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Old 01-10-2010, 12:00 PM   #1
Registered: Jan 2006
Location: Sydney
Distribution: RHEL
Posts: 72

Rep: Reputation: 15
xclock is not running in a script

hi all,

I have created the following script which runs very well when it is executed alone.

This script is to be run by a third party application (Oracle clusterware).

The script (when is run by the application) doesn't successfully execute the xclock command. It even doesn't return the $USER variable.

Following is what I got:
# Copy of the script

[oracle@rac1 ~]$ cat /u01/crs/crs/script/crsclock_action.scr
# start/stop/check script for xclock example
#  the script assumes xclock is there
#  and DISPLAY variable is set

echo `date +"%M:%S"` $0 $* $$>>/tmp/mylog.log

PID1=`ps -ef | grep $BIN_NAME | grep -v grep | grep -v xclock_app | awk '{ print $2 }'`

case $1 in
  if [ "$PID1" != "" ]
    if [ -x $APP ]
     ${APP} &
     PID1=`ps -ef | grep $BIN_NAME | grep -v grep | grep -v xclock_app | awk '{ print $2 }'`
     echo `date +"%M:%S"` $* $PID1 $USER>>/tmp/mylog.log
     echo `basename $0`": $APP: Executable not found"
  echo "$APP: $status_p1"
  if [ "${PID1}" != "" ]
   kill -9 ${PID1} && echo "$APP killed"
   echo "$BIN_NAME: no running Process!"
  if [ "$PID1" != "" ]
   echo "running"
   exit 0
   echo "not running"
   echo `date +"%M:%S"` $0 $* "ERR">>/tmp/mylog.log
   exit 1
  echo "Usage: "`basename $0`" {start|stop|check}"

# test output of the script when run alone
[oracle@rac1 ~]$ xhost +
access control disabled, clients can connect from any host
[oracle@rac1 ~]$ /u01/crs/crs/script/crsclock_action.scr start
/usr/X11R6/bin/xclock: started
# here I can see the xclock poping up in the screen

[oracle@rac1 ~]$ cat /tmp/mylog.log
44:11 /u01/crs/crs/script/crsclock_action.scr start 17694
44:11 start 17702 oracle

[oracle@rac1 ~]$ /u01/crs/crs/script/crsclock_action.scr check

[oracle@rac1 ~]$ cat /tmp/mylog.log

44:11 /u01/crs/crs/script/crsclock_action.scr start 17694
44:11 start 17702 oracle
45:22 /u01/crs/crs/script/crsclock_action.scr check 18270

[oracle@rac1 ~]$ /u01/crs/crs/script/crsclock_action.scr stop
/usr/X11R6/bin/xclock killed

# output of log when the script is run by Oracle clusterware
# log file first is flushed
[oracle@rac1 ~]$ echo ""> /tmp/mylog.log
[oracle@rac1 ~]$ crs_start myClock
Attempting to start `myClock` on member `rac1`
Start of `myClock` on member `rac1` succeeded.
[oracle@rac1 ~]$
[oracle@rac1 ~]$ cat /tmp/mylog.log
48:14 /u01/crs/crs/script/crsclock_action.scr start 19557
48:14 start
48:19 /u01/crs/crs/script/crsclock_action.scr check 19660
48:19 /u01/crs/crs/script/crsclock_action.scr check ERR
48:20 /u01/crs/crs/script/crsclock_action.scr stop 19674
48:20 /u01/crs/crs/script/crsclock_action.scr start 19682
48:20 start
48:25 /u01/crs/crs/script/crsclock_action.scr check 19724
48:25 /u01/crs/crs/script/crsclock_action.scr check ERR
48:25 /u01/crs/crs/script/crsclock_action.scr stop 19733
48:25 /u01/crs/crs/script/crsclock_action.scr start 19741
48:25 start
48:30 /u01/crs/crs/script/crsclock_action.scr check 19783
48:30 /u01/crs/crs/script/crsclock_action.scr check ERR
48:30 /u01/crs/crs/script/crsclock_action.scr stop 19792
Note: the script is automatically re-excuted by Oracle clusterware when the 'check' command returns error and that's why the start 'command' appears multiple times in the log.

Any help is appreciated.
Old 01-10-2010, 12:14 PM   #2
LQ Newbie
Registered: Feb 2006
Location: Charlotte, NC
Distribution: Slackware
Posts: 9

Rep: Reputation: 1
In the script, you say that you're assuming the DISPLAY variable is set. From what I've seen trying to get things to work with cron, I've always had to explicitly define the DISPLAY variable to get X applications to work when being run automatically from the command line.
DISPLAY=:0.0 usually works (depending on your X server setup)

Last edited by c0mpm5tr; 01-10-2010 at 12:19 PM. Reason: refinements to previous comments
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