Off the top of my head this would be a simple bash script that would
call the app. Could look like this.
This is my quick idea. I have not tested it. Could use some work.
===== START BASH SCRIPT =====
#!/bin/bash
OUR_PID=$$
# Get the basename of the program to run
APP_NAME=$0
NANE_LENGTH=${#APP_NAME}
SHORT_NAME_LENGTH=`expr $NANE_LENGTH - 4`
CALLED_APP_NAME=`echo "$0" | cut -b -$SHORT_NAME_LENGTH`
# Use a PID lock file to see if it is already running
LOCK_FILE="$HOME/tmp/${CALLED_APP_NAME}.lock
LOCK_PID=0
if [ -f $LOCK_FILE ]; then
LOCK_PID=`< $LOCK_FILE`
fi
if [ $LOCK_PID -gt 0 ]; then
# It was run before, we have a PID but it could be an old PID
# See if that program is still running by this user, match the PID,
the program name and the user
STILL_RUNNING=`ps -p $LOCK_PID -u | grep ^$USER | grep
$CALLED_APP_NAME`
# Something returned means it is still running
if [ ! "$STILL_RUNNING" = "" ]; then
exit 0
fi
# Nothing returned means it is an old PID
fi
# Put our PID into the file to stop this script from running twice
# This is fast because the program we call could be slow to start up
echo -n "$OUR_PID" > $LOCK_FILE
# Call the app and give it any passed argument, get the PID and put it
into the lock file
$CALLED_APP_NAME $@ &
CALLED_PID=$!
echo -n "$CALLED_PID" > $LOCK_FILE
exit 0
===== START BASH SCRIPT =====
Then use this script as a wrapper for the program. If your program is
mozilla in /usr/bin/mozilla make the bash script /usr/bin/mozilla.bsh
If you have a lot of programs you want to wrap use sym links. Save the
script as /usr/bin/RunOnlyOnce.bsh
ln -s /usr/bin/RunOnlyOnce.bsh /usr/bin/mozilla.bsh
ln -s /usr/bin/RunOnlyOnce.bsh /usr/bin/gedit.bsh
ln -s /usr/bin/RunOnlyOnce.bsh /usr/bin/kmail.bsh
ln -s /usr/bin/RunOnlyOnce.bsh /usr/bin/someprogram.bsh
On Wed, 2005-11-09 at 03:24 -0800, Jhommer Oblego wrote:
> Hello,
> Just want to ask if there is a program or script that
> limits the applications to only runonce specially on
> clicking on desktop icon?
>
> I having problem on users doing multiple click on
> desktop icon or program menu and results to multiple
> program execution which slowdown the server and
> sometimes hang the server.
>
> do you have any suggestions on how to address this problem?
Royce Souther
www.SiliconTao.com
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