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From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.unix.wizards
Subject: Re: how can I get filename from file descriptor?
Message-ID: <11099@smoke.BRL.MIL>
Date: 17 Sep 89 01:36:17 GMT
References: <9353@chinet.chi.il.us> <1639@cbnewsl.ATT.COM> <10850@smoke.BRL.MIL> <14280@super.ORG>
Reply-To: gwyn@brl.arpa (Doug Gwyn)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 14

In article <14280@super.ORG> rminnich@pacific.UUCP (Ronald G Minnich) writes:
-In article <10850@smoke.BRL.MIL> gwyn@brl.arpa (Doug Gwyn) writes:
->If your pipe implementation is any good (most are not), simply write 0
->bytes to it.
-Well, now i am real curious. I tried this about 6 years ago on 
-several unices, mostly on vaxes and 11s and such and a Fortune machine,
-and i never saw a zero-length write make it through to a read.
-So, anybody ever had this work? It would be kind of neat if it did...

I did say that most pipe implementations don't support this.
Back in the days of Sixth Edition UNIX, several sites implemented
"pipe internal EOF".  It's clear that streams COULD implement this;
I don't know whether or not the various flavors of streams do.
Personally I think they should.