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From: shap@sfsup.UUCP
Newsgroups: comp.sys.mac
Subject: Re: Mac II (really SE: A letdown?)
Message-ID: <1226@sfsup.UUCP>
Date: Wed, 18-Mar-87 21:03:59 EST
Article-I.D.: sfsup.1226
Posted: Wed Mar 18 21:03:59 1987
Date-Received: Fri, 20-Mar-87 05:23:26 EST
References: <2834@jade.BERKELEY.EDU>
Organization: AT&T-IS, Summit N.J. USA
Lines: 20
Summary: Job control NOT in Sys V

In article <2834@jade.BERKELEY.EDU>, defron@tart6.UUCP writes:
> 
> Look, job control is not something that is specific to versions of UNIX, but
> rather which terminal driver you are using.
> 
> It is very possible for Sys V shells to have job control.  Ksh is a prime
> example.  I believe A/UX comes with sh, csh and ksh.
> -
>      Daniel Efron

Sorry, Daniel, but this simply isn't true. In addition to the terminal
driver interface, you need to define an additional signal, on berkeley
called SIGTSTP. Many programs (e.g. all screen oriented programs) need
to understand it. Adding the system call correctly means doing kernel
changes in Sys V.

The Korn Shell does not do job control on System V. It could be rewired
to implement the shell-layers functionality, but it does not at this time.
Shell layers isn't really job control, as you well understand. Ksh only
has job control when running on a Berkeley or Research system.