Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.1 6/24/83; site brl-vgr.ARPA
Path: utzoo!watmath!clyde!akgua!sdcsvax!sdcrdcf!hplabs!hao!seismo!brl-tgr!brl-vgr!gwyn
From: gwyn@brl-vgr.ARPA (Doug Gwyn )
Newsgroups: net.unix-wizards
Subject: Re: 4.2 changes to pipes, etc.
Message-ID: <1528@brl-vgr.ARPA>
Date: Mon, 7-May-84 22:17:14 EDT
Article-I.D.: brl-vgr.1528
Posted: Mon May  7 22:17:14 1984
Date-Received: Sun, 13-May-84 00:39:17 EDT
References: <304@sri-arpa.UUCP>
Organization: Ballistics Research Lab
Lines: 4

Sounds like you have unflushed buffered output into the pipe;
use fflush() to force it into the pipe without closing the stream.
It should never be necessary to close a pipe for its data to be
made available to the reader.