Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!usenet.ins.cwru.edu!Bach!doleh
From: doleh@Bach.CES.CWRU.Edu (Yasser Doleh)
Newsgroups: comp.windows.x
Subject: Re: Tek mode gives bus error...
Message-ID: <1990Feb22.233105.27158@usenet.ins.cwru.edu>
Date: 22 Feb 90 23:31:05 GMT
References: <9002211946.AA14655@ATHENA.MIT.EDU>
Organization: CWRU Dept of Computer Engineering and Science
Lines: 40

In article <9002211946.AA14655@ATHENA.MIT.EDU> DEG41560@UA1VM.BITNET (Rob Smith) writes:
>Hi,
>Everything seems to work now (rather well, too),
>except that I cannot get Tek mode in xterm (neither from the menu,
>escape sequences (generated by MATLAB), or from a command line option).
>WhenI try for Tek mode, I get a Bus Error (nothing more informative than that).
>Has anyone else had this problem? Do I need to recompile the whole
>distribution? Users around here need Tek Mode for MATLAB, so I've got to
>fix it before I convert all the machines to R4.

	We had the same problem. In the file Tekproc.c around line
1289 there is the following code:

    if (tw->tek.initial_font) {
	    char *s = tw->tek.initial_font;
		    
	    XmuCopyISOLatin1Lowered (s, s);

The function XmuCopyISOLatin1Lowered tries to modify the string s which 
has a default value the constant s. gcc make all string constants read only.
This is where xterm fail. To solve the problem:

1 - compile Tekproc.c using gcc -fwritable-strings
2 - modify Tekproc such that the you pass an array to XmuCopyISOLatin1Lowered
	instead of the string constant.

3 - A temprory solution will be in /usr/lib/X11/app-defaults/XTerm
	put the following line 

	*tek4014*initialFont:   large

	which make the value on s above a variable not the default string
	constant.

I did not know which is better ? modify the Imakefile to compile Tekproc
with -fwritable-strings ? or modify Tekproc.c ? What the xperts say about
that ?

Thanks
doleh@math-cs.kent.edu