aboutsummaryrefslogtreecommitdiff
path: root/contrib/ntp/parseutil/dcfd.c
diff options
context:
space:
mode:
Diffstat (limited to 'contrib/ntp/parseutil/dcfd.c')
-rw-r--r--contrib/ntp/parseutil/dcfd.c1850
1 files changed, 1850 insertions, 0 deletions
diff --git a/contrib/ntp/parseutil/dcfd.c b/contrib/ntp/parseutil/dcfd.c
new file mode 100644
index 000000000000..7d223de3cbbd
--- /dev/null
+++ b/contrib/ntp/parseutil/dcfd.c
@@ -0,0 +1,1850 @@
+/*
+ * /src/NTP/ntp-4/parseutil/dcfd.c,v 4.9 1999/02/28 13:06:27 kardel RELEASE_19990228_A
+ *
+ * dcfd.c,v 4.9 1999/02/28 13:06:27 kardel RELEASE_19990228_A
+ *
+ * DCF77 100/200ms pulse synchronisation daemon program (via 50Baud serial line)
+ *
+ * Features:
+ * DCF77 decoding
+ * simple NTP loopfilter logic for local clock
+ * interactive display for debugging
+ *
+ * Lacks:
+ * Leap second handling (at that level you should switch to NTP Version 4 - really!)
+ *
+ * Copyright (C) 1995-1999 by Frank Kardel <kardel@acm.org>
+ * Copyright (C) 1993-1994 by Frank Kardel
+ * Friedrich-Alexander Universität Erlangen-Nürnberg, Germany
+ *
+ * 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.
+ *
+ * This program may not be sold or used for profit without prior
+ * written consent of the author.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <unistd.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <signal.h>
+#include <syslog.h>
+#include <time.h>
+
+/*
+ * NTP compilation environment
+ */
+#include "ntp_stdlib.h"
+#include "ntpd.h" /* indirectly include ntp.h to get YEAR_PIVOT Y2KFixes */
+
+/*
+ * select which terminal handling to use (currently only SysV variants)
+ */
+#if defined(HAVE_TERMIOS_H) || defined(STREAM)
+#include <termios.h>
+#define TTY_GETATTR(_FD_, _ARG_) tcgetattr((_FD_), (_ARG_))
+#define TTY_SETATTR(_FD_, _ARG_) tcsetattr((_FD_), TCSANOW, (_ARG_))
+#else /* not HAVE_TERMIOS_H || STREAM */
+# if defined(HAVE_TERMIO_H) || defined(HAVE_SYSV_TTYS)
+# include <termio.h>
+# define TTY_GETATTR(_FD_, _ARG_) ioctl((_FD_), TCGETA, (_ARG_))
+# define TTY_SETATTR(_FD_, _ARG_) ioctl((_FD_), TCSETAW, (_ARG_))
+# endif/* HAVE_TERMIO_H || HAVE_SYSV_TTYS */
+#endif /* not HAVE_TERMIOS_H || STREAM */
+
+
+#ifndef TTY_GETATTR
+#include "Bletch: MUST DEFINE ONE OF 'HAVE_TERMIOS_H' or 'HAVE_TERMIO_H'"
+#endif
+
+#ifndef days_per_year
+#define days_per_year(_x_) (((_x_) % 4) ? 365 : (((_x_) % 400) ? 365 : 366))
+#endif
+
+#define timernormalize(_a_) \
+ if ((_a_)->tv_usec >= 1000000) \
+ { \
+ (_a_)->tv_sec += (_a_)->tv_usec / 1000000; \
+ (_a_)->tv_usec = (_a_)->tv_usec % 1000000; \
+ } \
+ if ((_a_)->tv_usec < 0) \
+ { \
+ (_a_)->tv_sec -= 1 + (-(_a_)->tv_usec / 1000000); \
+ (_a_)->tv_usec = 999999 - (-(_a_)->tv_usec - 1); \
+ }
+
+#ifdef timeradd
+#undef timeradd
+#endif
+#define timeradd(_a_, _b_) \
+ (_a_)->tv_sec += (_b_)->tv_sec; \
+ (_a_)->tv_usec += (_b_)->tv_usec; \
+ timernormalize((_a_))
+
+#ifdef timersub
+#undef timersub
+#endif
+#define timersub(_a_, _b_) \
+ (_a_)->tv_sec -= (_b_)->tv_sec; \
+ (_a_)->tv_usec -= (_b_)->tv_usec; \
+ timernormalize((_a_))
+
+/*
+ * debug macros
+ */
+#define PRINTF if (interactive) printf
+#define LPRINTF if (interactive && loop_filter_debug) printf
+
+#ifdef DEBUG
+#define dprintf(_x_) LPRINTF _x_
+#else
+#define dprintf(_x_)
+#endif
+
+ extern int errno;
+
+/*
+ * display received data (avoids also detaching from tty)
+ */
+static int interactive = 0;
+
+/*
+ * display loopfilter (clock control) variables
+ */
+static int loop_filter_debug = 0;
+
+/*
+ * do not set/adjust system time
+ */
+static int no_set = 0;
+
+/*
+ * time that passes between start of DCF impulse and time stamping (fine
+ * adjustment) in microseconds (receiver/OS dependent)
+ */
+#define DEFAULT_DELAY 230000 /* rough estimate */
+
+/*
+ * The two states we can be in - eithe we receive nothing
+ * usable or we have the correct time
+ */
+#define NO_SYNC 0x01
+#define SYNC 0x02
+
+static int sync_state = NO_SYNC;
+static time_t last_sync;
+
+static unsigned long ticks = 0;
+
+static char pat[] = "-\\|/";
+
+#define LINES (24-2) /* error lines after which the two headlines are repeated */
+
+#define MAX_UNSYNC (10*60) /* allow synchronisation loss for 10 minutes */
+#define NOTICE_INTERVAL (20*60) /* mention missing synchronisation every 20 minutes */
+
+/*
+ * clock adjustment PLL - see NTP protocol spec (RFC1305) for details
+ */
+
+#define USECSCALE 10
+#define TIMECONSTANT 2
+#define ADJINTERVAL 0
+#define FREQ_WEIGHT 18
+#define PHASE_WEIGHT 7
+#define MAX_DRIFT 0x3FFFFFFF
+
+#define R_SHIFT(_X_, _Y_) (((_X_) < 0) ? -(-(_X_) >> (_Y_)) : ((_X_) >> (_Y_)))
+
+static struct timeval max_adj_offset = { 0, 128000 };
+
+static long clock_adjust = 0; /* current adjustment value (usec * 2^USECSCALE) */
+static long accum_drift = 0; /* accumulated drift value (usec / ADJINTERVAL) */
+static long adjustments = 0;
+static char skip_adjust = 1; /* discard first adjustment (bad samples) */
+
+/*
+ * DCF77 state flags
+ */
+#define DCFB_ANNOUNCE 0x0001 /* switch time zone warning (DST switch) */
+#define DCFB_DST 0x0002 /* DST in effect */
+#define DCFB_LEAP 0x0004 /* LEAP warning (1 hour prior to occurence) */
+#define DCFB_ALTERNATE 0x0008 /* alternate antenna used */
+
+struct clocktime /* clock time broken up from time code */
+{
+ long wday; /* Day of week: 1: Monday - 7: Sunday */
+ long day;
+ long month;
+ long year;
+ long hour;
+ long minute;
+ long second;
+ long usecond;
+ long utcoffset; /* in minutes */
+ long flags; /* current clock status (DCF77 state flags) */
+};
+
+typedef struct clocktime clocktime_t;
+
+/*
+ * (usually) quick constant multiplications
+ */
+#define TIMES10(_X_) (((_X_) << 3) + ((_X_) << 1)) /* *8 + *2 */
+#define TIMES24(_X_) (((_X_) << 4) + ((_X_) << 3)) /* *16 + *8 */
+#define TIMES60(_X_) ((((_X_) << 4) - (_X_)) << 2) /* *(16 - 1) *4 */
+/*
+ * generic l_abs() function
+ */
+#define l_abs(_x_) (((_x_) < 0) ? -(_x_) : (_x_))
+
+/*
+ * conversion related return/error codes
+ */
+#define CVT_MASK 0x0000000F /* conversion exit code */
+#define CVT_NONE 0x00000001 /* format not applicable */
+#define CVT_FAIL 0x00000002 /* conversion failed - error code returned */
+#define CVT_OK 0x00000004 /* conversion succeeded */
+#define CVT_BADFMT 0x00000010 /* general format error - (unparsable) */
+#define CVT_BADDATE 0x00000020 /* invalid date */
+#define CVT_BADTIME 0x00000040 /* invalid time */
+
+/*
+ * DCF77 raw time code
+ *
+ * From "Zur Zeit", Physikalisch-Technische Bundesanstalt (PTB), Braunschweig
+ * und Berlin, Maerz 1989
+ *
+ * Timecode transmission:
+ * AM:
+ * time marks are send every second except for the second before the
+ * next minute mark
+ * time marks consist of a reduction of transmitter power to 25%
+ * of the nominal level
+ * the falling edge is the time indication (on time)
+ * time marks of a 100ms duration constitute a logical 0
+ * time marks of a 200ms duration constitute a logical 1
+ * FM:
+ * see the spec. (basically a (non-)inverted psuedo random phase shift)
+ *
+ * Encoding:
+ * Second Contents
+ * 0 - 10 AM: free, FM: 0
+ * 11 - 14 free
+ * 15 R - alternate antenna
+ * 16 A1 - expect zone change (1 hour before)
+ * 17 - 18 Z1,Z2 - time zone
+ * 0 0 illegal
+ * 0 1 MEZ (MET)
+ * 1 0 MESZ (MED, MET DST)
+ * 1 1 illegal
+ * 19 A2 - expect leap insertion/deletion (1 hour before)
+ * 20 S - start of time code (1)
+ * 21 - 24 M1 - BCD (lsb first) Minutes
+ * 25 - 27 M10 - BCD (lsb first) 10 Minutes
+ * 28 P1 - Minute Parity (even)
+ * 29 - 32 H1 - BCD (lsb first) Hours
+ * 33 - 34 H10 - BCD (lsb first) 10 Hours
+ * 35 P2 - Hour Parity (even)
+ * 36 - 39 D1 - BCD (lsb first) Days
+ * 40 - 41 D10 - BCD (lsb first) 10 Days
+ * 42 - 44 DW - BCD (lsb first) day of week (1: Monday -> 7: Sunday)
+ * 45 - 49 MO - BCD (lsb first) Month
+ * 50 MO0 - 10 Months
+ * 51 - 53 Y1 - BCD (lsb first) Years
+ * 54 - 57 Y10 - BCD (lsb first) 10 Years
+ * 58 P3 - Date Parity (even)
+ * 59 - usually missing (minute indication), except for leap insertion
+ */
+
+/*-----------------------------------------------------------------------
+ * conversion table to map DCF77 bit stream into data fields.
+ * Encoding:
+ * Each field of the DCF77 code is described with two adjacent entries in
+ * this table. The first entry specifies the offset into the DCF77 data stream
+ * while the length is given as the difference between the start index and
+ * the start index of the following field.
+ */
+static struct rawdcfcode
+{
+ char offset; /* start bit */
+} rawdcfcode[] =
+{
+ { 0 }, { 15 }, { 16 }, { 17 }, { 19 }, { 20 }, { 21 }, { 25 }, { 28 }, { 29 },
+ { 33 }, { 35 }, { 36 }, { 40 }, { 42 }, { 45 }, { 49 }, { 50 }, { 54 }, { 58 }, { 59 }
+};
+
+/*-----------------------------------------------------------------------
+ * symbolic names for the fields of DCF77 describes in "rawdcfcode".
+ * see comment above for the structure of the DCF77 data
+ */
+#define DCF_M 0
+#define DCF_R 1
+#define DCF_A1 2
+#define DCF_Z 3
+#define DCF_A2 4
+#define DCF_S 5
+#define DCF_M1 6
+#define DCF_M10 7
+#define DCF_P1 8
+#define DCF_H1 9
+#define DCF_H10 10
+#define DCF_P2 11
+#define DCF_D1 12
+#define DCF_D10 13
+#define DCF_DW 14
+#define DCF_MO 15
+#define DCF_MO0 16
+#define DCF_Y1 17
+#define DCF_Y10 18
+#define DCF_P3 19
+
+/*-----------------------------------------------------------------------
+ * parity field table (same encoding as rawdcfcode)
+ * This table describes the sections of the DCF77 code that are
+ * parity protected
+ */
+static struct partab
+{
+ char offset; /* start bit of parity field */
+} partab[] =
+{
+ { 21 }, { 29 }, { 36 }, { 59 }
+};
+
+/*-----------------------------------------------------------------------
+ * offsets for parity field descriptions
+ */
+#define DCF_P_P1 0
+#define DCF_P_P2 1
+#define DCF_P_P3 2
+
+/*-----------------------------------------------------------------------
+ * legal values for time zone information
+ */
+#define DCF_Z_MET 0x2
+#define DCF_Z_MED 0x1
+
+/*-----------------------------------------------------------------------
+ * symbolic representation if the DCF77 data stream
+ */
+static struct dcfparam
+{
+ unsigned char onebits[60];
+ unsigned char zerobits[60];
+} dcfparam =
+{
+ "###############RADMLS1248124P124812P1248121241248112481248P", /* 'ONE' representation */
+ "--------------------s-------p------p----------------------p" /* 'ZERO' representation */
+};
+
+/*-----------------------------------------------------------------------
+ * extract a bitfield from DCF77 datastream
+ * All numeric fields are LSB first.
+ * buf holds a pointer to a DCF77 data buffer in symbolic
+ * representation
+ * idx holds the index to the field description in rawdcfcode
+ */
+static unsigned long
+ext_bf(
+ register unsigned char *buf,
+ register int idx
+ )
+{
+ register unsigned long sum = 0;
+ register int i, first;
+
+ first = rawdcfcode[idx].offset;
+
+ for (i = rawdcfcode[idx+1].offset - 1; i >= first; i--)
+ {
+ sum <<= 1;
+ sum |= (buf[i] != dcfparam.zerobits[i]);
+ }
+ return sum;
+}
+
+/*-----------------------------------------------------------------------
+ * check even parity integrity for a bitfield
+ *
+ * buf holds a pointer to a DCF77 data buffer in symbolic
+ * representation
+ * idx holds the index to the field description in partab
+ */
+static unsigned
+pcheck(
+ register unsigned char *buf,
+ register int idx
+ )
+{
+ register int i,last;
+ register unsigned psum = 1;
+
+ last = partab[idx+1].offset;
+
+ for (i = partab[idx].offset; i < last; i++)
+ psum ^= (buf[i] != dcfparam.zerobits[i]);
+
+ return psum;
+}
+
+/*-----------------------------------------------------------------------
+ * convert a DCF77 data buffer into wall clock time + flags
+ *
+ * buffer holds a pointer to a DCF77 data buffer in symbolic
+ * representation
+ * size describes the length of DCF77 information in bits (represented
+ * as chars in symbolic notation
+ * clock points to a wall clock time description of the DCF77 data (result)
+ */
+static unsigned long
+convert_rawdcf(
+ unsigned char *buffer,
+ int size,
+ clocktime_t *clock_time
+ )
+{
+ if (size < 57)
+ {
+ PRINTF("%-30s", "*** INCOMPLETE");
+ return CVT_NONE;
+ }
+
+ /*
+ * check Start and Parity bits
+ */
+ if ((ext_bf(buffer, DCF_S) == 1) &&
+ pcheck(buffer, DCF_P_P1) &&
+ pcheck(buffer, DCF_P_P2) &&
+ pcheck(buffer, DCF_P_P3))
+ {
+ /*
+ * buffer OK - extract all fields and build wall clock time from them
+ */
+
+ clock_time->flags = 0;
+ clock_time->usecond= 0;
+ clock_time->second = 0;
+ clock_time->minute = ext_bf(buffer, DCF_M10);
+ clock_time->minute = TIMES10(clock_time->minute) + ext_bf(buffer, DCF_M1);
+ clock_time->hour = ext_bf(buffer, DCF_H10);
+ clock_time->hour = TIMES10(clock_time->hour) + ext_bf(buffer, DCF_H1);
+ clock_time->day = ext_bf(buffer, DCF_D10);
+ clock_time->day = TIMES10(clock_time->day) + ext_bf(buffer, DCF_D1);
+ clock_time->month = ext_bf(buffer, DCF_MO0);
+ clock_time->month = TIMES10(clock_time->month) + ext_bf(buffer, DCF_MO);
+ clock_time->year = ext_bf(buffer, DCF_Y10);
+ clock_time->year = TIMES10(clock_time->year) + ext_bf(buffer, DCF_Y1);
+ clock_time->wday = ext_bf(buffer, DCF_DW);
+
+ /*
+ * determine offset to UTC by examining the time zone
+ */
+ switch (ext_bf(buffer, DCF_Z))
+ {
+ case DCF_Z_MET:
+ clock_time->utcoffset = -60;
+ break;
+
+ case DCF_Z_MED:
+ clock_time->flags |= DCFB_DST;
+ clock_time->utcoffset = -120;
+ break;
+
+ default:
+ PRINTF("%-30s", "*** BAD TIME ZONE");
+ return CVT_FAIL|CVT_BADFMT;
+ }
+
+ /*
+ * extract various warnings from DCF77
+ */
+ if (ext_bf(buffer, DCF_A1))
+ clock_time->flags |= DCFB_ANNOUNCE;
+
+ if (ext_bf(buffer, DCF_A2))
+ clock_time->flags |= DCFB_LEAP;
+
+ if (ext_bf(buffer, DCF_R))
+ clock_time->flags |= DCFB_ALTERNATE;
+
+ return CVT_OK;
+ }
+ else
+ {
+ /*
+ * bad format - not for us
+ */
+ PRINTF("%-30s", "*** BAD FORMAT (invalid/parity)");
+ return CVT_FAIL|CVT_BADFMT;
+ }
+}
+
+/*-----------------------------------------------------------------------
+ * raw dcf input routine - fix up 50 baud
+ * characters for 1/0 decision
+ */
+static unsigned long
+cvt_rawdcf(
+ unsigned char *buffer,
+ int size,
+ clocktime_t *clock_time
+ )
+{
+ register unsigned char *s = buffer;
+ register unsigned char *e = buffer + size;
+ register unsigned char *b = dcfparam.onebits;
+ register unsigned char *c = dcfparam.zerobits;
+ register unsigned rtc = CVT_NONE;
+ register unsigned int i, lowmax, highmax, cutoff, span;
+#define BITS 9
+ unsigned char histbuf[BITS];
+ /*
+ * the input buffer contains characters with runs of consecutive
+ * bits set. These set bits are an indication of the DCF77 pulse
+ * length. We assume that we receive the pulse at 50 Baud. Thus
+ * a 100ms pulse would generate a 4 bit train (20ms per bit and
+ * start bit)
+ * a 200ms pulse would create all zeroes (and probably a frame error)
+ *
+ * The basic idea is that on corret reception we must have two
+ * maxima in the pulse length distribution histogram. (one for
+ * the zero representing pulses and one for the one representing
+ * pulses)
+ * There will always be ones in the datastream, thus we have to see
+ * two maxima.
+ * The best point to cut for a 1/0 decision is the minimum between those
+ * between the maxima. The following code tries to find this cutoff point.
+ */
+
+ /*
+ * clear histogram buffer
+ */
+ for (i = 0; i < BITS; i++)
+ {
+ histbuf[i] = 0;
+ }
+
+ cutoff = 0;
+ lowmax = 0;
+
+ /*
+ * convert sequences of set bits into bits counts updating
+ * the histogram alongway
+ */
+ while (s < e)
+ {
+ register unsigned int ch = *s ^ 0xFF;
+ /*
+ * check integrity and update histogramm
+ */
+ if (!((ch+1) & ch) || !*s)
+ {
+ /*
+ * character ok
+ */
+ for (i = 0; ch; i++)
+ {
+ ch >>= 1;
+ }
+
+ *s = i;
+ histbuf[i]++;
+ cutoff += i;
+ lowmax++;
+ }
+ else
+ {
+ /*
+ * invalid character (no consecutive bit sequence)
+ */
+ dprintf(("parse: cvt_rawdcf: character check for 0x%x@%d FAILED\n", *s, s - buffer));
+ *s = (unsigned char)~0;
+ rtc = CVT_FAIL|CVT_BADFMT;
+ }
+ s++;
+ }
+
+ /*
+ * first cutoff estimate (average bit count - must be between both
+ * maxima)
+ */
+ if (lowmax)
+ {
+ cutoff /= lowmax;
+ }
+ else
+ {
+ cutoff = 4; /* doesn't really matter - it'll fail anyway, but gives error output */
+ }
+
+ dprintf(("parse: cvt_rawdcf: average bit count: %d\n", cutoff));
+
+ lowmax = 0; /* weighted sum */
+ highmax = 0; /* bitcount */
+
+ /*
+ * collect weighted sum of lower bits (left of initial guess)
+ */
+ dprintf(("parse: cvt_rawdcf: histogram:"));
+ for (i = 0; i <= cutoff; i++)
+ {
+ lowmax += histbuf[i] * i;
+ highmax += histbuf[i];
+ dprintf((" %d", histbuf[i]));
+ }
+ dprintf((" <M>"));
+
+ /*
+ * round up
+ */
+ lowmax += highmax / 2;
+
+ /*
+ * calculate lower bit maximum (weighted sum / bit count)
+ *
+ * avoid divide by zero
+ */
+ if (highmax)
+ {
+ lowmax /= highmax;
+ }
+ else
+ {
+ lowmax = 0;
+ }
+
+ highmax = 0; /* weighted sum of upper bits counts */
+ cutoff = 0; /* bitcount */
+
+ /*
+ * collect weighted sum of lower bits (right of initial guess)
+ */
+ for (; i < BITS; i++)
+ {
+ highmax+=histbuf[i] * i;
+ cutoff +=histbuf[i];
+ dprintf((" %d", histbuf[i]));
+ }
+ dprintf(("\n"));
+
+ /*
+ * determine upper maximum (weighted sum / bit count)
+ */
+ if (cutoff)
+ {
+ highmax /= cutoff;
+ }
+ else
+ {
+ highmax = BITS-1;
+ }
+
+ /*
+ * following now holds:
+ * lowmax <= cutoff(initial guess) <= highmax
+ * best cutoff is the minimum nearest to higher bits
+ */
+
+ /*
+ * find the minimum between lowmax and highmax (detecting
+ * possibly a minimum span)
+ */
+ span = cutoff = lowmax;
+ for (i = lowmax; i <= highmax; i++)
+ {
+ if (histbuf[cutoff] > histbuf[i])
+ {
+ /*
+ * got a new minimum move beginning of minimum (cutoff) and
+ * end of minimum (span) there
+ */
+ cutoff = span = i;
+ }
+ else
+ if (histbuf[cutoff] == histbuf[i])
+ {
+ /*
+ * minimum not better yet - but it spans more than
+ * one bit value - follow it
+ */
+ span = i;
+ }
+ }
+
+ /*
+ * cutoff point for 1/0 decision is the middle of the minimum section
+ * in the histogram
+ */
+ cutoff = (cutoff + span) / 2;
+
+ dprintf(("parse: cvt_rawdcf: lower maximum %d, higher maximum %d, cutoff %d\n", lowmax, highmax, cutoff));
+
+ /*
+ * convert the bit counts to symbolic 1/0 information for data conversion
+ */
+ s = buffer;
+ while ((s < e) && *c && *b)
+ {
+ if (*s == (unsigned char)~0)
+ {
+ /*
+ * invalid character
+ */
+ *s = '?';
+ }
+ else
+ {
+ /*
+ * symbolic 1/0 representation
+ */
+ *s = (*s >= cutoff) ? *b : *c;
+ }
+ s++;
+ b++;
+ c++;
+ }
+
+ /*
+ * if everything went well so far return the result of the symbolic
+ * conversion routine else just the accumulated errors
+ */
+ if (rtc != CVT_NONE)
+ {
+ PRINTF("%-30s", "*** BAD DATA");
+ }
+
+ return (rtc == CVT_NONE) ? convert_rawdcf(buffer, size, clock_time) : rtc;
+}
+
+/*-----------------------------------------------------------------------
+ * convert a wall clock time description of DCF77 to a Unix time (seconds
+ * since 1.1. 1970 UTC)
+ */
+time_t
+dcf_to_unixtime(
+ clocktime_t *clock_time,
+ unsigned *cvtrtc
+ )
+{
+#define SETRTC(_X_) { if (cvtrtc) *cvtrtc = (_X_); }
+ static int days_of_month[] =
+ {
+ 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+ };
+ register int i;
+ time_t t;
+
+ /*
+ * map 2 digit years to 19xx (DCF77 is a 20th century item)
+ */
+ if ( clock_time->year < YEAR_PIVOT ) /* in case of Y2KFixes [ */
+ clock_time->year += 100; /* *year%100, make tm_year */
+ /* *(do we need this?) */
+ if ( clock_time->year < YEAR_BREAK ) /* (failsafe if) */
+ clock_time->year += 1900; /* Y2KFixes ] */
+
+ /*
+ * must have been a really bad year code - drop it
+ */
+ if (clock_time->year < (YEAR_PIVOT + 1900) ) /* Y2KFixes */
+ {
+ SETRTC(CVT_FAIL|CVT_BADDATE);
+ return -1;
+ }
+ /*
+ * sorry, slow section here - but it's not time critical anyway
+ */
+
+ /*
+ * calculate days since 1970 (watching leap years)
+ */
+ t = julian0( clock_time->year ) - julian0( 1970 );
+
+ /* month */
+ if (clock_time->month <= 0 || clock_time->month > 12)
+ {
+ SETRTC(CVT_FAIL|CVT_BADDATE);
+ return -1; /* bad month */
+ }
+ /* adjust current leap year */
+#if 0
+ if (clock_time->month < 3 && days_per_year(clock_time->year) == 366)
+ t--;
+#endif
+
+ /*
+ * collect days from months excluding the current one
+ */
+ for (i = 1; i < clock_time->month; i++)
+ {
+ t += days_of_month[i];
+ }
+ /* day */
+ if (clock_time->day < 1 || ((clock_time->month == 2 && days_per_year(clock_time->year) == 366) ?
+ clock_time->day > 29 : clock_time->day > days_of_month[clock_time->month]))
+ {
+ SETRTC(CVT_FAIL|CVT_BADDATE);
+ return -1; /* bad day */
+ }
+
+ /*
+ * collect days from date excluding the current one
+ */
+ t += clock_time->day - 1;
+
+ /* hour */
+ if (clock_time->hour < 0 || clock_time->hour >= 24)
+ {
+ SETRTC(CVT_FAIL|CVT_BADTIME);
+ return -1; /* bad hour */
+ }
+
+ /*
+ * calculate hours from 1. 1. 1970
+ */
+ t = TIMES24(t) + clock_time->hour;
+
+ /* min */
+ if (clock_time->minute < 0 || clock_time->minute > 59)
+ {
+ SETRTC(CVT_FAIL|CVT_BADTIME);
+ return -1; /* bad min */
+ }
+
+ /*
+ * calculate minutes from 1. 1. 1970
+ */
+ t = TIMES60(t) + clock_time->minute;
+ /* sec */
+
+ /*
+ * calculate UTC in minutes
+ */
+ t += clock_time->utcoffset;
+
+ if (clock_time->second < 0 || clock_time->second > 60) /* allow for LEAPs */
+ {
+ SETRTC(CVT_FAIL|CVT_BADTIME);
+ return -1; /* bad sec */
+ }
+
+ /*
+ * calculate UTC in seconds - phew !
+ */
+ t = TIMES60(t) + clock_time->second;
+ /* done */
+ return t;
+}
+
+/*-----------------------------------------------------------------------
+ * cheap half baked 1/0 decision - for interactive operation only
+ */
+static char
+type(
+ unsigned int c
+ )
+{
+ c ^= 0xFF;
+ return (c > 0xF);
+}
+
+/*-----------------------------------------------------------------------
+ * week day representation
+ */
+static const char *wday[8] =
+{
+ "??",
+ "Mo",
+ "Tu",
+ "We",
+ "Th",
+ "Fr",
+ "Sa",
+ "Su"
+};
+
+/*-----------------------------------------------------------------------
+ * generate a string representation for a timeval
+ */
+static char *
+pr_timeval(
+ struct timeval *val
+ )
+{
+ static char buf[20];
+
+ if (val->tv_sec == 0)
+ sprintf(buf, "%c0.%06ld", (val->tv_usec < 0) ? '-' : '+', (long int)l_abs(val->tv_usec));
+ else
+ sprintf(buf, "%ld.%06ld", (long int)val->tv_sec, (long int)l_abs(val->tv_usec));
+ return buf;
+}
+
+/*-----------------------------------------------------------------------
+ * correct the current time by an offset by setting the time rigorously
+ */
+static void
+set_time(
+ struct timeval *offset
+ )
+{
+ struct timeval the_time;
+
+ if (no_set)
+ return;
+
+ LPRINTF("set_time: %s ", pr_timeval(offset));
+ syslog(LOG_NOTICE, "setting time (offset %s)", pr_timeval(offset));
+
+ if (gettimeofday(&the_time, 0L) == -1)
+ {
+ perror("gettimeofday()");
+ }
+ else
+ {
+ timeradd(&the_time, offset);
+ if (settimeofday(&the_time, 0L) == -1)
+ {
+ perror("settimeofday()");
+ }
+ }
+}
+
+/*-----------------------------------------------------------------------
+ * slew the time by a given offset
+ */
+static void
+adj_time(
+ long offset
+ )
+{
+ struct timeval time_offset;
+
+ if (no_set)
+ return;
+
+ time_offset.tv_sec = offset / 1000000;
+ time_offset.tv_usec = offset % 1000000;
+
+ LPRINTF("adj_time: %ld us ", (long int)offset);
+ if (adjtime(&time_offset, 0L) == -1)
+ perror("adjtime()");
+}
+
+/*-----------------------------------------------------------------------
+ * read in a possibly previously written drift value
+ */
+static void
+read_drift(
+ const char *drift_file
+ )
+{
+ FILE *df;
+
+ df = fopen(drift_file, "r");
+ if (df != NULL)
+ {
+ int idrift = 0, fdrift = 0;
+
+ fscanf(df, "%4d.%03d", &idrift, &fdrift);
+ fclose(df);
+ LPRINTF("read_drift: %d.%03d ppm ", idrift, fdrift);
+
+ accum_drift = idrift << USECSCALE;
+ fdrift = (fdrift << USECSCALE) / 1000;
+ accum_drift += fdrift & (1<<USECSCALE);
+ LPRINTF("read_drift: drift_comp %ld ", (long int)accum_drift);
+ }
+}
+
+/*-----------------------------------------------------------------------
+ * write out the current drift value
+ */
+static void
+update_drift(
+ const char *drift_file,
+ long offset,
+ time_t reftime
+ )
+{
+ FILE *df;
+
+ df = fopen(drift_file, "w");
+ if (df != NULL)
+ {
+ int idrift = R_SHIFT(accum_drift, USECSCALE);
+ int fdrift = accum_drift & ((1<<USECSCALE)-1);
+
+ LPRINTF("update_drift: drift_comp %ld ", (long int)accum_drift);
+ fdrift = (fdrift * 1000) / (1<<USECSCALE);
+ fprintf(df, "%4d.%03d %c%ld.%06ld %.24s\n", idrift, fdrift,
+ (offset < 0) ? '-' : '+', (long int)(l_abs(offset) / 1000000),
+ (long int)(l_abs(offset) % 1000000), asctime(localtime(&reftime)));
+ fclose(df);
+ LPRINTF("update_drift: %d.%03d ppm ", idrift, fdrift);
+ }
+}
+
+/*-----------------------------------------------------------------------
+ * process adjustments derived from the DCF77 observation
+ * (controls clock PLL)
+ */
+static void
+adjust_clock(
+ struct timeval *offset,
+ const char *drift_file,
+ time_t reftime
+ )
+{
+ struct timeval toffset;
+ register long usecoffset;
+ int tmp;
+
+ if (no_set)
+ return;
+
+ if (skip_adjust)
+ {
+ skip_adjust = 0;
+ return;
+ }
+
+ toffset = *offset;
+ toffset.tv_sec = l_abs(toffset.tv_sec);
+ toffset.tv_usec = l_abs(toffset.tv_usec);
+ if (timercmp(&toffset, &max_adj_offset, >))
+ {
+ /*
+ * hopeless - set the clock - and clear the timing
+ */
+ set_time(offset);
+ clock_adjust = 0;
+ skip_adjust = 1;
+ return;
+ }
+
+ usecoffset = offset->tv_sec * 1000000 + offset->tv_usec;
+
+ clock_adjust = R_SHIFT(usecoffset, TIMECONSTANT); /* adjustment to make for next period */
+
+ tmp = 0;
+ while (adjustments > (1 << tmp))
+ tmp++;
+ adjustments = 0;
+ if (tmp > FREQ_WEIGHT)
+ tmp = FREQ_WEIGHT;
+
+ accum_drift += R_SHIFT(usecoffset << USECSCALE, TIMECONSTANT+TIMECONSTANT+FREQ_WEIGHT-tmp);
+
+ if (accum_drift > MAX_DRIFT) /* clamp into interval */
+ accum_drift = MAX_DRIFT;
+ else
+ if (accum_drift < -MAX_DRIFT)
+ accum_drift = -MAX_DRIFT;
+
+ update_drift(drift_file, usecoffset, reftime);
+ LPRINTF("clock_adjust: %s, clock_adjust %ld, drift_comp %ld(%ld) ",
+ pr_timeval(offset),(long int) R_SHIFT(clock_adjust, USECSCALE),
+ (long int)R_SHIFT(accum_drift, USECSCALE), (long int)accum_drift);
+}
+
+/*-----------------------------------------------------------------------
+ * adjust the clock by a small mount to simulate frequency correction
+ */
+static void
+periodic_adjust(
+ void
+ )
+{
+ register long adjustment;
+
+ adjustments++;
+
+ adjustment = R_SHIFT(clock_adjust, PHASE_WEIGHT);
+
+ clock_adjust -= adjustment;
+
+ adjustment += R_SHIFT(accum_drift, USECSCALE+ADJINTERVAL);
+
+ adj_time(adjustment);
+}
+
+/*-----------------------------------------------------------------------
+ * control synchronisation status (warnings) and do periodic adjusts
+ * (frequency control simulation)
+ */
+static void
+tick(
+ void
+ )
+{
+ static unsigned long last_notice = 0;
+
+#if !defined(HAVE_SIGACTION) && !defined(HAVE_SIGVEC)
+ (void)signal(SIGALRM, tick);
+#endif
+
+ periodic_adjust();
+
+ ticks += 1<<ADJINTERVAL;
+
+ if ((ticks - last_sync) > MAX_UNSYNC)
+ {
+ /*
+ * not getting time for a while
+ */
+ if (sync_state == SYNC)
+ {
+ /*
+ * completely lost information
+ */
+ sync_state = NO_SYNC;
+ syslog(LOG_INFO, "DCF77 reception lost (timeout)");
+ last_notice = ticks;
+ }
+ else
+ /*
+ * in NO_SYNC state - look whether its time to speak up again
+ */
+ if ((ticks - last_notice) > NOTICE_INTERVAL)
+ {
+ syslog(LOG_NOTICE, "still not synchronized to DCF77 - check receiver/signal");
+ last_notice = ticks;
+ }
+ }
+
+#ifndef ITIMER_REAL
+ (void) alarm(1<<ADJINTERVAL);
+#endif
+}
+
+/*-----------------------------------------------------------------------
+ * break association from terminal to avoid catching terminal
+ * or process group related signals (-> daemon operation)
+ */
+static void
+detach(
+ void
+ )
+{
+# ifdef HAVE_DAEMON
+ daemon(0, 0);
+# else /* not HAVE_DAEMON */
+ if (fork())
+ exit(0);
+
+ {
+ u_long s;
+ int max_fd;
+
+#if defined(HAVE_SYSCONF) && defined(_SC_OPEN_MAX)
+ max_fd = sysconf(_SC_OPEN_MAX);
+#else /* HAVE_SYSCONF && _SC_OPEN_MAX */
+ max_fd = getdtablesize();
+#endif /* HAVE_SYSCONF && _SC_OPEN_MAX */
+ for (s = 0; s < max_fd; s++)
+ (void) close((int)s);
+ (void) open("/", 0);
+ (void) dup2(0, 1);
+ (void) dup2(0, 2);
+#ifdef SYS_DOMAINOS
+ {
+ uid_$t puid;
+ status_$t st;
+
+ proc2_$who_am_i(&puid);
+ proc2_$make_server(&puid, &st);
+ }
+#endif /* SYS_DOMAINOS */
+#if defined(HAVE_SETPGID) || defined(HAVE_SETSID)
+# ifdef HAVE_SETSID
+ if (setsid() == (pid_t)-1)
+ syslog(LOG_ERR, "dcfd: setsid(): %m");
+# else
+ if (setpgid(0, 0) == -1)
+ syslog(LOG_ERR, "dcfd: setpgid(): %m");
+# endif
+#else /* HAVE_SETPGID || HAVE_SETSID */
+ {
+ int fid;
+
+ fid = open("/dev/tty", 2);
+ if (fid >= 0)
+ {
+ (void) ioctl(fid, (u_long) TIOCNOTTY, (char *) 0);
+ (void) close(fid);
+ }
+# ifdef HAVE_SETPGRP_0
+ (void) setpgrp();
+# else /* HAVE_SETPGRP_0 */
+ (void) setpgrp(0, getpid());
+# endif /* HAVE_SETPGRP_0 */
+ }
+#endif /* HAVE_SETPGID || HAVE_SETSID */
+ }
+#endif /* not HAVE_DAEMON */
+}
+
+/*-----------------------------------------------------------------------
+ * list possible arguments and options
+ */
+static void
+usage(
+ char *program
+ )
+{
+ fprintf(stderr, "usage: %s [-n] [-f] [-l] [-t] [-i] [-o] [-d <drift_file>] [-D <input delay>] <device>\n", program);
+ fprintf(stderr, "\t-n do not change time\n");
+ fprintf(stderr, "\t-i interactive\n");
+ fprintf(stderr, "\t-t trace (print all datagrams)\n");
+ fprintf(stderr, "\t-f print all databits (includes PTB private data)\n");
+ fprintf(stderr, "\t-l print loop filter debug information\n");
+ fprintf(stderr, "\t-o print offet average for current minute\n");
+ fprintf(stderr, "\t-Y make internal Y2K checks then exit\n"); /* Y2KFixes */
+ fprintf(stderr, "\t-d <drift_file> specify alternate drift file\n");
+ fprintf(stderr, "\t-D <input delay>specify delay from input edge to processing in micro seconds\n");
+}
+
+/*-----------------------------------------------------------------------
+ * check_y2k() - internal check of Y2K logic
+ * (a lot of this logic lifted from ../ntpd/check_y2k.c)
+ */
+int
+check_y2k( void )
+{
+ int year; /* current working year */
+ int year0 = 1900; /* sarting year for NTP time */
+ int yearend; /* ending year we test for NTP time.
+ * 32-bit systems: through 2036, the
+ **year in which NTP time overflows.
+ * 64-bit systems: a reasonable upper
+ **limit (well, maybe somewhat beyond
+ **reasonable, but well before the
+ **max time, by which time the earth
+ **will be dead.) */
+ time_t Time;
+ struct tm LocalTime;
+
+ int Fatals, Warnings;
+#define Error(year) if ( (year)>=2036 && LocalTime.tm_year < 110 ) \
+ Warnings++; else Fatals++
+
+ Fatals = Warnings = 0;
+
+ Time = time( (time_t *)NULL );
+ LocalTime = *localtime( &Time );
+
+ year = ( sizeof( u_long ) > 4 ) /* save max span using year as temp */
+ ? ( 400 * 3 ) /* three greater gregorian cycles */
+ : ((int)(0x7FFFFFFF / 365.242 / 24/60/60)* 2 ); /*32-bit limit*/
+ /* NOTE: will automacially expand test years on
+ * 64 bit machines.... this may cause some of the
+ * existing ntp logic to fail for years beyond
+ * 2036 (the current 32-bit limit). If all checks
+ * fail ONLY beyond year 2036 you may ignore such
+ * errors, at least for a decade or so. */
+ yearend = year0 + year;
+
+ year = 1900+YEAR_PIVOT;
+ printf( " starting year %04d\n", (int) year );
+ printf( " ending year %04d\n", (int) yearend );
+
+ for ( ; year < yearend; year++ )
+ {
+ clocktime_t ct;
+ time_t Observed;
+ time_t Expected;
+ unsigned Flag;
+ unsigned long t;
+
+ ct.day = 1;
+ ct.month = 1;
+ ct.year = year;
+ ct.hour = ct.minute = ct.second = ct.usecond = 0;
+ ct.utcoffset = 0;
+ ct.flags = 0;
+
+ Flag = 0;
+ Observed = dcf_to_unixtime( &ct, &Flag );
+ /* seems to be a clone of parse_to_unixtime() with
+ * *a minor difference to arg2 type */
+ if ( ct.year != year )
+ {
+ fprintf( stdout,
+ "%04d: dcf_to_unixtime(,%d) CORRUPTED ct.year: was %d\n",
+ (int)year, (int)Flag, (int)ct.year );
+ Error(year);
+ break;
+ }
+ t = julian0(year) - julian0(1970); /* Julian day from 1970 */
+ Expected = t * 24 * 60 * 60;
+ if ( Observed != Expected || Flag )
+ { /* time difference */
+ fprintf( stdout,
+ "%04d: dcf_to_unixtime(,%d) FAILURE: was=%lu s/b=%lu (%ld)\n",
+ year, (int)Flag,
+ (unsigned long)Observed, (unsigned long)Expected,
+ ((long)Observed - (long)Expected) );
+ Error(year);
+ break;
+ }
+
+ if ( year >= YEAR_PIVOT+1900 )
+ {
+ /* check year % 100 code we put into dcf_to_unixtime() */
+ ct.year = year % 100;
+ Flag = 0;
+
+ Observed = dcf_to_unixtime( &ct, &Flag );
+
+ if ( Observed != Expected || Flag )
+ { /* time difference */
+ fprintf( stdout,
+"%04d: dcf_to_unixtime(%d,%d) FAILURE: was=%lu s/b=%lu (%ld)\n",
+ year, (int)ct.year, (int)Flag,
+ (unsigned long)Observed, (unsigned long)Expected,
+ ((long)Observed - (long)Expected) );
+ Error(year);
+ break;
+ }
+
+ /* check year - 1900 code we put into dcf_to_unixtime() */
+ ct.year = year - 1900;
+ Flag = 0;
+
+ Observed = dcf_to_unixtime( &ct, &Flag );
+
+ if ( Observed != Expected || Flag ) { /* time difference */
+ fprintf( stdout,
+ "%04d: dcf_to_unixtime(%d,%d) FAILURE: was=%lu s/b=%lu (%ld)\n",
+ year, (int)ct.year, (int)Flag,
+ (unsigned long)Observed, (unsigned long)Expected,
+ ((long)Observed - (long)Expected) );
+ Error(year);
+ break;
+ }
+
+
+ }
+ }
+
+ return ( Fatals );
+}
+
+/*--------------------------------------------------
+ * rawdcf_init - set up modem lines for RAWDCF receivers
+ */
+#if defined(TIOCMSET) && (defined(TIOCM_DTR) || defined(CIOCM_DTR))
+static void
+rawdcf_init(
+ int fd
+ )
+{
+ /*
+ * You can use the RS232 to supply the power for a DCF77 receiver.
+ * Here a voltage between the DTR and the RTS line is used. Unfortunately
+ * the name has changed from CIOCM_DTR to TIOCM_DTR recently.
+ */
+
+#ifdef TIOCM_DTR
+ int sl232 = TIOCM_DTR; /* turn on DTR for power supply */
+#else
+ int sl232 = CIOCM_DTR; /* turn on DTR for power supply */
+#endif
+
+ if (ioctl(fd, TIOCMSET, (caddr_t)&sl232) == -1)
+ {
+ syslog(LOG_NOTICE, "rawdcf_init: WARNING: ioctl(fd, TIOCMSET, [C|T]IOCM_DTR): %m");
+ }
+}
+#else
+static void
+rawdcf_init(
+ int fd
+ )
+{
+ syslog(LOG_NOTICE, "rawdcf_init: WARNING: OS interface incapable of setting DTR to power DCF modules");
+}
+#endif /* DTR initialisation type */
+
+/*-----------------------------------------------------------------------
+ * main loop - argument interpreter / setup / main loop
+ */
+int
+main(
+ int argc,
+ char **argv
+ )
+{
+ unsigned char c;
+ char **a = argv;
+ int ac = argc;
+ char *file = NULL;
+ const char *drift_file = "/etc/dcfd.drift";
+ int fd;
+ int offset = 15;
+ int offsets = 0;
+ int delay = DEFAULT_DELAY; /* average delay from input edge to time stamping */
+ int trace = 0;
+ int errs = 0;
+
+ /*
+ * process arguments
+ */
+ while (--ac)
+ {
+ char *arg = *++a;
+ if (*arg == '-')
+ while ((c = *++arg))
+ switch (c)
+ {
+ case 't':
+ trace = 1;
+ interactive = 1;
+ break;
+
+ case 'f':
+ offset = 0;
+ interactive = 1;
+ break;
+
+ case 'l':
+ loop_filter_debug = 1;
+ offsets = 1;
+ interactive = 1;
+ break;
+
+ case 'n':
+ no_set = 1;
+ break;
+
+ case 'o':
+ offsets = 1;
+ interactive = 1;
+ break;
+
+ case 'i':
+ interactive = 1;
+ break;
+
+ case 'D':
+ if (ac > 1)
+ {
+ delay = atoi(*++a);
+ ac--;
+ }
+ else
+ {
+ fprintf(stderr, "%s: -D requires integer argument\n", argv[0]);
+ errs=1;
+ }
+ break;
+
+ case 'd':
+ if (ac > 1)
+ {
+ drift_file = *++a;
+ ac--;
+ }
+ else
+ {
+ fprintf(stderr, "%s: -d requires file name argument\n", argv[0]);
+ errs=1;
+ }
+ break;
+
+ case 'Y':
+ errs=check_y2k();
+ exit( errs ? 1 : 0 );
+
+ default:
+ fprintf(stderr, "%s: unknown option -%c\n", argv[0], c);
+ errs=1;
+ break;
+ }
+ else
+ if (file == NULL)
+ file = arg;
+ else
+ {
+ fprintf(stderr, "%s: device specified twice\n", argv[0]);
+ errs=1;
+ }
+ }
+
+ if (errs)
+ {
+ usage(argv[0]);
+ exit(1);
+ }
+ else
+ if (file == NULL)
+ {
+ fprintf(stderr, "%s: device not specified\n", argv[0]);
+ usage(argv[0]);
+ exit(1);
+ }
+
+ errs = LINES+1;
+
+ /*
+ * get access to DCF77 tty port
+ */
+ fd = open(file, O_RDONLY);
+ if (fd == -1)
+ {
+ perror(file);
+ exit(1);
+ }
+ else
+ {
+ int i, rrc;
+ struct timeval t, tt, tlast;
+ struct timeval timeout;
+ struct timeval phase;
+ struct timeval time_offset;
+ char pbuf[61]; /* printable version */
+ char buf[61]; /* raw data */
+ clocktime_t clock_time; /* wall clock time */
+ time_t utc_time = 0;
+ time_t last_utc_time = 0;
+ long usecerror = 0;
+ long lasterror = 0;
+#if defined(HAVE_TERMIOS_H) || defined(STREAM)
+ struct termios term;
+#else /* not HAVE_TERMIOS_H || STREAM */
+# if defined(HAVE_TERMIO_H) || defined(HAVE_SYSV_TTYS)
+ struct termio term;
+# endif/* HAVE_TERMIO_H || HAVE_SYSV_TTYS */
+#endif /* not HAVE_TERMIOS_H || STREAM */
+ unsigned int rtc = CVT_NONE;
+
+ rawdcf_init(fd);
+
+ timeout.tv_sec = 1;
+ timeout.tv_usec = 500000;
+
+ phase.tv_sec = 0;
+ phase.tv_usec = delay;
+
+ /*
+ * setup TTY (50 Baud, Read, 8Bit, No Hangup, 1 character IO)
+ */
+ if (TTY_GETATTR(fd, &term) == -1)
+ {
+ perror("tcgetattr");
+ exit(1);
+ }
+
+ memset(term.c_cc, 0, sizeof(term.c_cc));
+ term.c_cc[VMIN] = 1;
+#ifdef NO_PARENB_IGNPAR
+ term.c_cflag = B50|CS8|CREAD|CLOCAL;
+#else
+ term.c_cflag = B50|CS8|CREAD|CLOCAL|PARENB;
+#endif
+ term.c_iflag = IGNPAR;
+ term.c_oflag = 0;
+ term.c_lflag = 0;
+
+ if (TTY_SETATTR(fd, &term) == -1)
+ {
+ perror("tcsetattr");
+ exit(1);
+ }
+
+ /*
+ * loose terminal if in daemon operation
+ */
+ if (!interactive)
+ detach();
+
+ /*
+ * get syslog() initialized
+ */
+#ifdef LOG_DAEMON
+ openlog("dcfd", LOG_PID, LOG_DAEMON);
+#else
+ openlog("dcfd", LOG_PID);
+#endif
+
+ /*
+ * setup periodic operations (state control / frequency control)
+ */
+#ifdef HAVE_SIGVEC
+ {
+ struct sigvec vec;
+
+ vec.sv_handler = tick;
+ vec.sv_mask = 0;
+ vec.sv_flags = 0;
+
+ if (sigvec(SIGALRM, &vec, (struct sigvec *)0) == -1)
+ {
+ syslog(LOG_ERR, "sigvec(SIGALRM): %m");
+ exit(1);
+ }
+ }
+#else
+#ifdef HAVE_SIGACTION
+ {
+ struct sigaction act;
+
+ act.sa_handler = tick;
+# ifdef HAVE_SA_SIGACTION_IN_STRUCT_SIGACTION
+ act.sa_sigaction = (void (*) P((int, siginfo_t *, void *)))0;
+# endif /* HAVE_SA_SIGACTION_IN_STRUCT_SIGACTION */
+ sigemptyset(&act.sa_mask);
+ act.sa_flags = 0;
+
+ if (sigaction(SIGALRM, &act, (struct sigaction *)0) == -1)
+ {
+ syslog(LOG_ERR, "sigaction(SIGALRM): %m");
+ exit(1);
+ }
+ }
+#else
+ (void) signal(SIGALRM, tick);
+#endif
+#endif
+
+#ifdef ITIMER_REAL
+ {
+ struct itimerval it;
+
+ it.it_interval.tv_sec = 1<<ADJINTERVAL;
+ it.it_interval.tv_usec = 0;
+ it.it_value.tv_sec = 1<<ADJINTERVAL;
+ it.it_value.tv_usec = 0;
+
+ if (setitimer(ITIMER_REAL, &it, (struct itimerval *)0) == -1)
+ {
+ syslog(LOG_ERR, "setitimer: %m");
+ exit(1);
+ }
+ }
+#else
+ (void) alarm(1<<ADJINTERVAL);
+#endif
+
+ PRINTF(" DCF77 monitor - Copyright (C) 1993-1998 by Frank Kardel\n\n");
+
+ pbuf[60] = '\0';
+ for ( i = 0; i < 60; i++)
+ pbuf[i] = '.';
+
+ read_drift(drift_file);
+
+ /*
+ * what time is it now (for interval measurement)
+ */
+ gettimeofday(&tlast, 0L);
+ i = 0;
+ /*
+ * loop until input trouble ...
+ */
+ do
+ {
+ /*
+ * get an impulse
+ */
+ while ((rrc = read(fd, &c, 1)) == 1)
+ {
+ gettimeofday(&t, 0L);
+ tt = t;
+ timersub(&t, &tlast);
+
+ if (errs > LINES)
+ {
+ PRINTF(" %s", &"PTB private....RADMLSMin....PHour..PMDay..DayMonthYear....P\n"[offset]);
+ PRINTF(" %s", &"---------------RADMLS1248124P124812P1248121241248112481248P\n"[offset]);
+ errs = 0;
+ }
+
+ /*
+ * timeout -> possible minute mark -> interpretation
+ */
+ if (timercmp(&t, &timeout, >))
+ {
+ PRINTF("%c %.*s ", pat[i % (sizeof(pat)-1)], 59 - offset, &pbuf[offset]);
+
+ if ((rtc = cvt_rawdcf((unsigned char *)buf, i, &clock_time)) != CVT_OK)
+ {
+ /*
+ * this data was bad - well - forget synchronisation for now
+ */
+ PRINTF("\n");
+ if (sync_state == SYNC)
+ {
+ sync_state = NO_SYNC;
+ syslog(LOG_INFO, "DCF77 reception lost (bad data)");
+ }
+ errs++;
+ }
+ else
+ if (trace)
+ {
+ PRINTF("\r %.*s ", 59 - offset, &buf[offset]);
+ }
+
+
+ buf[0] = c;
+
+ /*
+ * collect first character
+ */
+ if (((c^0xFF)+1) & (c^0xFF))
+ pbuf[0] = '?';
+ else
+ pbuf[0] = type(c) ? '#' : '-';
+
+ for ( i = 1; i < 60; i++)
+ pbuf[i] = '.';
+
+ i = 0;
+ }
+ else
+ {
+ /*
+ * collect character
+ */
+ buf[i] = c;
+
+ /*
+ * initial guess (usually correct)
+ */
+ if (((c^0xFF)+1) & (c^0xFF))
+ pbuf[i] = '?';
+ else
+ pbuf[i] = type(c) ? '#' : '-';
+
+ PRINTF("%c %.*s ", pat[i % (sizeof(pat)-1)], 59 - offset, &pbuf[offset]);
+ }
+
+ if (i == 0 && rtc == CVT_OK)
+ {
+ /*
+ * we got a good time code here - try to convert it to
+ * UTC
+ */
+ if ((utc_time = dcf_to_unixtime(&clock_time, &rtc)) == -1)
+ {
+ PRINTF("*** BAD CONVERSION\n");
+ }
+
+ if (utc_time != (last_utc_time + 60))
+ {
+ /*
+ * well, two successive sucessful telegrams are not 60 seconds
+ * apart
+ */
+ PRINTF("*** NO MINUTE INC\n");
+ if (sync_state == SYNC)
+ {
+ sync_state = NO_SYNC;
+ syslog(LOG_INFO, "DCF77 reception lost (data mismatch)");
+ }
+ errs++;
+ rtc = CVT_FAIL|CVT_BADTIME|CVT_BADDATE;
+ }
+ else
+ usecerror = 0;
+
+ last_utc_time = utc_time;
+ }
+
+ if (rtc == CVT_OK)
+ {
+ if (i == 0)
+ {
+ /*
+ * valid time code - determine offset and
+ * note regained reception
+ */
+ last_sync = ticks;
+ if (sync_state == NO_SYNC)
+ {
+ syslog(LOG_INFO, "receiving DCF77");
+ }
+ else
+ {
+ /*
+ * we had at least one minute SYNC - thus
+ * last error is valid
+ */
+ time_offset.tv_sec = lasterror / 1000000;
+ time_offset.tv_usec = lasterror % 1000000;
+ adjust_clock(&time_offset, drift_file, utc_time);
+ }
+ sync_state = SYNC;
+ }
+
+ time_offset.tv_sec = utc_time + i;
+ time_offset.tv_usec = 0;
+
+ timeradd(&time_offset, &phase);
+
+ usecerror += (time_offset.tv_sec - tt.tv_sec) * 1000000 + time_offset.tv_usec
+ -tt.tv_usec;
+
+ /*
+ * output interpreted DCF77 data
+ */
+ PRINTF(offsets ? "%s, %2d:%02d:%02d, %d.%02d.%02d, <%s%s%s%s> (%c%d.%06ds)" :
+ "%s, %2d:%02d:%02d, %d.%02d.%02d, <%s%s%s%s>",
+ wday[clock_time.wday],
+ clock_time.hour, clock_time.minute, i, clock_time.day, clock_time.month,
+ clock_time.year,
+ (clock_time.flags & DCFB_ALTERNATE) ? "R" : "_",
+ (clock_time.flags & DCFB_ANNOUNCE) ? "A" : "_",
+ (clock_time.flags & DCFB_DST) ? "D" : "_",
+ (clock_time.flags & DCFB_LEAP) ? "L" : "_",
+ (lasterror < 0) ? '-' : '+', l_abs(lasterror) / 1000000, l_abs(lasterror) % 1000000
+ );
+
+ if (trace && (i == 0))
+ {
+ PRINTF("\n");
+ errs++;
+ }
+ lasterror = usecerror / (i+1);
+ }
+ else
+ {
+ lasterror = 0; /* we cannot calculate phase errors on bad reception */
+ }
+
+ PRINTF("\r");
+
+ if (i < 60)
+ {
+ i++;
+ }
+
+ tlast = tt;
+
+ if (interactive)
+ fflush(stdout);
+ }
+ } while ((rrc == -1) && (errno == EINTR));
+
+ /*
+ * lost IO - sorry guys
+ */
+ syslog(LOG_ERR, "TERMINATING - cannot read from device %s (%m)", file);
+
+ (void)close(fd);
+ }
+
+ closelog();
+
+ return 0;
+}