2 Questions about my process control script Post: 302071233

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Top Forums Shell Programming and Scripting 2 Questions about my process control script Post 302071233 by dkaplowitz on Thursday 13th of April 2006 01:13:55 PM

04-13-2006

Registered User

2 Questions about my process control script

Hi all,

My tiny mind is struggling with the following script that shuts down Tomcat on Sol. 8 and kills any defunct processes Tomcat might leave behind (as it so often does). I realize that fixing Tomcat would be best, but this is a band-aid so I won't have to do as much off-hours support of this pig, which will hopefully buy me time to research the matter more thoroughly.

Anyway, on to the goods...

Code:

#!/bin/sh
# variables
tcpid=`ps -ef |grep java |grep -v grep |sort |awk '{print $2}'`
signal=9
tclog=/opt/local/jakarta/logs/catalina.out
now=`date +'%Y%m%d%H%M'`

# Shutdown Tomcat
/opt/local/jakarta/bin/shutdown.sh

sleep 20

if [ $tcpid != "" ]
do
    (sudo kill $signal) $tcpid
        sleep 5
else [ $tcpid = "" ]
        echo "Java Stopped"
done

# manage catalina.out, cache dirs and core dumps
cp $tclog /opt/local/jakarta/logs/catalina.out.$now
>/opt/local/jakarta/logs/catalina.out
gzip /opt/local/jakarta/logs/catalina.out.$now
rm -rf /opt/local/jakarta/work/Apache/*
find /opt/local/jakarta/ -name core |xargs rm
# wait for tomcat cache to clear
sleep 30

# restart this pig
/opt/local/jakarta/bin/startup.sh

exit

So far, my problems are in this segment:

Code:

if [ $tcpid != "" ]
do
    (sudo kill $signal) $tcpid
        sleep 5
else [ $tcpid = "" ]
        echo "Java Stopped"
done

I want to see if the pid still exists (thus is defunct, needing sudo to kill), then kill -9 it every 5 seconds or so until it goes away. Once it's gone, it can move on to the rest of the script.

What this one's doing is looping infinitely _and_ I keep getting errors about it trying to kill a process called '-9'. I've tried

`sudo kill -9 $tcpid` or (sudo kill -9 $tcpid), but to no avail.

Anyway, any pointers for how I can effectively pull this off?

Thanks!

Dave

dkaplowitz

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LEARN ABOUT OPENDARWIN

preap

preap(1)							   User Commands							  preap(1)

NAME

       preap - force a defunct process to be reaped by its parent

SYNOPSIS

       preap [-F] pid...

DESCRIPTION

       A  defunct  (or	zombie)  process  is one whose exit status has yet to be reaped by its parent. The exit status is reaped via the wait(3C),
       waitid(2), or waitpid(3C) system call. In the normal course of system operation, zombies may occur, but are typically short-lived. This may
       happen  if a parent exits without having reaped the exit status of some or all of its children. In that case, those children are reparented
       to PID 1. See init(1M), which periodically reaps such processes.

       An irresponsible parent process may not exit for a very long time and thus leave zombies on the system. Since the operating system destroys
       nearly all components of a process before it becomes defunct, such defunct processes do not normally impact system operation. However, they
       do consume a small amount of system memory.

       preap forces the parent of the process specified by pid to waitid(3C) for pid, if pid represents a defunct process.

       preap will attempt to prevent the administrator from unwisely reaping a child process which might soon be reaped by the parent, if:

	 o  The process is a child of init(1M).

	 o  The parent process is stopped and might wait on the child when it is again allowed to run.

	 o  The process has been defunct for less than one minute.

OPTIONS

       The following option is supported:

       -F	Forces the parent to reap the child, overriding safety checks.

OPERANDS

       The following operand is supported:

       pid	Process ID list.

EXIT STATUS

       The following exit values are returned by preap, which prints the exit status of each target process reaped:

       0	Successfully operation.

       non-zero Failure, such as no such process, permission denied, or invalid option.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu (32-bit)		   |
       +-----------------------------+-----------------------------+
       |			     |SUNWesxu (64-bit) 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       proc(1), init(1M), waitid(2), wait(3C), waitpid(3C), proc(4), attributes(5)

WARNINGS

       preap should be applied sparingly and only in situations in which the administrator or developer has confirmed that defunct processes  will
       not be reaped by the parent process. Otherwise, applying preap may damage the parent process in unpredictable ways.

SunOS 5.10							    26 Mar 2001 							  preap(1)