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https://issues.apache.org/jira/browse/DAEMON-65?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Thomas closed DAEMON-65.
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Resolution: Fixed
Fix Version/s: 1.0.2
> [daemon] runs as multiple instances, does not use PID file logic
> ----------------------------------------------------------------
>
> Key: DAEMON-65
> URL: https://issues.apache.org/jira/browse/DAEMON-65
> Project: Commons Daemon
> Issue Type: Bug
> Affects Versions: 1.0
> Environment: Operating System: Linux
> Platform: PC
> Reporter: bernard
> Priority: Critical
> Fix For: 1.0.2
>
>
> jsvc writes its own pid file but it appears that it does not have a logic that
> secures its own integrity.
> Multiple duplicate processes can be created simply by issuing the same jsvc
> command multiple times. The created processes cannot be killed using the pppid
> file for obvious reasons.
> 1) jsvc should terminate prematurely if it finds its own pid file.
> 2) jsvc should delete its own pid file when killed.
> If 1) and 2) are not acceptable because (hypothetically, because I don't know
> the specifications) the specifications require that the caller incorporates
> this
> logic, then jsvc should not write a pid file.
> Why do i think so?
> Depending on implementation, the risk of malfunctioning is much higher if the
> pid file is managed across different execution environments.
> One major reason is that these environments are not usually maintained by the
> same person.
> I guess one might try to get a file system lock on the pid file before
> launching
> the java program.
> Please excuse my ignorance if I am misinterpreting the daemon functionality in
> any way. I have tried to get responses from 3 relevant mailing lists,
> commons-user, commons-dev and tomcat-user, but nobody replied.
> I am not a Linux programmer and I would not be surprised if this kind of
> programming problem (uniqueness of id'd processes on one machine) has a
> standard
> solution under Linux.
> Because
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