Re: [HACKERS] postmaster.pid

> > > 2) if it fails to create pid file, call
> > > ExitPostmaster(1). ExitPostmaster calls proc_exit() and proc_exit
> > > calls exit().
> > 
> > So you don't start if the pid file is there,
> 
> Right.
> 
> >or do you delete it if the
> > port is free?
> 
> No. even if the port is free, there might be another postmaster that
> uses another one.
> 
> Wait, maybe I can check postmaster.opts to see if another postamster
> really exists...

You can do kill(0) on the pid to see if it is actually a real pid. 
Rather than playing with the port, just check the pid because the
postmaster could be startup up by not on the port yet.

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