Date: Wed, 11 Sep 2002 09:00:51 -0500 From: "Jacques A. Vidrine" <nectar@FreeBSD.org> To: Mike Barcroft <mike@FreeBSD.org> Cc: Bakul Shah <bakul@bitblocks.com>, Archie Cobbs <archie@dellroad.org>, freebsd-arch@FreeBSD.ORG Subject: Re: /dev/stdout behavior Message-ID: <20020911140051.GI2539@madman.nectar.cc> In-Reply-To: <20020910203012.E40217@espresso.q9media.com> References: <200209102135.g8ALZXm34757@arch20m.dellroad.org> <200209102200.SAA07377@thunderer.cnchost.com> <20020910203012.E40217@espresso.q9media.com>
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On Tue, Sep 10, 2002 at 08:30:12PM -0400, Mike Barcroft wrote:
> Bakul Shah <bakul@bitblocks.com> writes:
> > > > You need to fix your test program similarly and run it under
> > > > Linux to see if the two OSes behave differently.
> > >
> > > They do behave differently, even after adjusting '0' to '1':
> > >
> > > $ uname -a
> > > Linux foobar.packetdesign.com 2.4.9 #19 SMP Mon Oct 29 11:55:31 PST 2001
> > > i686 unknown
> > > $ ./flags
> > > O_NONBLOCK is not set
> >
> > Hmmm... are /dev/stdin etc. part of Posix? If not, linux can
> > do what it wants.
>
> POSIX specifies three special files: /dev/null, /dev/tty, and
> /dev/console. So the answer is no.
POSIX specifies /dev/stdout as a magic argument to uudecode (only?).
For example, in the POSIX specification of uudecode:
``
The following option shall be supported by the implementation:
-o outfile A pathname of a file that shall be used instead of any
pathname contained in the input data. Specifying an
outfile option-argument of /dev/stdout shall indicate
standard output.
''
and
``
The /dev/stdout concept exists on most modern systems. The
/dev/stdout syntax does not refer to a new special file. It is just
a magic cookie to specify standard output.
''
It seems that /dev/stdin and /dev/stderr are implementation specific
constructs, as is /dev/stdout except for uudecode/uuencode.
IMHO, it's very silly.
Cheers,
--
Jacques A. Vidrine <nectar@celabo.org> http://www.celabo.org/
NTT/Verio SME . FreeBSD UNIX . Heimdal Kerberos
jvidrine@verio.net . nectar@FreeBSD.org . nectar@kth.se
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