 seconds, the datum_pts_poll() routine is called. It sends out the time
|
|
** request message to the Datum Programmable Time System. Then, ntpd
|
|
** waits on a select() call to receive data back. The datum_pts_receive()
|
|
** function is called as data comes back. We expect a seven byte time
|
|
** code to be returned but the datum_pts_receive() function may only get
|
|
** a few bytes passed to it at a time. In other words, this routine may
|
|
** get called by the io stuff in ntpd a few times before we get all seven
|
|
** bytes. Once the last byte is received, we process it and then pass the
|
|
** new time measurement to ntpd for updating the system time. For now,
|
|
** there is no 3 state filtering done on the time measurements. The
|
|
** jitter may be a little high but at least for its current use, it is not
|
|
** a problem. We have tried to keep things as simple as possible. This
|
|
** clock should not jitter more than 1 or 2 mseconds at the most once
|
|
** things settle down. It is important to get the right drift calibrated
|
|
** in the ntpd.drift file as well as getting the right tick set up right
|
|
** using tickadj for SUNs. Tickadj is not used for the HP but you need to
|
|
** remember to bring up the adjtime daemon because HP does not support
|
|
** the adjtime() call.
|
|
*/
|
|
|
|
static void datum_pts_receive P((struct recvbuf *));
|
|
|
|
/*......................................................................*/
|
|
/* datum_pts_start - start up the datum PTS. This means open the */
|
|
/* RS232 device and set up the data structure for my unit. */
|
|
/*......................................................................*/
|
|
|
|
static int
|
|
datum_pts_start(
|
|
int unit,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
struct datum_pts_unit **temp_datum_pts_unit;
|
|
struct datum_pts_unit *datum_pts;
|
|
int fd;
|
|
#ifdef HAVE_TERMIOS
|
|
struct termios arg;
|
|
#endif
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("Starting Datum PTS unit %d\n", unit);
|
|
#endif
|
|
|
|
/*
|
|
** Open the Datum PTS device
|
|
*/
|
|
fd = open(DATUM_DEV, O_RDWR);
|
|
|
|
if (fd < 0) {
|
|
msyslog(LOG_ERR, "Datum_PTS: open(\"%s\", O_RDWR) failed: %m", DATUM_DEV);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
** Create the memory for the new unit
|
|
*/
|
|
|
|
temp_datum_pts_unit = (struct datum_pts_unit **)
|
|
malloc((nunits+1)*sizeof(struct datum_pts_unit *));
|
|
if (nunits > 0) memcpy(temp_datum_pts_unit, datum_pts_unit,
|
|
nunits*sizeof(struct datum_pts_unit *));
|
|
free(datum_pts_unit);
|
|
datum_pts_unit = temp_datum_pts_unit;
|
|
datum_pts_unit[nunits] = (struct datum_pts_unit *)
|
|
malloc(sizeof(struct datum_pts_unit));
|
|
datum_pts = datum_pts_unit[nunits];
|
|
|
|
datum_pts->unit = unit; /* set my unit id */
|
|
datum_pts->yearstart = 0; /* initialize the yearstart to 0 */
|
|
datum_pts->sigma2 = 0.0; /* initialize the sigma2 to 0 */
|
|
|
|
datum_pts->PTS_fd = fd;
|
|
|
|
fcntl(datum_pts->PTS_fd, F_SETFL, 0); /* clear the descriptor flags */
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("Opening RS232 port with file descriptor %d\n",
|
|
datum_pts->PTS_fd);
|
|
#endif
|
|
|
|
/*
|
|
** Set up the RS232 terminal device information. Note that we assume that
|
|
** we have termios. This code has only been tested on SUNs and HPs. If your
|
|
** machine does not have termios this driver cannot be initialized. You can change this
|
|
** if you want by editing this source. Please give the changes back to the
|
|
** ntp folks so that it can become part of their regular distribution.
|
|
*/
|
|
|
|
#ifdef HAVE_TERMIOS
|
|
|
|
arg.c_iflag = IGNBRK;
|
|
arg.c_oflag = 0;
|
|
arg.c_cflag = B9600 | CS8 | CREAD | PARENB | CLOCAL;
|
|
arg.c_lflag = 0;
|
|
arg.c_cc[VMIN] = 0; /* start timeout timer right away (not used) */
|
|
arg.c_cc[VTIME] = 30; /* 3 second timout on reads (not used) */
|
|
|
|
tcsetattr(datum_pts->PTS_fd, TCSANOW, &arg);
|
|
|
|
#else
|
|
|
|
msyslog(LOG_ERR, "Datum_PTS: Termios not supported in this driver");
|
|
(void)close(datum_pts->PTS_fd);
|
|
|
|
peer->precision = PRECISION;
|
|
pp->clockdesc = DESCRIPTION;
|
|
memcpy((char *)&pp->refid, REFID, 4);
|
|
|
|
return 0;
|
|
|
|
#endif
|
|
|
|
/*
|
|
** Initialize the ntpd IO structure
|
|
*/
|
|
|
|
datum_pts->peer = peer;
|
|
datum_pts->io.clock_recv = datum_pts_receive;
|
|
datum_pts->io.srcclock = (caddr_t)datum_pts;
|
|
datum_pts->io.datalen = 0;
|
|
datum_pts->io.fd = datum_pts->PTS_fd;
|
|
|
|
if (!io_addclock(&(datum_pts->io))) {
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("Problem adding clock\n");
|
|
#endif
|
|
|
|
msyslog(LOG_ERR, "Datum_PTS: Problem adding clock");
|
|
(void)close(datum_pts->PTS_fd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
** Now add one to the number of units and return a successful code
|
|
*/
|
|
|
|
nunits++;
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
/*......................................................................*/
|
|
/* datum_pts_shutdown - this routine shuts doen the device and */
|
|
/* removes the memory for the unit. */
|
|
/*......................................................................*/
|
|
|
|
static void
|
|
datum_pts_shutdown(
|
|
int unit,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
int i,j;
|
|
struct datum_pts_unit **temp_datum_pts_unit;
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("Shutdown Datum PTS\n");
|
|
#endif
|
|
|
|
msyslog(LOG_ERR, "Datum_PTS: Shutdown Datum PTS");
|
|
|
|
/*
|
|
** First we have to find the right unit (i.e., the one with the same id).
|
|
** We do this by looping through the dynamic array of units intil we find
|
|
** it. Note, that I don't simply use an array with a maximimum number of
|
|
** Datum PTS units. Everything is completely dynamic.
|
|
*/
|
|
|
|
for (i=0; i<nunits; i++) {
|
|
if (datum_pts_unit[i]->unit == unit) {
|
|
|
|
/*
|
|
** We found the unit so close the file descriptor and free up the memory used
|
|
** by the structure.
|
|
*/
|
|
|
|
io_closeclock(&datum_pts_unit[i]->io);
|
|
close(datum_pts_unit[i]->PTS_fd);
|
|
free(datum_pts_unit[i]);
|
|
|
|
/*
|
|
** Now clean up the datum_pts_unit dynamic array so that there are no holes.
|
|
** This may mean moving pointers around, etc., to keep things compact.
|
|
*/
|
|
|
|
if (nunits > 1) {
|
|
|
|
temp_datum_pts_unit = (struct datum_pts_unit **)
|
|
malloc((nunits-1)*sizeof(struct datum_pts_unit *));
|
|
if (i!= 0) memcpy(temp_datum_pts_unit, datum_pts_unit,
|
|
i*sizeof(struct datum_pts_unit *));
|
|
|
|
for (j=i+1; j<nunits; j++) {
|
|
temp_datum_pts_unit[j-1] = datum_pts_unit[j];
|
|
}
|
|
|
|
free(datum_pts_unit);
|
|
datum_pts_unit = temp_datum_pts_unit;
|
|
|
|
}else{
|
|
|
|
free(datum_pts_unit);
|
|
datum_pts_unit = NULL;
|
|
|
|
}
|
|
|
|
return;
|
|
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("Error, could not shut down unit %d\n",unit);
|
|
#endif
|
|
|
|
msyslog(LOG_ERR, "Datum_PTS: Could not shut down Datum PTS unit %d",unit);
|
|
|
|
}
|
|
|
|
/*......................................................................*/
|
|
/* datum_pts_poll - this routine sends out the time request to the */
|
|
/* Datum PTS device. The time will be passed back in the */
|
|
/* datum_pts_receive() routine. */
|
|
/*......................................................................*/
|
|
|
|
static void
|
|
datum_pts_poll(
|
|
int unit,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
int i;
|
|
int unit_index;
|
|
int error_code;
|
|
struct datum_pts_unit *datum_pts;
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("Poll Datum PTS\n");
|
|
#endif
|
|
|
|
/*
|
|
** Find the right unit and send out a time request once it is found.
|
|
*/
|
|
|
|
unit_index = -1;
|
|
for (i=0; i<nunits; i++) {
|
|
if (datum_pts_unit[i]->unit == unit) {
|
|
unit_index = i;
|
|
datum_pts = datum_pts_unit[i];
|
|
error_code = write(datum_pts->PTS_fd, TIME_REQUEST, 6);
|
|
if (error_code != 6) perror("TIME_REQUEST");
|
|
datum_pts->nbytes = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Print out an error message if we could not find the right unit.
|
|
*/
|
|
|
|
if (unit_index == -1) {
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("Error, could not poll unit %d\n",unit);
|
|
#endif
|
|
|
|
msyslog(LOG_ERR, "Datum_PTS: Could not poll unit %d",unit);
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
/*......................................................................*/
|
|
/* datum_pts_control - not used */
|
|
/*......................................................................*/
|
|
|
|
static void
|
|
datum_pts_control(
|
|
int unit,
|
|
struct refclockstat *in,
|
|
struct refclockstat *out,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("Control Datum PTS\n");
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
/*......................................................................*/
|
|
/* datum_pts_init - initializes things for all possible Datum */
|
|
/* time code generators that might be used. In practice, this is */
|
|
/* only called once at the beginning before anything else is */
|
|
/* called. */
|
|
/*......................................................................*/
|
|
|
|
static void
|
|
datum_pts_init(void)
|
|
{
|
|
|
|
/* */
|
|
/*...... open up the log file if we are debugging ......................*/
|
|
/* */
|
|
|
|
/*
|
|
** Open up the log file if we are debugging. For now, send data out to the
|
|
** screen (stdout).
|
|
*/
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("Init Datum PTS\n");
|
|
#endif
|
|
|
|
/*
|
|
** Initialize the time request command string. This is the only message
|
|
** that we ever have to send to the Datum PTS (although others are defined).
|
|
*/
|
|
|
|
memcpy(TIME_REQUEST, "//k/mn",6);
|
|
|
|
/*
|
|
** Initialize the number of units to 0 and set the dynamic array of units to
|
|
** NULL since there are no units defined yet.
|
|
*/
|
|
|
|
datum_pts_unit = NULL;
|
|
nunits = 0;
|
|
|
|
}
|
|
|
|
|
|
/*......................................................................*/
|
|
/* datum_pts_buginfo - not used */
|
|
/*......................................................................*/
|
|
|
|
static void
|
|
datum_pts_buginfo(
|
|
int unit,
|
|
register struct refclockbug *bug,
|
|
register struct peer *peer
|
|
)
|
|
{
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("Buginfo Datum PTS\n");
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
/*......................................................................*/
|
|
/* datum_pts_receive - receive the time buffer that was read in */
|
|
/* by the ntpd io handling routines. When 7 bytes have been */
|
|
/* received (it may take several tries before all 7 bytes are */
|
|
/* received), then the time code must be unpacked and sent to */
|
|
/* the ntpd clock_receive() routine which causes the systems */
|
|
/* clock to be updated (several layers down). */
|
|
/*......................................................................*/
|
|
|
|
static void
|
|
datum_pts_receive(
|
|
struct recvbuf *rbufp
|
|
)
|
|
{
|
|
int i;
|
|
l_fp tstmp;
|
|
struct datum_pts_unit *datum_pts;
|
|
char *dpt;
|
|
int dpend;
|
|
int tzoff;
|
|
int timerr;
|
|
double ftimerr, abserr;
|
|
#ifdef DEBUG_DATUM_PTC
|
|
double dispersion;
|
|
#endif
|
|
int goodtime;
|
|
/*double doffset;*/
|
|
|
|
/*
|
|
** Get the time code (maybe partial) message out of the rbufp buffer.
|
|
*/
|
|
|
|
datum_pts = (struct datum_pts_unit *)rbufp->recv_srcclock;
|
|
dpt = (char *)&rbufp->recv_space;
|
|
dpend = rbufp->recv_length;
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("Receive Datum PTS: %d bytes\n", dpend);
|
|
#endif
|
|
|
|
/* */
|
|
/*...... save the ntp system time when the first byte is received ......*/
|
|
/* */
|
|
|
|
/*
|
|
** Save the ntp system time when the first byte is received. Note that
|
|
** because it may take several calls to this routine before all seven
|
|
** bytes of our return message are finally received by the io handlers in
|
|
** ntpd, we really do want to use the time tag when the first byte is
|
|
** received to reduce the jitter.
|
|
*/
|
|
|
|
if (datum_pts->nbytes == 0) {
|
|
datum_pts->lastrec = rbufp->recv_time;
|
|
}
|
|
|
|
/*
|
|
** Increment our count to the number of bytes received so far. Return if we
|
|
** haven't gotten all seven bytes yet.
|
|
*/
|
|
|
|
for (i=0; i<dpend; i++) {
|
|
datum_pts->retbuf[datum_pts->nbytes+i] = dpt[i];
|
|
}
|
|
|
|
datum_pts->nbytes += dpend;
|
|
|
|
if (datum_pts->nbytes != 7) {
|
|
return;
|
|
}
|
|
|
|
/*
|
|
** Convert the seven bytes received in our time buffer to day, hour, minute,
|
|
** second, and msecond values. The usec value is not used for anything
|
|
** currently. It is just the fractional part of the time stored in units
|
|
** of microseconds.
|
|
*/
|
|
|
|
datum_pts->day = 100*(datum_pts->retbuf[0] & 0x0f) +
|
|
10*((datum_pts->retbuf[1] & 0xf0)>>4) +
|
|
(datum_pts->retbuf[1] & 0x0f);
|
|
|
|
datum_pts->hour = 10*((datum_pts->retbuf[2] & 0x30)>>4) +
|
|
(datum_pts->retbuf[2] & 0x0f);
|
|
|
|
datum_pts->minute = 10*((datum_pts->retbuf[3] & 0x70)>>4) +
|
|
(datum_pts->retbuf[3] & 0x0f);
|
|
|
|
datum_pts->second = 10*((datum_pts->retbuf[4] & 0x70)>>4) +
|
|
(datum_pts->retbuf[4] & 0x0f);
|
|
|
|
datum_pts->msec = 100*((datum_pts->retbuf[5] & 0xf0) >> 4) +
|
|
10*(datum_pts->retbuf[5] & 0x0f) +
|
|
((datum_pts->retbuf[6] & 0xf0)>>4);
|
|
|
|
datum_pts->usec = 1000*datum_pts->msec;
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("day %d, hour %d, minute %d, second %d, msec %d\n",
|
|
datum_pts->day,
|
|
datum_pts->hour,
|
|
datum_pts->minute,
|
|
datum_pts->second,
|
|
datum_pts->msec);
|
|
#endif
|
|
|
|
/*
|
|
** Get the GMT time zone offset. Note that GMT should be zero if the Datum
|
|
** reference time is using GMT as its time base. Otherwise we have to
|
|
** determine the offset if the Datum PTS is using time of day as its time
|
|
** base.
|
|
*/
|
|
|
|
goodtime = 0; /* We are not sure about the time and offset yet */
|
|
|
|
#ifdef GMT
|
|
|
|
/*
|
|
** This is the case where the Datum PTS is using GMT so there is no time
|
|
** zone offset.
|
|
*/
|
|
|
|
tzoff = 0; /* set time zone offset to 0 */
|
|
|
|
#else
|
|
|
|
/*
|
|
** This is the case where the Datum PTS is using regular time of day for its
|
|
** time so we must compute the time zone offset. The way we do it is kind of
|
|
** funny but it works. We loop through different time zones (0 to 24) and
|
|
** pick the one that gives the smallest error (+- one half hour). The time
|
|
** zone offset is stored in the datum_pts structure for future use. Normally,
|
|
** the clocktime() routine is only called once (unless the time zone offset
|
|
** changes due to daylight savings) since the goodtime flag is set when a
|
|
** good time is found (with a good offset). Note that even if the Datum
|
|
** PTS is using GMT, this mechanism will still work since it should come up
|
|
** with a value for tzoff = 0 (assuming that your system clock is within
|
|
** a half hour of the Datum time (even with time zone differences).
|
|
*/
|
|
|
|
for (tzoff=0; tzoff<24; tzoff++) {
|
|
if (clocktime( datum_pts->day,
|
|
datum_pts->hour,
|
|
datum_pts->minute,
|
|
datum_pts->second,
|
|
(tzoff + datum_pts->tzoff) % 24,
|
|
datum_pts->lastrec.l_ui,
|
|
&datum_pts->yearstart,
|
|
&datum_pts->lastref.l_ui) ) {
|
|
|
|
datum_pts->lastref.l_uf = 0;
|
|
error = datum_pts->lastref.l_ui - datum_pts->lastrec.l_ui;
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
printf("Time Zone (clocktime method) = %d, error = %d\n", tzoff, error);
|
|
#endif
|
|
|
|
if ((error < 1799) && (error > -1799)) {
|
|
tzoff = (tzoff + datum_pts->tzoff) % 24;
|
|
datum_pts->tzoff = tzoff;
|
|
goodtime = 1;
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
printf("Time Zone found (clocktime method) = %d\n",tzoff);
|
|
#endif
|
|
|
|
break;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
/*
|
|
** Make sure that we have a good time from the Datum PTS. Clocktime() also
|
|
** sets yearstart and lastref.l_ui. We will have to set astref.l_uf (i.e.,
|
|
** the fraction of a second) stuff later.
|
|
*/
|
|
|
|
if (!goodtime) {
|
|
|
|
if (!clocktime( datum_pts->day,
|
|
datum_pts->hour,
|
|
datum_pts->minute,
|
|
datum_pts->second,
|
|
tzoff,
|
|
datum_pts->lastrec.l_ui,
|
|
&datum_pts->yearstart,
|
|
&datum_pts->lastref.l_ui) ) {
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
{
|
|
printf("Error: bad clocktime\n");
|
|
printf("GMT %d, lastrec %d, yearstart %d, lastref %d\n",
|
|
tzoff,
|
|
datum_pts->lastrec.l_ui,
|
|
datum_pts->yearstart,
|
|
datum_pts->lastref.l_ui);
|
|
}
|
|
#endif
|
|
|
|
msyslog(LOG_ERR, "Datum_PTS: Bad clocktime");
|
|
|
|
return;
|
|
|
|
}else{
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("Good clocktime\n");
|
|
#endif
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
** We have datum_pts->lastref.l_ui set (which is the integer part of the
|
|
** time. Now set the microseconds field.
|
|
*/
|
|
|
|
TVUTOTSF(datum_pts->usec, datum_pts->lastref.l_uf);
|
|
|
|
/*
|
|
** Compute the time correction as the difference between the reference
|
|
** time (i.e., the Datum time) minus the receive time (system time).
|
|
*/
|
|
|
|
tstmp = datum_pts->lastref; /* tstmp is the datum ntp time */
|
|
L_SUB(&tstmp, &datum_pts->lastrec); /* tstmp is now the correction */
|
|
datum_pts->coderecv++; /* increment a counter */
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
dispersion = DATUM_DISPERSION; /* set the dispersion to 0 */
|
|
ftimerr = dispersion;
|
|
ftimerr /= (1024.0 * 64.0);
|
|
if (debug)
|
|
printf("dispersion = %d, %f\n", dispersion, ftimerr);
|
|
#endif
|
|
|
|
/*
|
|
** Pass the new time to ntpd through the refclock_receive function. Note
|
|
** that we are not trying to make any corrections due to the time it takes
|
|
** for the Datum PTS to send the message back. I am (erroneously) assuming
|
|
** that the time for the Datum PTS to send the time back to us is negligable.
|
|
** I suspect that this time delay may be as much as 15 ms or so (but probably
|
|
** less). For our needs at JPL, this kind of error is ok so it is not
|
|
** necessary to use fudge factors in the ntp.conf file. Maybe later we will.
|
|
*/
|
|
/*LFPTOD(&tstmp, doffset);*/
|
|
datum_pts->lastref = datum_pts->lastrec;
|
|
refclock_receive(datum_pts->peer);
|
|
|
|
/*
|
|
** Compute sigma squared (not used currently). Maybe later, this could be
|
|
** used for the dispersion estimate. The problem is that ntpd does not link
|
|
** in the math library so sqrt() is not available. Anyway, this is useful
|
|
** for debugging. Maybe later I will just use absolute values for the time
|
|
** error to come up with my dispersion estimate. Anyway, for now my dispersion
|
|
** is set to 0.
|
|
*/
|
|
|
|
timerr = tstmp.l_ui<<20;
|
|
timerr |= (tstmp.l_uf>>12) & 0x000fffff;
|
|
ftimerr = timerr;
|
|
ftimerr /= 1024*1024;
|
|
abserr = ftimerr;
|
|
if (ftimerr < 0.0) abserr = -ftimerr;
|
|
|
|
if (datum_pts->sigma2 == 0.0) {
|
|
if (abserr < DATUM_MAX_ERROR) {
|
|
datum_pts->sigma2 = abserr*abserr;
|
|
}else{
|
|
datum_pts->sigma2 = DATUM_MAX_ERROR2;
|
|
}
|
|
}else{
|
|
if (abserr < DATUM_MAX_ERROR) {
|
|
datum_pts->sigma2 = 0.95*datum_pts->sigma2 + 0.05*abserr*abserr;
|
|
}else{
|
|
datum_pts->sigma2 = 0.95*datum_pts->sigma2 + 0.05*DATUM_MAX_ERROR2;
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_DATUM_PTC
|
|
if (debug)
|
|
printf("Time error = %f seconds\n", ftimerr);
|
|
#endif
|
|
|
|
#if defined(DEBUG_DATUM_PTC) || defined(LOG_TIME_ERRORS)
|
|
if (debug)
|
|
printf("PTS: day %d, hour %d, minute %d, second %d, msec %d, Time Error %f\n",
|
|
datum_pts->day,
|
|
datum_pts->hour,
|
|
datum_pts->minute,
|
|
datum_pts->second,
|
|
datum_pts->msec,
|
|
ftimerr);
|
|
#endif
|
|
|
|
}
|
|
#else
|
|
int refclock_datum_bs;
|
|
#endif /* REFCLOCK */
|