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From: guy@gorodish.UUCP
Newsgroups: comp.unix.questions,comp.unix.wizards
Subject: Re: Auto-logout.
Message-ID: <16183@sun.uucp>
Date: Sun, 5-Apr-87 06:59:30 EST
Article-I.D.: sun.16183
Posted: Sun Apr  5 06:59:30 1987
Date-Received: Sun, 5-Apr-87 22:37:10 EST
References: <868@bc-cis.UUCP> <149@galbp.UUCP>
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Reply-To: guy@sun.UUCP (Guy Harris)
Organization: Sun Microsystems, Mountain View
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Xref: utgpu comp.unix.questions:1628 comp.unix.wizards:1677

>Did you know that when a process group leader exit()'s, all of the members
>of that group get SIGHUP's?

Yup.

>I found this in the Xenix 3.0 kernel.  Is it standard UNIX?

It's not universal, but it's pretty standard.  System III and System
V do this; I think 4BSD does it as well, as long as "init" does a
"vhangup" call on the line.

>I don't recall it documented anywhere.

From the System V manual page EXIT(2):

	"Exit" terminates the calling process with the following
	consequences:

		...

		If the process ID, tty group ID, and process group
		ID of the calling process are equal, the SIGHUP
		signal is sent to each process that has a process group
		ID equal to that of the calling process.