16.01.2015 Приемники и демоны

#!/bin/bash
### BEGIN INIT INFO
# Provides:          receiver
# Required-Start:    burnedzynq $all $local_fs $remote_fs
# Required-Stop:     $local_fs $remote_fs
# Should-Start:      
# Should-Stop:      
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: GNSS receiver firmware
### END INIT INFO

set -e

# /etc/init.d/receiver: start and stop the receiver daemon

DAEMON=/tmp/receiver
REC_ENABLE=true
REC_OPTS=''
REC_DEFAULTS_FILE=/etc/default/receiver
REC_CONFIG_FILE=/etc/receiver.conf
REC_PID_FILE=/var/run/receiver.pid
REC_NICE_PARM=''
REC_IONICE_PARM=''

test -x $DAEMON || exit 0

. /lib/lsb/init-functions

if [ -s $REC_DEFAULTS_FILE ]; then
    . $REC_DEFAULTS_FILE
    case "x$REC_ENABLE" in
        xtrue|xfalse)   ;;
        xinetd)         exit 0
                        ;;
        *)              log_failure_msg "Value of REC_ENABLE in $REC_DEFAULTS_FILE must be either 'true' or 'false';"
                        log_failure_msg "not starting receiver daemon."
                        exit 1
                        ;;
    esac
    case "x$REC_NICE" in
        x[0-9])         REC_NICE_PARM="--nicelevel $REC_NICE";;
        x1[0-9])        REC_NICE_PARM="--nicelevel $REC_NICE";;
        x)              ;;
        *)              log_warning_msg "Value of REC_NICE in $REC_DEFAULTS_FILE must be a value between 0 and 19 (inclusive);"
                        log_warning_msg "ignoring REC_NICE now."
                        ;;
    esac
    case "x$REC_IONICE" in
        x-c[123]*)      REC_IONICE_PARM="$REC_IONICE";;
        x)              ;;
        *)              log_warning_msg "Value of REC_IONICE in $REC_DEFAULTS_FILE must be -c1, -c2 or -c3;"
                        log_warning_msg "ignoring REC_IONICE now."
                        ;;
    esac
fi

export PATH="${PATH:+$PATH:}/usr/sbin:/sbin"

receiver_start() {
    if [ ! -s "$REC_CONFIG_FILE" ]; then
        log_failure_msg "missing or empty config file $REC_CONFIG_FILE"
        log_end_msg 1
        exit 0
    fi
    # See ionice(1)
    if [ -n "$REC_IONICE_PARM" ] && [ -x /usr/bin/ionice ] &&
        /usr/bin/ionice "$REC_IONICE_PARM" true 2>/dev/null; then
        /usr/bin/ionice "$REC_IONICE_PARM" -p$$ > /dev/null 2>&1
    fi
    if start-stop-daemon --start --quiet --background \
        --pidfile $REC_PID_FILE --make-pidfile \
        $REC_NICE_PARM --exec $DAEMON \
        -- --no-detach --daemon --config "$REC_CONFIG_FILE" $REC_OPTS
    then
        rc=0
        sleep 1
        if ! kill -0 $(cat $REC_PID_FILE) >/dev/null 2>&1; then
            log_failure_msg "receiver daemon failed to start"
            rc=1
        fi
    else
        rc=1
    fi
    if [ $rc -eq 0 ]; then
        log_end_msg 0
    else
        log_end_msg 1
        rm -f $REC_PID_FILE
    fi
} # receiver_start


case "$1" in
  start)
        if "$REC_ENABLE"; then
            log_daemon_msg "Starting receiver daemon" "receiver"
            if [ -s $REC_PID_FILE ] && kill -0 $(cat $REC_PID_FILE) >/dev/null 2>&1; then
                log_progress_msg "apparently already running"
                log_end_msg 0
                exit 0
            fi
            receiver_start
        else
            if [ -s "$REC_CONFIG_FILE" ]; then
                [ "$VERBOSE" != no ] && log_warning_msg "receiver daemon not enabled in $REC_DEFAULTS_FILE, not starting..."
            fi
        fi
        ;;
  stop)
        log_daemon_msg "Stopping receiver daemon" "receiver"
        start-stop-daemon --stop --quiet --oknodo --pidfile $REC_PID_FILE
        log_end_msg $?
        rm -f $REC_PID_FILE
        ;;

  reload|force-reload)
        log_warning_msg "Reloading receiver daemon: not needed, as the daemon"
        log_warning_msg "re-reads the config file whenever a client connects."
        ;;

  restart)
        set +e
        if $REC_ENABLE; then
            log_daemon_msg "Restarting receiver daemon" "receiver"
            if [ -s $REC_PID_FILE ] && kill -0 $(cat $REC_PID_FILE) >/dev/null 2>&1; then
                start-stop-daemon --stop --quiet --oknodo --pidfile $REC_PID_FILE || true
                sleep 1
            else
                log_warning_msg "receiver daemon not running, attempting to start."
                rm -f $REC_PID_FILE
            fi
            receiver_start
        else
            if [ -s "$REC_CONFIG_FILE" ]; then
                [ "$VERBOSE" != no ] && log_warning_msg "receiver daemon not enabled in $REC_DEFAULTS_FILE, not starting..."
            fi
        fi
        ;;

  status)
        status_of_proc -p $REC_PID_FILE "$DAEMON" receiver
        exit $? # notreached due to set -e
        ;;
  *)
        echo "Usage: /etc/init.d/receiver {start|stop|reload|force-reload|restart|status}"
        exit 1
esac

exit 0