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CD Rom Locked by shell process

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Old 07-17-2008
CD Rom Locked by shell process
Hi,
I am writing a multi-cd spanning installer for a particular software in Linux (Redhat 4 or greater / Suse )

My Program is in Java. A Shell Script is used to fork the java process. I found out that when the Installer tries to go to the next disc when prompted so, by the installer, the eject command or the umount command is not able to eject / unmount the CD which is already there in the drive.

The eject / umount reports that the device is busy.

Now I tried to find out the process which is accessing the CD-ROM device and the output of command
fuser -m /cdrom0

gives me the PID of the shell process which was used to launch this Java process.

Please note that the Java Process has a separate PID. Also please note as soon as the user launches the shell command for the installer, I copy the files to the temporary directory and then cd to the temporary dir location and then fork the java process from there.

How can i solve this problem ? How can i make the mount of the second and subsequent CD Drives work without this issue ?

Thanks,
Jiju


Double post - thread closed
Last edited by jim mcnamara; 07-17-2008 at 06:02 AM..
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LEARN ABOUT SUSE

java-functions

java-functions(7)						RPM Java packaging						 java-functions(7)

NAME

       java-functions - Functions library for Java applications. Written for the JPackage Project <http://www.jpackage.org/>:

SYNOPSIS

       set_jvm()
	    Set the java virtual machine. Use a JAVA_HOME if defined, or try to find it from java command

       set_classpath()
	    Set  the  classpath  - this functions requires a valid JAVA_HOME, JAVACMD, and JAVA_LIBDIR. JARs could be specified as an argument, or
	    via ADDITIONAL_JARS variable.

       set_javacmd()
	    set the JAVACMD variable. Options should be passed via JAVACMD_OPTS variable.

       set_flags()
	    set FLAGS variable. They could be specified as an argument, or via ADDITIONAL_FLAGS variable.

       set_options()
	    set OPTIONS variable. They could be specified as an argument, or via ADDITIONAL_OPTIONS variable.

       run()
	    run the application. It executed a following command. If VERBOSE is defined, then it prints the command to stdout.

	    exec $JAVACMD $FLAGS -classpath $CLASSPATH $OPTIONS $MAIN_CLASS "$@"

       set_jvm_dirs()
	    set JVM-related directories (JVM_LIBDIR, JAVA_VERSION, JAVAVER_LIBDIR and JAVAVER_JNIDIR variables). Requires a  correct  JAVA_LIBDIR,
	    JAVA_HOME and JAVA_CMD.

       link_jar_repository()
	    links a jar repository. Options could be found in build-jar-repository(1)

       find_jar()
	    finds a specific extention (jar or directory). Requires a correct JAVA_LIBDIR, JAVAVER_LIBDIR and JVM_LIBDIR. Used by find-jar(1) com-
	    mand.

       do_find_jar()
	    core routine used by find_jar()

       check_java_env()
	    checks java environment - the JAVA_HOME, JAVACMD, JAVA_LIBDIR, JNI_LIBDIR variables.

DESCRIPTION

       This is a library of generic shell functions which should be used on jpackage.org compatible distributions.

FILES

       /use/share/java-utils/java-functions
	    shell script functions library for Java applications

       /etc/java/java.conf
	    system-wide Java configuration file

       ~/.java/java.conf
	    user's Java configuration

SEE ALSO

   Regular Manual Pages
       build-jar-repository(1)
       find-jar(1)
       java.conf(5)
       jpackage-utils(7)

AUTHORS

       Guillaume Rousse <guillomovitch@sourceforge.net>
       Ville Skytta <scop at jpackage.org>
       David Walluck <david@jpackage.org>
       Nicolas Mailhot <Nicolas.Mailhot at laPoste.net>

REPORTING BUGS

       Report bugs using JPackage Bugzilla (http://www.jpackage.org/bugzilla/)

jpackage-utils 1.7.5						   February 2009						 java-functions(7)