Checking before start and stop processes Post: 78729

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Top Forums Shell Programming and Scripting Checking before start and stop processes Post 78729 by maldini on Thursday 21st of July 2005 11:30:45 PM

07-22-2005

Registered User

Checking before start and stop processes

Hi,

I have 2 start and stop sh.

Start sh
--------
This will start few processes.
Example code:

echo "start process : lgz200 /pipe=test_jobs"
nohup lgz200 /db=test/test1@test1 /pipe=test_jobs > ../log/lgz200_j.log &
echo "echo \"stop process (pid=$!): lgz200 /pipe=test_jobs\"" >> test_stop
echo "kill -9 $!" >> test_stop

echo "start process : lgz210 /pipe=test_jobs"
nohup lgz210 /db=test/test1@test1 > ../log/lgz210.log &
echo "echo \"stop process (pid=$!): lgz210 /pipe=test_jobs\"" >> test_stop
echo "kill -9 $!" >> test_stop

chmod 744 test_stop

exit 0

test_stop script (auto generated from start script)
--------------
echo "stop process (pid=155164): lgz200 /pipe=test_jobs"
kill -9 155164
echo "stop process (pid=128078): lgz210 /pipe=test_jobs"
kill -9 128078

Problem
-------
I wish to include checking in start and stop script like:
start - check if the process name is exist, if exist no action. else start a new process.
stop - a loop to check if the process still exists, if exist, kill it.

this 2 checking is to make sure there are no duplicate process that will be run concurently from start script and to make sure we will completely kill the process in stop script.

I am still beginner in unix, can anyone help me to show me some sample code to do the 2 checkings? Any other suggestion will be most welcomed.

Thank you very much for your help.

Regards,
weihann.

maldini

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LEARN ABOUT MOJAVE

startpar

STARTPAR(8)                                                   System Manager's Manual                                                  STARTPAR(8)

NAME

       startpar - start runlevel scripts in parallel

SYNOPSIS

       startpar [-p par] [-i iorate] [-t timeout] [-T global_timeout] [-a arg] prg1 prg2 ...
       startpar [-p par] [-i iorate] [-t timeout] [-T global_timeout] -M [ boot|start|stop]

DESCRIPTION

       startpar  is  used  to run multiple run-level scripts in parallel.  The degree of parallelism on one CPU can be set with the -p option, the
       default is full parallelism. An argument to all of the scripts can be provided with the -a option.  Processes blocked by pending  I/O  will
       cause  new  process  creation  to be weighted by the iorate factor 800.  To change this factor the option -i can be used to specify another
       value.  The amount weight=(nblockedxiorate)/1000 will be subtracted from the total number  of  processes  which  could  be  started,  where
       nblocked is the number of processes currently blocked by pending I/O.

       The  output  of  each  script is buffered and written when the script exits, so output lines of different scripts won't mix. You can modify
       this behaviour by setting a timeout.

       The timeout set with the -t option is used as buffer timeout. If the output buffer of a script is not empty and the last output was timeout
       seconds ago, startpar will flush the buffer.

       The  -T option timeout works more globally. If no output is printed for more than global_timeout seconds, startpar will flush the buffer of
       the script with the oldest output. Afterwards it will only print output of this script until it is finished.

       The -M option switches startpar into a make(1) like behaviour.  This option takes three different arguments:  boot,  start,  and  stop  for
       reading .depend.boot or .depend.start or .depend.stop respectively in the directory /etc/init.d/.  By scanning the boot and runlevel direc-
       tories in /etc/init.d/ it then executes the appropriate scripts in parallel.

FILES

       /etc/init.d/.depend.boot
       /etc/init.d/.depend.start
       /etc/init.d/.depend.stop

SEE ALSO

       init(8) insserv(8).

COPYRIGHT

       2003,2004 SuSE Linux AG, Nuernberg, Germany.
       2007 SuSE LINUX Products GmbH, Nuernberg, Germany.

AUTHOR

       Michael Schroeder <mls@suse.de>
       Takashi Iwai <tiwai@suse.de>
       Werner Fink <werner@suse.de>

                                                                     Jun 2003                                                          STARTPAR(8)

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