Re: BUG #15964: vacuumdb.c:187:10: error: use of undeclared identifier 'FD_SETSIZE'

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
Cc: Michael Paquier <michael(at)paquier(dot)xyz>, Andres Freund <andres(at)anarazel(dot)de>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, jungleboogie0(at)gmail(dot)com, pgsql-bugs(at)lists(dot)postgresql(dot)org
Subject: Re: BUG #15964: vacuumdb.c:187:10: error: use of undeclared identifier 'FD_SETSIZE'
Date: 2019-08-21 14:28:31
Message-ID: 30820.1566397711@sss.pgh.pa.us
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Alvaro Herrera <alvherre(at)2ndquadrant(dot)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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