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From: bzs@bu-cs.UUCP
Newsgroups: comp.unix.questions,comp.unix.wizards,comp.lang.c
Subject: Re: Filtering Everything
Message-ID: <6489@bu-cs.BU.EDU>
Date: Mon, 13-Apr-87 22:40:58 EST
Article-I.D.: bu-cs.6489
Posted: Mon Apr 13 22:40:58 1987
Date-Received: Wed, 15-Apr-87 04:27:51 EST
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In-reply-to: mcvoy@rsch.WISC.EDU's message of 13 Apr 87 17:29:18 GMT
Posting-Front-End: GNU Emacs 18.41.4 of Mon Mar 23 1987 on bu-cs (berkeley-unix)


>I was wondering about this... I've never used sxt's (pc7300 doesn't run 5.3)
>so I don't know what the diffference is.   Can't you use them just like
>ptty's?  If I wanted to write an application that preprocesses tty input
>but is transparent to applications underneath it, can I do that?  I.e., 
>a history filter for sh (for those w/o [c|k]sh)...
>-- 
>Larry McVoy 	        mcvoy@rsch.wisc.edu  or  uwvax!mcvoy

Actually, sxt's were in the 5.2 release, so your 7300 is still somewhere
around 5.1.

No, sxt's are more like a form of job control. You switch one terminal
among processes via some ioctl's. The others get blocked on input.
Don't be confused by the similarity of the names (is there one?) More
like a window system controlling who is the current tty input window
by clicking a window with the mouse (and guess what it was used for!)

	-Barry Shein, Boston University