#!/bin/sh
# Start/stop/restart ntpd.

# Start ntpd:
ntpd_start() {
  CMDLINE="/usr/sbin/ntpd -g"
  echo -n "Starting NTP daemon:  $CMDLINE"
  $CMDLINE -p /var/run/ntpd.pid
  echo
  # The kernel is now mocking around with the the hardware clock if
  # ntpd is running, so if the hardware clock (wall clock) is set to
  # 'localtime' execute hwclock --localtime --systohc to disable the
  # 11 minute mode kernel function:
  if [ -x /sbin/hwclock ]; then
    # Check for a broken motherboard RTC clock (where ioports for rtc are
    # unknown) to prevent hwclock causing a hang:
    if ! grep -q -w rtc /proc/ioports ; then
      CLOCK_OPT="--directisa"
    fi
    if ! grep -q "^UTC" /etc/hardwareclock 2> /dev/null ; then 
      echo "Saving system time to the hardware clock (localtime)."
      /sbin/hwclock  $CLOCK_OPT --localtime --systohc
    fi
  fi
}

# Stop ntpd:
ntpd_stop() {
  echo -n "Stopping NTP daemon..."
  if [ -r /var/run/ntpd.pid ]; then
    kill -HUP $(cat /var/run/ntpd.pid)
    rm -f /var/run/ntpd.pid
  else
    killall -HUP -q ntpd
  fi
  echo
}

# Restart ntpd:
ntpd_restart() {
  ntpd_stop
  sleep 1
  ntpd_start
}

# Check if ntpd is running
ntpd_status() {
  if [ -e /var/run/ntpd.pid ]; then
    echo "ntpd is running."
  else 
    echo "ntpd is stopped."
    exit 1
  fi
}

case "$1" in
'start')
  ntpd_start
  ;;
'stop')
  ntpd_stop
  ;;
'restart')
  ntpd_restart
  ;;
'status')
  ntpd_status
  ;;
*)
  echo "usage $0 start|stop|restart|status"
esac