Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!att!alberta!ubc-cs!van-bc!rsoft!frank
From: frank@rsoft.bc.ca (Frank I. Reiter)
Newsgroups: comp.unix.questions
Subject: Re: Summary - How to tell if a process is active
Keywords: process kill ps
Message-ID: <57@rsoft.bc.ca>
Date: 22 Jun 89 13:45:45 GMT
References: <2848@infocenter.UUCP> <763@ctisbv.UUCP>
Reply-To: frank@rsoft.UUCP (Frank I. Reiter)
Organization: Reiter Software Inc., British Columbia
Lines: 24

In article <763@ctisbv.UUCP> pim@ctisbv.UUCP (Pim Zandbergen) writes:
>Then there is a system crash,
>the system is rebooted, and the application is restarteds,
>AND IS RUNNING WITH THE EXACT SAME PID! Hence, when it finds
>the lockfile, it checks for its pid and finds out it exists,

>So I am looking for some way to put some extra information into
>the lockfile to find out if the machine has been rebooted
>since the resource claim.

Have your startup code do something like "touch /etc/startup-file" .
Now your applications can compare the modification date on this
file to the modification date on your lock files.

A better alternative (IMHO) is to have a cleanup script in your startup
code which deletes any extraneous lock files.  This eliminates the need
to check dates at run time.


-- 
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Frank I. Reiter              UUCP:  {uunet,ubc-cs}!van-bc!rsoft!frank
Reiter Software Inc.                frank@rsoft.bc.ca,  a2@mindlink.UUCP
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