Hi folks:
I've been tryinh to get the following code to work. What I trying to do
is to run a ps command 2 times (with 3 secs separation) and have the awk
program capture the output kill all processes for a shutdown script.
Something is hanging. It does not run and control-C & controol-\ does
not work. Here is the script:
.$ cat /lbin/shutdown
#!/bin/bash
#
# Shutdown the cygwin system
#
# First we send SIGKILL to all process NOT in our process
# group. Then after a 5-second sleep, we send SIGKILL.
#
# The last step is to kill off our process group.
#
# Written: Paul E. McFerrin 02/15/02
#
ME=`basename $0`
TMP=/tmp/${ME}_tmp # generated script name
>$TMP
if [ -z "$CONSOLE_TTY" ]
then
echo "You must execute $ME in the console (first) window!!"
exit 2
fi
echo -e "\nShutting down CYGWIN ..."
PATH=/usr/local/apache/bin:$PATH
if [ -f /usr/local/apache/bin/apachectl ]
then
apachectl stop
fi
AWKPGM='
# PID PPID PGID WINPID TTY UID STIME COMMAND
# 442949 1 442949 4294461843 0 500 02:35:28 /usr/bin/KSH
# 652513 1 652513 4294323867 0 500 02:35:43 /usr/bin/RXVT
/PID/ { next }
{
if( $1 == pid ) {
ourpgrp = $3
}
pgroup[$3 ""] = $3
#next
}
{
nonspec[$1 ""] = $1
}
END {
print "exec 2>/dev/null" >TMP
print "# Our process group = " ourpgrp >>TMP
for( g in pgroup ) {
if( g != ourpgrp ) {
print "echo + kill -15 -" g >>TMP
print "kill -15 -" g >>TMP
}
}
print "sleep 5" >>TMP
for( g in pgroup ) {
if( g != ourpgrp ) {
print "echo + kill -9 -" g >>TMP
print "kill -9 -" g >>TMP
}
}
print "# killing off our process group" >>TMP
for( g in pgroup ) {
if( g == ourpgrp ) {
print "echo + kill -9 -" g >>TMP
print "kill -9 -" g >>TMP
}
print "echo + kill ALL -9 1 " >>TMP
print "kill -9 1" >>TMP
}
print "# killing off remaining processes, if any" >>TMP
for( pid in nonspec ) {
if( pid != $1 ) {
print "echo # nonspec = " pid >>TMP
# kill all other processes, except for me
if (NF == 8) {
print "echo + kill -9 " pid >>TMP
print "kill -9 " pid >>TMP
}
}
}
}'
if [ -p /tmp/pipe1 ]
then
rm -f /tmp/pipe1
fi
mknod /tmp/pipe1 p
exec 1>/tmp/pipe1 # keep shell opened into pipe1
gawk "$AWKPGM" TMP=$TMP pid=$$ </tmp/pipe1
ps -a >/tmp/pipe1
sleep 3
ps -a >>pipe1
1>&- # now we close the pipe1
rm -f /tmp/pipe1
if [ -s $TMP ]
then
trap '' 15 # shields up!
#/bin/sh $TMP
cat $TMP
fi
# in theory, the exit should not be reached as we should have been killed
exit 0
Is this a bug in pipes??
- Paul
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