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leap.c
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leap.c
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/*
* leap.c
*
* Copyright (C) 2012 Richard Cochran <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any 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
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/timex.h>
#include <time.h>
#include <unistd.h>
#include "lstab.h"
static void print_time_status(FILE *fp, int status)
{
if (status & STA_PLL)
fprintf(fp, "\tSTA_PLL\tenable PLL updates (rw)\n");
if (status & STA_PPSFREQ)
fprintf(fp, "\tSTA_PPSFREQ\tenable PPS freq discipline (rw)\n");
if (status & STA_PPSTIME)
fprintf(fp, "\tSTA_PPSTIME\tenable PPS time discipline (rw)\n");
if (status & STA_FLL)
fprintf(fp, "\tSTA_FLL\tselect frequency-lock mode (rw)\n");
if (status & STA_INS)
fprintf(fp, "\tSTA_INS\tinsert leap (rw)\n");
if (status & STA_DEL)
fprintf(fp, "\tSTA_DEL\tdelete leap (rw)\n");
if (status & STA_UNSYNC)
fprintf(fp, "\tSTA_UNSYNC\tclock unsynchronized (rw)\n");
if (status & STA_FREQHOLD)
fprintf(fp, "\tSTA_FREQHOLD\thold frequency (rw)\n");
if (status & STA_PPSSIGNAL)
fprintf(fp, "\tSTA_PPSSIGNAL\tPPS signal present (ro)\n");
if (status & STA_PPSJITTER)
fprintf(fp, "\tSTA_PPSJITTER\tPPS signal jitter exceeded (ro)\n");
if (status & STA_PPSWANDER)
fprintf(fp, "\tSTA_PPSWANDER\tPPS signal wander exceeded (ro)\n");
if (status & STA_PPSERROR)
fprintf(fp, "\tSTA_PPSERROR\tPPS signal calibration error (ro)\n");
if (status & STA_CLOCKERR)
fprintf(fp, "\tSTA_CLOCKERR\tclock hardware fault (ro)\n");
if (status & STA_NANO)
fprintf(fp, "\tSTA_NANO\tresolution (0 = us, 1 = ns) (ro)\n");
if (status & STA_MODE)
fprintf(fp, "\tSTA_MODE\tmode (0 = PLL, 1 = FLL) (ro)\n");
if (status & STA_CLK)
fprintf(fp, "\tSTA_CLK\tclock source (0 = A, 1 = B) (ro)\n");
}
static int clear_status = 1;
static int delay_usec = 1000000;
static int insert_leap_second = 1;
static int print_all = 0;
static int set_date = 1;
static int set_synchronized = 1;
static int set_tai_offset = 1;
static int verbose_status_bits = 0;
static int leap_test(int index)
{
struct leap_second *ls = lstab_leap_second(index);
struct timespec mono, ts;
FILE *fp = stdout;
struct timex tx;
int tc;
if (clear_status) {
memset(&tx, 0, sizeof(tx));
tx.modes = ADJ_STATUS;
tc = adjtimex(&tx);
if (tc < 0) {
perror("ADJ_STATUS");
return -1;
}
sleep(1);
}
if (set_date) {
ts.tv_sec = ls->epoch.utc - 5;
ts.tv_nsec = 0;
if (clock_settime(CLOCK_REALTIME, &ts)) {
perror("clock_settime");
return -1;
}
}
if (set_synchronized) {
memset(&tx, 0, sizeof(tx));
tx.modes = ADJ_ESTERROR | ADJ_MAXERROR;
tx.esterror = 10;
tx.maxerror = 300000;
tc = adjtimex(&tx);
if (tc < 0) {
perror("ADJ_xxxERROR");
return -1;
}
}
if (clear_status) {
memset(&tx, 0, sizeof(tx));
tx.modes = ADJ_STATUS;
tc = adjtimex(&tx);
if (tc < 0) {
perror("ADJ_STATUS");
return -1;
}
}
if (set_tai_offset) {
memset(&tx, 0, sizeof(tx));
tx.modes = ADJ_TAI;
tx.constant = ls->leap.offset;
tc = adjtimex(&tx);
if (tc < 0) {
perror("ADJ_TAI");
return -1;
}
}
if (insert_leap_second) {
memset(&tx, 0, sizeof(tx));
tx.modes = ADJ_STATUS;
tx.status = STA_INS;
tc = adjtimex(&tx);
if (tc < 0) {
perror("STA_INS");
return -1;
}
}
ts.tv_sec = delay_usec / 1000000;
ts.tv_nsec = (delay_usec % 1000000) * 1000;
while (1) {
memset(&tx, 0, sizeof(tx));
tx.modes = ADJ_NANO;
tc = adjtimex(&tx);
if (tc < 0) {
perror("adjtimex");
return -1;
}
clock_gettime(CLOCK_MONOTONIC, &mono);
if (set_date && tx.time.tv_sec >= ls->epoch.utc + 5) {
break;
}
if (print_all || abs(tx.time.tv_sec - ls->epoch.utc) < 2) {
fprintf(fp, "[%ld.%03ld] %d %c%c %d %ld.%09ld\n",
mono.tv_sec, mono.tv_nsec / 1000000,
tc,
tx.status & STA_INS ? 'I' : '-',
tx.status & STA_DEL ? 'D' : '-',
tx.tai,
tx.time.tv_sec, tx.time.tv_usec);
if (verbose_status_bits)
print_time_status(fp, tx.status);
}
if (delay_usec)
clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL);
}
return 0;
}
static void usage(char *progname)
{
fprintf(stderr,
"\nusage: %s [options]\n\n"
" -f [file] time table of leap seconds\n"
" -h prints this message and exits\n"
" -i leap second table index to use (default 1)\n"
" -p [num] print 'num' entries of the leap second table\n\n"
"leap test options:\n\n"
" -a print all calls to adjtimex (not just epoch +- 1)\n"
" -c do NOT clear all the status bits\n"
" -d do NOT set the historic date and time.\n"
" -l do NOT schedule a leap second insertion.\n"
" -s do NOT pretend to be synchronized.\n"
" -t do NOT set the historic TAI offset.\n"
" -u [num] usec delay between calls to adjtimex (default 1 second)\n"
" -v print the status bits verbosely\n"
"\n",
progname);
}
int main(int argc, char *argv[])
{
char *timetable = NULL, *progname;
int c, index = 1, print_table = 0;
/* Process the command line arguments. */
progname = strrchr(argv[0], '/');
progname = progname ? 1+progname : argv[0];
while (EOF != (c = getopt(argc, argv, "fi:p:" "acdlstu:v" "h"))) {
switch (c) {
case 'f': timetable = optarg; break;
case 'i': index = atoi(optarg); break;
case 'p': print_table = atoi(optarg); break;
/**/
case 'a': print_all = 1; break;
case 'c': clear_status = 0; break;
case 'd': set_date = 0; break;
case 'l': insert_leap_second = 0; break;
case 's': set_synchronized = 0; break;
case 't': set_tai_offset = 0; break;
case 'u': delay_usec = atoi(optarg); break;
case 'v': verbose_status_bits = 1; break;
/**/
case 'h': usage(progname); return 0;
default: usage(progname); return -1;
}
}
lstab_init();
if (timetable && lstab_read(timetable))
return 1;
if (print_table)
lstab_print(stdout, print_table);
leap_test(index);
return 0;
}