Xref: utzoo comp.unix.questions:6232 comp.sys.att:2862
Path: utzoo!mnetor!uunet!husc6!cmcl2!brl-adm!brl-smoke!gwyn
From: gwyn@brl-smoke.ARPA (Doug Gwyn )
Newsgroups: comp.unix.questions,comp.sys.att
Subject: Re: NO SPACE  Error message
Message-ID: <7545@brl-smoke.ARPA>
Date: 25 Mar 88 09:44:15 GMT
References: <1206@PT.CS.CMU.EDU> <127@iwtpm.ATT.COM>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 16

In article <127@iwtpm.ATT.COM> pgn@iwtpm.ATT.COM (Novorolsky) writes:
>From article <1206@PT.CS.CMU.EDU>, by edw@IUS1.CS.CMU.EDU (Eddie Wyatt):
>>   Sun's version of cc has a switch which allows you to use pipes
>Careful! Pipes are actually I/O on any implementation of UNIX (TM)
>that I have seen.

Well, of course they're I/O.  I know of three essentially different
implementations of pipes on genuine UNIX variants, and other methods
on UNIX emulators.  The real UNIX methods are:
	ripped-off inodes from pipedev (typically same as root fs)
	socket-pairs
	cross-coupled streams

The key to using pipes in cc is that they avoid the need to store
the entire intermediate file between passes, so total required
storage can indeed be reduced by this method.