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Posting-Version: version B 2.10.1 6/24/83; site fortune.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!ihnp4!fortune!grw
From: grw@fortune.UUCP (Glenn Wichman)
Newsgroups: net.games.rogue
Subject: Re: On posted fix for "saved game bug"
Message-ID: <3931@fortune.UUCP>
Date: Thu, 2-Aug-84 17:02:36 EDT
Article-I.D.: fortune.3931
Posted: Thu Aug  2 17:02:36 1984
Date-Received: Sat, 4-Aug-84 00:45:23 EDT
References: <274@tymix.UUCP>
Organization: Fortune Systems, Redwood City, CA
Lines: 41

bip.
> Regarding the "saved game bug"  the following has been posted:

>> ....
>> Guys, under 4.2BSD, ^Y is a delayed suspend signal.  ^Y  also  means
>>UP LEFT to rogue.  If you get a ^Y through the game to the shell...

>Probably the reason people keep complaining is that they don't understand
>your "fix" or why it applies to the problem. Many people play Rogue who
>know very little about Unix, shell script, suspend signals, and so on. You
>may feel that such persons ought not to be playing Rogue, but, there they
>are. 

>For example, I understand that control-Y has two meanings in two different
>contexts, and I understand what a shell script is, but I am totally
>baffled by your assertion that "If you get a ^Y through the game to the
>shell".  What the H*** does this mean?...

	Well, it doesn't mean anything, actually.  [This next part is
    to the '>>' guy].  The shell isn't the thing that catches ^Ys,
    the tty driver is.  And the ^Y doesn't get "through the game to
    the shell", it never gets to the game in the first place.
	In simple terms:  In UNIX, a part of the kernel called the
    "tty driver" interprets the characters you type.  Usually, these
    are just ASCII characters that the tty driver sends on to the
    program waiting for input, however, a couple of charcters are
    special, for instance the interrupt character.  If the tty
    driver sees this charcter come in, rather than sending it along,
    it will send an interrupt signal to the program.  Through the
    UNIX program stty, you can set your all these special charcters
    to whatever ASCII values you want.  ^Y is one of these special
    characters.  It means 'suspend this process as soon as it wants
    some input', but that's not important right now.  The purpose
    of the shell script which was suggested in the original article
    is to change that character from ^Y to something else  (I suggest
    setting it to  (^@), which is something you are unlikely
    to type accidentally).
	I'm also not convinced that that's all there is to the
    "save game" bug.

						-Glenn.