Current File : //sbin/shutdown

#!/usr/sbin/sh
#
# Copyright (c) 1988, 2014, Oracle and/or its affiliates. All rights reserved.
#
#	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T
#	  All Rights Reserved



#	Sequence performed to change the init state of a machine.  Only allows
#	transitions to states 0,1,5,6,s,S (i.e.: down or administrative states).

#	This procedure checks to see if you are permitted and allows an
#	interactive shutdown.  The actual change of state, killing of
#	processes and such are performed by the new init state, say 0,
#	and its /usr/sbin/rc0.

usage() {
	echo "Usage: $0 [ -y ] [ -g<grace> ] [ -r | -i<initstate> ] [ message ]"
	exit 1
}

notify() {
	/usr/sbin/wall -a <<-!
	$*
	!
	if [ -x /usr/sbin/showmount -a -x /usr/sbin/rwall ]
	then
		remotes=`/usr/sbin/showmount 2> /dev/null`
		if [ "X${remotes}" != "X" ]
		then
			/usr/sbin/rwall -q ${remotes} <<-!
			$*
			!
		fi
	fi
}

nologin=/etc/nologin

# Set the PATH so that to guarentee behavior of shell built in commands
# (such as echo).

PATH=/usr/sbin:/usr/bin:/sbin

# Initial sanity checks:
#	Make sure /usr is mounted
#	Check the user id (only root can run shutdown)

if [ ! -d /usr/bin ]
then
	echo "$0:  /usr is not mounted.  Mount /usr or use init to shutdown."
	exit 1
fi

if [ -x /usr/bin/id ]
then
	uid=$(id -u)
	if [ "${uid:=0}" -ne 0 ]
	then
	        echo "$0:  Only root can run $0"
		exit 2
	fi
else
	echo "$0:  can't check user id."
	exit 2
fi

# Get options (defaults immediately below):

grace=60
askconfirmation=yes
initstate=
reboot=

while getopts rg:i:y? c
do
	case $c in
	g)
		case $OPTARG in
		*[!0-9]* )
			echo "$0: -g requires a numeric option"
			usage
			;;
		[0-9]* )
			grace=$OPTARG
			;;
		esac
		;;
	i)
		case $OPTARG in
		[056])
			initstate=$OPTARG
			check_defdump=yes
			;;
		[Ss1])
			initstate=$OPTARG
			;;
		[234abcqQ])
			echo "$0: Initstate $OPTARG is not for system shutdown"
			exit 1
			;;
		*)
			echo "$0: $OPTARG is not a valid initstate"
			usage
			;;
		esac
		;;
	r)
		reboot=yes
		check_defdump=yes
		;;
	y)
		askconfirmation=
		;;
	\?)	usage
		;;
	esac
done
shift `expr $OPTIND - 1`

if [ -n "$initstate" -a -n "$reboot" ]; then
	usage
fi

if [ "$reboot" = "yes" ]; then
	initstate=6
	check_defdump=1
fi

if [ "$check_defdump" = "yes" ]; then
        dumpadm -C
        defdump_clear=$?
        if [ $defdump_clear -eq 0 ]; then
		echo "A previous crash dump image is preserved in memory, " \
		    "please wait until it is extracted to disk or release " \
		    "it using 'savecore -r'"
		exit 1
	fi
fi

if [ -z "$initstate" ]; then
	initstate=s
fi

echo '\nShutdown started.    \c'
/usr/bin/date
echo

NODENAME=`uname -n`

cd /

trap "rm $nologin >/dev/null 2>&1 ;exit 1"  1 2 15

# If other users are on the system (and any grace period is given), warn them.

for i in 7200 3600 1800 1200 600 300 120 60 30 10; do
	if [ ${grace} -gt $i ]
	then
		hours=`/usr/bin/expr ${grace} / 3600`
		minutes=`/usr/bin/expr ${grace} % 3600 / 60`
		seconds=`/usr/bin/expr ${grace} % 60`
		time=""
		if [ ${hours} -gt 1 ]
		then
			time="${hours} hours "
		elif [ ${hours} -eq 1 ]
		then
			time="1 hour "
		fi
		if [ ${minutes} -gt 1 ]
		then
			time="${time}${minutes} minutes "
		elif [ ${minutes} -eq 1 ]
		then
			time="${time}1 minute "
		fi
		if [ ${hours} -eq 0 -a ${seconds} -gt 0 ]
		then
			if [ ${seconds} -eq 1 ]
			then
				time="${time}${seconds} second"
			else
				time="${time}${seconds} seconds"
			fi
		fi

		(notify \
"The system ${NODENAME} will be shut down in ${time}
$*") &

pid1=$!

		rm $nologin >/dev/null 2>&1
		cat > $nologin <<-!

			NO LOGINS: System going down in ${time}
			$*

		!

		/usr/bin/sleep `/usr/bin/expr ${grace} - $i`
		grace=$i
	fi
done

# Confirm that we really want to shutdown.

if [ ${askconfirmation} ]
then
	echo "Do you want to continue? (y or n):   \c"
	read b
	if [ "$b" != "y" ]
	then
		notify "False Alarm:  The system ${NODENAME} will not be brought down."
		echo 'Shutdown aborted.'
		rm $nologin >/dev/null 2>&1
		exit 1
	fi
fi

# Final shutdown message, and sleep away the final 10 seconds (or less).

(notify \
"THE SYSTEM ${NODENAME} IS BEING SHUT DOWN NOW ! ! !
Log off now or risk your files being damaged
$*") &

pid2=$!

if [ ${grace} -gt 0 ]
then
	/usr/bin/sleep ${grace}
fi

# Go to the requested initstate.


echo "Changing to init state $initstate - please wait"

if [ "$pid1" ] || [ "$pid2" ]
then
	/usr/bin/kill $pid1 $pid2 > /dev/null 2>&1
fi

/usr/sbin/init ${initstate}