From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Michael Paquier <michael@paquier.xyz>
Cc: Andres Freund <andres@anarazel.de>
Cc: Dilip Kumar <dilipbalaut@gmail.com>
Cc: jungleboogie0@gmail.com
Cc: pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #15964: vacuumdb.c:187:10: error: use of undeclared identifier 'FD_SETSIZE'
Date: Wed, 21 Aug 2019 10:28:31 -0400
Message-ID: <30820.1566397711@sss.pgh.pa.us> (raw)
In-Reply-To: <20190821141636.GA26948@alvherre.pgsql>
References: <20190821141636.GA26948@alvherre.pgsql>
Alvaro Herrera <alvherre@2ndquadrant.com> writes:
> I guess the other possibility is that there exists an operating system
> that returns file descriptors higher than its FD_SETSIZE, when some fds
> below FD_SETSIZE are still available. Doesn't seem realistic.
I think POSIX requires open() to select the lowest unused FD. Otherwise
tricks like closing and reopening stdout wouldn't work reliably.
regards, tom lane
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To: pgsql-bugs@postgresql.org
Cc: tgl@sss.pgh.pa.us, alvherre@2ndquadrant.com, michael@paquier.xyz, andres@anarazel.de, dilipbalaut@gmail.com, jungleboogie0@gmail.com, pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #15964: vacuumdb.c:187:10: error: use of undeclared identifier 'FD_SETSIZE'
In-Reply-To: <30820.1566397711@sss.pgh.pa.us>
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