Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!bcm!convex!usenet
From: tchrist@convex.COM (Tom Christiansen)
Newsgroups: comp.unix.wizards
Subject: Re: Unbuffered pipe(2)'s?
Keywords: pipe,popen,buffer
Message-ID: <1991Feb07.211021.8761@convex.com>
Date: 7 Feb 91 21:10:21 GMT
References: <1991Feb7.200815.3880@odin.corp.sgi.com>
Sender: usenet@convex.com (news access account)
Reply-To: tchrist@convex.COM (Tom Christiansen)
Organization: CONVEX Software Development, Richardson, TX
Lines: 19
Nntp-Posting-Host: pixel.convex.com

From the keyboard of gavin@krypton.asd.sgi.com (Gavin Bell):
:Is there any way to turn off the PIPE_MAX-long buffer used for pipes?
:I need simple unbuffered, one-way communication.
:
:Details on what I'm trying to do:
:
:Essentially, I have the following situation:
:
:filter1 < file_of_data | filter2

If you have the code for filter1, just unbuffer stdout, or fflush it at
will.  If you don't, there's little you can do, as the buffering is
occurring in the stdio library contained in the program.  Unbelievably
grody hacks mucking with the FILE struct using some binary patch not
withstanding, nor suggested.

--tom
--
 "All things are possible, but not all expedient."  (in life, UNIX, and perl)