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From: gwyn@brl-tgr.ARPA (Doug Gwyn )
Newsgroups: net.unix-wizards
Subject: signal 0
Message-ID: <6192@brl-tgr.ARPA>
Date: Thu, 29-Nov-84 18:23:20 EST
Article-I.D.: brl-tgr.6192
Posted: Thu Nov 29 18:23:20 1984
Date-Received: Sat, 1-Dec-84 06:53:51 EST
Distribution: net
Organization: Ballistic Research Lab
Lines: 9

I couldn't find the original message about using signal 0 to determine
whether a child process has terminated without doing a wait for it.
Since then, friends have researched the issue, with the following result:

	signal 0 NOT SUPPORTED on 6th Edition UNIX, 7th Edition UNIX,
	nor 4.1BSD

	signal 0 SUPPORTED on UNIX System III, UNIX System V, Research
	Version 8, and 4.2BSD