rc

来自「minix操作系统最新版本（3.1.1）的源代码」· 代码 · 共 168 行

# /usr/etc/rc - continued system initialization.

RANDOM_FILE=/usr/adm/random.dat
LOCAL_FILE=/usr/etc/rc.local

case "$#:$1" in
1:start|1:stop|1:down)
    action=$1
    ;;
*)  echo >&2 "Usage: $0 start|stop|down"
    exit 1
esac

if [ -f "$LOCAL_FILE" ]
then	. "$LOCAL_FILE" $1
fi

disabled()
{
    ifs="$IFS"; IFS=,
    for skip in `sysenv disable`
    do 
        if [ "$skip" = "$1" ]
	then 	 
                IFS="$ifs"; unset ifs
		return 0
	fi
    done
    IFS="$ifs"; unset ifs
    return 1
}

daemonize()
{
    # Function to start a daemon, if it exists.
    local IFS=':'
    local name="$1"
    test "$1" = tcpd && name="$2"

    for dir in $PATH
    do
	if [ -f "$dir/$1" ]
	then

            # check if this service is disabled at the boot monitor.
            if disabled $name; then return; fi

	    echo -n " $name"
	    "$@" &
	    return
	fi
    done
}

up()
{
    service=$1
    args=$2
    device=$3

    # Function to dynamically start a system service

    # First check if this service is disabled at the boot monitor.
    if disabled $service; then return; fi

    # Service is not disabled. Try to bring it up.
    command="/usr/sbin/$service"
    if [ ! -z "$args" ]; then command="$command -args \"$args\""; fi
    if [ ! -z "$device" ]; then command="$command -dev \"$device\""; fi
    echo -n " $service"
    eval service up $command
}

case $action in
start)
    # Select console font.
    test -f /etc/font && loadfont /etc/font </dev/console

    # Cleanup.
    rm -rf /tmp/. /usr/run/. /usr/spool/lpd/. /usr/spool/locks/.

    # Start servers and drivers set at the boot monitor.
    echo -n "Starting services:"
    up random "" /dev/random

    # load random number generator
    if [ -f $RANDOM_FILE ]
    then
    	cat < $RANDOM_FILE >/dev/random
    	# overwrite $RANDOM_FILE. We don't want to use this data again
    	dd if=/dev/random of=$RANDOM_FILE bs=1024 count=1 2> /dev/null
    fi

    # start only network drivers that are in use
    for driver in lance rtl8139 fxp dpeth dp8390
    do
        if grep " $driver " /etc/inet.conf > /dev/null  2>&1
        then 
            eval arg=\$${driver}_arg
            up $driver "$arg"
        fi
    done
    up inet ""
    up printer "" /dev/lp
    echo .

    # Network initialization.
    (: </dev/tcp) 2>/dev/null && net=t	# Is there a TCP/IP server?

    echo -n "Starting daemons:"
    daemonize update
    rotate /usr/log/messages 7
    daemonize usyslogd

    # Ugly error message when starting cron from CD.
    # (and cron unnecessary then so..)
    if [ ! -f /CD ]
    then	daemonize cron
    else	. /etc/rc.cd
    fi
    echo .

    if [ "$net" ]
    then
	if [ -f /etc/rc.net ]
	then
	    # Let a customized TCP/IP initialization script figure it out.
	    . /etc/rc.net
	else
	    # Standard network daemons.
    	    echo -n "Starting networking:"
	    daemonize dhcpd
	    daemonize nonamed
	    daemonize talkd
	    daemonize tcpd shell in.rshd
	    daemonize tcpd login in.rlogind
	    daemonize tcpd telnet in.telnetd
	    daemonize tcpd ftp in.ftpd
	    # The last daemon has been started, so close the list:
	    echo .
	fi
    fi

    if [ "$net" ]
    then
	# Get the nodename from the DNS and set it.
	trap '' 2
	intr -t 10 hostaddr -h || echo "Unable to obtain an IP address."
	trap 2
    fi

    # Recover files being edited when the system crashed.
    test -f /usr/bin/elvprsv && elvprsv /usr/tmp/elv*

    # Run the daily cleanup on systems that are not on at night.
    test -f /usr/etc/daily && sh /usr/etc/daily boot &

;;
stop|down)
    	# Save random data.
    	if dd if=/dev/random of=$RANDOM_FILE.new bs=1024 count=1 2>/dev/null
    	then
    		mv $RANDOM_FILE.new $RANDOM_FILE
	else
		echo 'Failed to save random data.'
	fi
esac