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Path: utzoo!watmath!clyde!burl!ulysses!allegra!mit-eddie!think!harvard!seismo!brl-tgr!gwyn
From: gwyn@brl-tgr.ARPA (Doug Gwyn <gwyn>)
Newsgroups: net.bugs.usg
Subject: "ed" bug fix
Message-ID: <1157@brl-tgr.ARPA>
Date: Mon, 2-Sep-85 03:39:39 EDT
Article-I.D.: brl-tgr.1157
Posted: Mon Sep  2 03:39:39 1985
Date-Received: Tue, 3-Sep-85 01:40:15 EDT
Distribution: net
Organization: Ballistic Research Lab
Lines: 23

FIX for PROBLEM ID 69 in the UNIX System V Known Problem List
(July 1985):

ABSTRACT: The X option of the "ed" command fails when executed
through a pipe.

As usual, this was some lazy programmer taking a short-cut.
I am posting just enough context to make the fix location clear:

...
char xxxsccsid[] = "@(#)ed.c	1.27";
...
crinit(keyp, permp)
...
	int ic, i, j, k, temp, pf[2];
	int w;	/* DAG -- added for wait bug fix */
...
	write(pf[1], buf, 10);
	while ((w = wait((int *) 0)) != i && w != -1)	/* DAG -- bug fix */
		;					/* DAG */
	if (w == -1 || read(pf[0], buf, 13)!=13) {	/* DAG */
		puts("crypt: cannot generate key");
...