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Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!wuarchive!uunet!matrix!hari
From: hari@matrix.UUCP (T hariharan)
Newsgroups: comp.windows.open-look,comp.windows.x
Subject: XView bug
Keywords: xview, bug
Message-ID: <833@matrix.UUCP>
Date: 24 Apr 91 22:34:52 GMT
Organization: Matrix Computer Systems, Nashua, NH
Lines: 68

There seems to be a bug in xv_init() which causes your program to crash.
The following minimal progam (see below) crashes if the following conditions
are satisfied:

1. The X server should NOT be running on the machine where you run the
   program

2. You should NOT have the environment variable DISPLAY defined, and
   you should NOT use the -diplay command line option

All you have to do is log into a machine's console and run the program
wihtout starting X.  You can also rlogin into a machine where the X server
is not running.

If the X server IS running, the program does not crash, even if DISPLAY
is not defined and -display is not used on the command line.

Also, if the X server is NOT running, and DISPLAY is defined, you get
an error message (can't connect to server xxx) instead of a crash.

We would like to let xv_init() establish the connection with the server
without having to use XOpenDisplay() ourselves, and of course, not have
the program crash in the above case.

Any ideas for a workaround for this bug ?
Has anyone seen this bug before (I would expect someone to have) ?

Please email your responses to me. I'll summarize.

Thanks,
Hari

uunet!matrix!hari
Matrix Computer Systems, Inc.
1 Tara Boulevard
Nashua  NH  03062
(603) 888 7790

========================================================================
Command to compile program:
cc -g -I/usr/openwin/include -L/usr/openwin/lib -o bug bug.c -lxview -lX

If you have openwin installed somewhere other than /usr/openwin, please
substitute your openwin directory for /usr/openwin.

Also, you may have to use "-lX11" instead of "-lX" above if libX.a is not
a link to libX11.a on your system.

========================================================================
Program:

/* Save from here to end in bug.c */
#include <stdio.h>
#include <sys/param.h>
#include <sys/types.h>
#include <xview/xview.h>

void
main(argc, argv)
	int		argc;
	char		**argv;
{
	/*
	 * Initialize XView.
	 */
	xv_init(XV_INIT_ARGC_PTR_ARGV, &argc, argv, 0);
	exit(0);
}