1 | #!/bin/sh
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2 |
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3 | # Note that there is no provision to prevent several copies of the script
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4 | # to be run in quick succession. In fact, it happens rather often
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5 | # if initial syncronization results in a step.
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6 | # You will see "step" and then "stratum" script runs, sometimes
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7 | # as close as only 0.002 seconds apart.
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8 | #
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9 | # Script should be ready to deal with this.
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10 |
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11 | dt=`date '+%Y-%m-%d %H:%M:%S'`
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12 |
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13 | echo "`tail -n 199 -- "$0.log" 2>/dev/null`" >"$0.log.$$"
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14 |
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15 | if test x"$1" = x"unsync" \
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16 | ; then
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17 | # No replies for our NTP requests were seen for some time.
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18 | #
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19 | # Among more mundate cases like network outages, this happens
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20 | # if we ran for a LONG time (days) and ntp server's IP has changed.
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21 | # ntpd has no code to re-resolve peers' addresses to IPs,
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22 | # we need to help it:
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23 | #
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24 | echo "$dt: $1"\
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25 | "syncronization lost, restarting ntpd"\
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26 | >>"$0.log.$$"
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27 | mv -- "$0.log.$$" "$0.log"
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28 | kill $PPID
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29 | exit
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30 | fi
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31 |
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32 | if test x"$stratum" != x"" \
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33 | && test x"$poll_interval" != x"" \
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34 | && test 4 -ge "$stratum" \
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35 | && test 128 -le "$poll_interval" \
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36 | ; then
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37 | echo "$dt: $1"\
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38 | "freq_drift_ppm=$freq_drift_ppm"\
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39 | "offset=$offset"\
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40 | "stratum=$stratum"\
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41 | "poll_interval=$poll_interval,"\
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42 | "setting hardware clock"\
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43 | >>"$0.log.$$"
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44 | mv -- "$0.log.$$" "$0.log"
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45 | exec hwclock --systohc
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46 | fi
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47 |
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48 | echo "$dt: $1"\
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49 | "freq_drift_ppm=$freq_drift_ppm"\
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50 | "offset=$offset"\
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51 | "stratum=$stratum"\
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52 | "poll_interval=$poll_interval"\
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53 | >>"$0.log.$$"
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54 | mv -- "$0.log.$$" "$0.log"
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