Posted by Stut on 08/02/05 17:09

André Medeiros wrote:
> Do like some services do:
>
> 1) Check if script.pid exists
> 2) If it doesn't
> 2.1) Write the process's PID onto the file
> (http://pt.php.net/manual/en/function.getmypid.php)
> 3) If it does
> 3.1) Die gracefully :)

Personally I'd extend that slightly to have the process touch the PID
file every so often and to check that it's been touched recently when it
starts up. Alternatively use the ps shell command to check that a
process with that PID is still running, but that tends to be less reliable.

If the process does decide to continue in spite of the PID file existing
it should issue a a shell kill command to kill that PID in case it's
hung or a zombie.

-Stut

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