From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
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 10:34:49 -0400
Message-ID: <20190821143449.GA27852@alvherre.pgsql> (raw)
In-Reply-To: <30820.1566397711@sss.pgh.pa.us>
On 2019-Aug-21, Tom Lane wrote:
> 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.
Ah, yes, that's right -- my system's open(3p) manpage says:
The open() function shall return a file descriptor for the named file
that is the lowest file descriptor not currently open for that process.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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To: pgsql-bugs@postgresql.org
Cc: alvherre@2ndquadrant.com, tgl@sss.pgh.pa.us, 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: <20190821143449.GA27852@alvherre.pgsql>
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