Path: utzoo!utgpu!attcan!uunet!ingr!myoung
From: myoung@ingr.UUCP (Mark Young)
Newsgroups: comp.windows.x
Subject: Re: twm 4.0 grabbing all keys
Summary: Possible pointer to the problem.
Message-ID: <2880@ingr.UUCP>
Date: 9 Nov 88 20:02:09 GMT
References: <2593@uhccux.uhcc.hawaii.edu>
Organization: Intergraph Corp. Huntsville, Al
Lines: 38

In article <2593@uhccux.uhcc.hawaii.edu>, xacct@uhccux.uhcc.hawaii.edu (X-Windows Account) writes:
> 
> Running twm 4.0, the version that appeared in comp.sources.x in
> September, under R2, SunOs 3.5, I find I cannot type into a window.
> Keys are pressed -- nothing happens.
>
> 		Greg, lee@uhccux.uhcc.hawaii.edu

I tracked down a problem like this with our twm, xterm and server.

It seemed as though keystrokes were heading for the bitbucket.  I localized
the problem down the .twmrc file.  It was that I had line like:

	"Clear" = : window : f.winrefresh

when twm would parse this line, it would request the keysym and keycode for
the "Clear" key.  Unfortunatly, when I had defined the keytab for the server,
I didn't define any key as the "Clear" key.

In menus.c, the function AddFuncKey() calls XStringToKeysym() to get the 
keysym from from the string "Clear".  I think that you get a good keysym,
but when you call XKeysymToKeycode() a few lines down, since there is no
keycode associated with the keysym, you get a zero back.  Later, twm calls
GrabKeys() which in turn calls XGrabKey() passing a zero as the keycode to 
grab.  The problem is that XGrabKey() accepts 0 (#define AnyKey 0L) to be
an indication that you want to grab all of the keys.  Oops.

I didn't have the time to try and come up with a patch for this nasty.  Any
takers.  I guess I can go back and try if even Tom doesn't want to take a 
stab at it ;-).

			...m (easier to find than fix) young
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