uucp.hour

<B>Digital的Unix操作系统VAX 4.2源码</B>

#!/bin/sh
# @(#)uucp.hour	4.1 (ULTRIX) 7/2/90
umask 022
L=/usr/spool/uucp/LOG.shells
uul=/usr/var/uucp
uu=/usr/spool/uucp

trap ':' 1

# Fire up execute daemons now.  Short delay allows command-specific daemons
# to establish their lock files so general daemon won't grab their work.

$uul/uuxqt -crnews &
$uul/uuxqt -cunbatchnews &
	sleep 15
echo "hour:$$: starting general uuxqt `date`" >>$L
$uul/uuxqt &

# Start specific polls.
#	If you have more dialers than systems listed in LIST.HOUR,
#	and the number of systems is small (2-4), you may want to
#	uncomment the line which puts the uucico in the background.
#	

if [ -f $uul/LIST.HOUR ]
    then
	for i in `sed -e 's/#.*//' $uul/LIST.HOUR`
	 do
		echo "hour:$$: starting uucico for $i `date`" >>$L
		rm -f $uu/STST./STST.$i
		#
		# To put the uucico in the background,
		# uncomment this next entry: 
		# $uul/uucico -r1 -s$i &
		# 
		$uul/uucico -r1 -s$i  # and delete this one
	 done
    fi

#
# Start general poll.
#
#	Other hourly general polls are locked out until this one finishes.

tries=0

while tries=`expr $tries + 1` ; test $tries -le 3
  do

    echo $$ >$uu/LCK...$$

    if    ln $uu/LCK...$$ $uu/LCK...hour
        then
	    echo "hour:$$: starting general uucico `date`" >>$L
	    $uul/uucico -r1
	    break
        else
	    echo "hour:$$: collision `date`" >>$L
	    # send a harmless signal to lockholder to see if it still exists
	    if    kill -CONT `cat $uu/LCK...hour`
	        then
		    # last-ditch safeguard--break the lock if old enough
		    $uul/uuclean -pLCK... -n8 -d$uu
	        else
		    # lockholder is dead, remove stale lock, try again
		    $uul/uuclean -pLCK...hour -n1 -d$uu
	        fi
        fi
  done

# wait for any site specific uucico's to finish 
wait    

# must be almost as careful while removing a lock as when creating it

if    [ -f $uu/LCK...$$ ]
    then
	# refresh our lock through its link to avoid race conditions
	echo ' ' >>$uu/LCK...$$

	if    [ $$ -eq `cat $uu/LCK...hour` ]
	    then
		# this process still owns the lock, so it can remove it
		rm -f $uu/LCK...hour
	    fi

	rm -f $uu/LCK...$$

    else
	# assume our lock has been broken
	exit
    fi

echo  "hour:$$:     complete `date`" >>$L