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From: jpn@teddy.UUCP
Newsgroups: net.unix-wizards
Subject: Re: UNIX Futures
Message-ID: <2417@teddy.UUCP>
Date: Thu, 3-Apr-86 08:34:33 EST
Article-I.D.: teddy.2417
Posted: Thu Apr  3 08:34:33 1986
Date-Received: Wed, 9-Apr-86 07:18:15 EST
References: <67@cstvax.UUCP> <2864@amdahl.UUCP> <137@myab.UUCP> <6534@utzoo.UUCP> <1524@wucs.UUCP>
Reply-To: jpn@teddy.UUCP (John P. Nelson)
Organization: GenRad, Inc., Concord, Mass.
Lines: 12

> > > >A program cannot catch '^Z'. This implies that 'vi' doesn't redraw its
> > > >screen.
>A program can catch ^Z, by  ``signal(SIGTSTP, stop_handler)''.
>Further, the program can also catch the continue -- which lets it redraw the
>screen or print a message or change its state or whatever.  I have several
>programs which do both.

I sure wish people would read before flaming.  The original article was
talking about SHELL LAYERS "shl" which is a System V poor imitation of
Berkeley job control.  Under Shell Layers, a ^Z (or equivalent keystroke)
passes the terminal input to a different program, but the program that was
intercepted is not told, and is NOT EVEN STOPPED (output will continue).