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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Thomas Munro <thomas.munro@gmail.com>
Cc: Andrey Borodin <x4mmm@yandex-team.ru>
Cc: Noah Misch <noah@leadboat.com>
Cc: PostgreSQL mailing lists <pgsql-bugs@lists.postgresql.org>
Cc: Michael Paquier <michael@paquier.xyz>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: Andres Freund <andres@anarazel.de>
Subject: Re: conchuela timeouts since 2021-10-09 system upgrade
Date: Fri, 19 Nov 2021 11:22:26 -0500
Message-ID: <3048125.1637338946@sss.pgh.pa.us> (raw)
In-Reply-To: <CA+hUKG+UZi3tp=e0ffO1R7eZ=x8azSJDNzO0E2zOy9PhuyOpAQ@mail.gmail.com>
References: <9BA43784-E4A7-4638-900C-FC9868C388FA@yandex-team.ru>
	<20211019030212.GB3403374@rfd.leadboat.com>
	<20211024050028.GA3310519@rfd.leadboat.com>
	<64835CF9-D9AA-49BF-A685-01C23B1023C1@yandex-team.ru>
	<20211024161942.GB3945842@rfd.leadboat.com>
	<640FA6DC-A998-4499-B3B4-2773685B8C56@yandex-team.ru>
	<20211029025600.GB298507@rfd.leadboat.com>
	<20211110041541.GA971565@rfd.leadboat.com>
	<4C43D751-8E0B-478D-B358-7C52BB5AFDAA@yandex-team.ru>
	<633901636829263@sas1-7f179212b74f.qloud-c.yandex.net>
	<20211114000952.GA1117894@rfd.leadboat.com>
	<0CD98EB5-71AC-4D84-BC90-93674B6330F4@yandex-team.ru>
	<CA+hUKGJHA24SFAQureqf0EodkXv0W0hAZybcU9OpZAp3O2uegQ@mail.gmail.com>
	<CA+hUKG+jTMdxkyZJbUGyG7ggFKABWsBwSxSzLNVm-X87DeLfqg@mail.gmail.com>
	<CA+hUKG+UZi3tp=e0ffO1R7eZ=x8azSJDNzO0E2zOy9PhuyOpAQ@mail.gmail.com>

Thomas Munro <thomas.munro@gmail.com> writes:
> Oops, that was after it had been cleared already by the OS; duh.  On
> entry to my wrapper, writefds does in fact contain the bit pattern for
> fd 13.  That led me to try a very simply C program which runs to
> completion on Linux and FreeBSD, but hangs forever on Dragonfly.

For completeness, I checked this on macOS, OpenBSD, and NetBSD,
and they all give the expected results.

			regards, tom lane





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