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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Noah Misch <noah@leadboat.com>
Cc: Thomas Munro <thomas.munro@gmail.com>
Cc: pgsql-committers <pgsql-committers@lists.postgresql.org>
Subject: Re: pgsql: TAP tests: check for postmaster.pid anyway when "pg_ctl start" f
Date: Thu, 10 Feb 2022 19:57:20 -0500
Message-ID: <1953533.1644541040@sss.pgh.pa.us> (raw)
In-Reply-To: <20220210225254.pds2dowte5yophmr@alap3.anarazel.de>
References: <E1nAIWI-0006et-HW@gemulon.postgresql.org>
	<CA+hUKGKV6fOHvfiPt8=dOKzvswjAyLoFoJF1iQXMNpi7+hD1JQ@mail.gmail.com>
	<855583.1642687119@sss.pgh.pa.us>
	<867290.1642689136@sss.pgh.pa.us>
	<20220120192736.msyesvdlljn6tptw@alap3.anarazel.de>
	<926839.1642708567@sss.pgh.pa.us>
	<1075553.1642717844@sss.pgh.pa.us>
	<20220210023537.GA3222837@rfd.leadboat.com>
	<1709793.1644523137@sss.pgh.pa.us>
	<20220210223806.ikpf57pz2ilamqam@alap3.anarazel.de>
	<20220210225254.pds2dowte5yophmr@alap3.anarazel.de>

Andres Freund <andres@anarazel.de> writes:
> Should we take the danger of postmaster dying without cleaning up the pid file
> and then another process reusing that pid serious? That obviously could make
> pg_ctl wait until timeout.

I'm under the impression that Unixen try not to recycle PIDs within
a short interval.  So I'm not that worried about this.  (Also, since
we treat EPERM like ESRCH, conflicting PIDs belonging to other user
IDs won't matter anyway.)

			regards, tom lane





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