Date: Fri, 19 Apr 2002 10:33:10 -0500 From: "Jacques A. Vidrine" <nectar@FreeBSD.org> To: Brian Somers <brian@freebsd-services.com> Cc: Robert Watson <rwatson@FreeBSD.org>, Garrett Wollman <wollman@lcs.mit.edu>, "M. Warner Losh" <imp@village.org>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern kern_descrip.c kern_exec.c src/sys/sys filedesc.h Message-ID: <20020419153310.GD31829@madman.nectar.cc> In-Reply-To: <200204191445.g3JEjXSg095842@hak.lan.Awfulhak.org> References: <Pine.NEB.3.96L.1020419103914.64976x-100000@fledge.watson.org> <200204191445.g3JEjXSg095842@hak.lan.Awfulhak.org>
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On Fri, Apr 19, 2002 at 03:45:33PM +0100, Brian Somers wrote:
> The spec is dup(2). It's not documented in open(2), but people make
> the assumption.
It's not just an assumption.
Stevens's APUE p49, in the description of `open':
``The file descriptor returned by open is guaranteed to be the
lowest numbered unused descriptor.''
McKusick, et. al.'s daemon book, p34:
``The open, pipe, and socket system calls produce new descriptors
with the lowest unused number usable for a descriptor.''
ISO/IEC 9945-1: 1996 ANSI/IEEE Std 1003.1, 1996 Edition, section
5.3.1.2:
``The open() function shall return a file descriptor for the named
file that is the lowest file descriptor not currently open for that
process.''
IEEE Std 1003.1-2001:
``The open() function shall return a file descriptor for the named file
that is the lowest file descriptor not currently open for that
process.''
et cetera
--
Jacques A. Vidrine <n@nectar.cc> http://www.nectar.cc/
NTT/Verio SME . FreeBSD UNIX . Heimdal Kerberos
jvidrine@verio.net . nectar@FreeBSD.org . nectar@kth.se
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