nginx自动启动脚本几段代码

# If the daemon file is not found, terminate the script.
test -x $DAEMON || exit 0

d_start() {
  $DAEMON || echo -n "nginx already running"
}

d_stop() {
  kill -INT `cat $PID` || echo -n "nginx not running"
}

d_reload() {
  kill -HUP `cat $PID` || echo -n "nginx could not reload"
}

case "$1" in
  start)
    echo -n "Starting $NAME"
    d_start
    echo "."
  ;;
  stop)
    echo -n "Stopping $NAME"
    d_stop
    echo "."
  ;;
  reload)
    echo -n "Reloading configuration..."
    d_reload
    echo "reloaded."
  ;;
  restart)
  echo -n "Restarting $NAME"
  d_stop
# Sleep for two seconds before starting again, this should give the
# Nginx daemon some time to perform a graceful stop.
  sleep 2
  d_start
  echo "."
  ;;
  *)
  echo "Usage: $SCRIPTNAME {start|stop|restart|reload}" >&2
  exit 3
  ;;
esac
exit 0