xclock is not running in a script

ahmedb72 · 01-10-2010, 12:00 PM

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:

Code:

#
# Copy of the script
#

[oracle@rac1 ~]$ cat /u01/crs/crs/script/crsclock_action.scr
#!/bin/bash
# start/stop/check script for xclock example
#  the script assumes xclock is there
#  and DISPLAY variable is set
APP=/usr/X11R6/bin/xclock
BIN_NAME=xclock

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 $1 in
 'start')
  if [ "$PID1" != "" ]
  then
   status_p1="running"
  else
    if [ -x $APP ]
    then
     ${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
     status_p1="started"
    else
     echo `basename $0`": $APP: Executable not found"
    fi
  fi
  echo "$APP: $status_p1"
  ;;
 'stop')
  if [ "${PID1}" != "" ]
  then
   kill -9 ${PID1} && echo "$APP killed"
  else
   echo "$BIN_NAME: no running Process!"
  fi
  ;;
 'check')
  if [ "$PID1" != "" ]
  then
   echo "running"
   exit 0
  else
   echo "not running"
   echo `date +"%M:%S"` $0 $* "ERR">>/tmp/mylog.log
   exit 1
  fi
  ;;
 *)
  echo "Usage: "`basename $0`" {start|stop|check}"
 ;;
 esac


#
# 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
running

[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.

c0mpm5tr · 01-10-2010, 12:14 PM

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)