[GRASS5] nviz problem

[Bob Covill]

Hi,

This is an interesting one. If I execute something like "nviz -q &", nviz
starts up normally with the wish (%) prompt. If I hit enter at the prompt I
am returned to the normal command line prompt and can run other commands
(while nviz is running). When I quit nviz I get the respone on the command
line ...
[1]+  Done                    nviz -q
which is what I would expect from a command that has been running in the
background.

Out of curiousity try creating a simple startup script with the following:

#!/bin/sh
exec nviz "$0" "$@"

Make it executable and try running it in the background. For example if you
name the script nv_start.sh, try "nv_start.sh elev=dem &" and see if that
works.

--
Bob


On 12/18/2004, "Huidae Cho" <grass4u at gmail.com> wrote:

>Interesting!
>
>Is wish running in background? As I know, a shell-like program cannot be
>running in that way because if it's bg'ed or run with "&", /bin/sh or
>the login shell takes control of stdin so that users can stay in the login
>shell.
>
>If it's executed by a script, then it's ok because it's a usual shell
>script.
>
>Do you mean running "nviz" and executing other programs in the "%" nviz
>prompt instead of running "nviz &"?
>
>If wish is running in background (wish &), how can you execute wish
functions?
>
>
>Thank you.
>Huidae Cho
>
>
>On Sat, Dec 18, 2004 at 01:22:50PM +0000, Bob Covill wrote:
>>
>> Hi,
>>
>>
>>
>> It appears that not even wish will run in the background on your system
...
>>
>> very strange.
>>
>>
>>
>> The current nviz IS the old NVWISH executable which was called was called
by
>>
>> the old nviz shell script. The reason I got rid of the shell script was
>>
>> because when nviz encountered an error the same un-informitive message
was
>>
>> generated because it was passed through the script. Also, there are a
number
>>
>> of error catches in the actual nviz tcl scripts which were completely
ignored
>>
>> with the old shell startup.
>>
>>
>>
>> Before reverting to the old startup it would be nice to know why wish
(and
>>
>> nviz) will not run in the background on some systems. On both of my
RedHat
>>
>> systems it runs fine both in the background and the foreground.
>>
>>
>>
>> --
>>
>> Bob
>>
>>
>>
>> On 12/18/2004, "Huidae Cho" <grass4u at gmail.com> wrote:
>>
>>
>>
>> >Hi,
>>
>> >
>>
>> >Now nviz is not a *wish script but a shell itself. That's why it prints
>>
>> >a prompt and we cannot execute it background and inside "d.m &". To fix
>>
>> >this problem, I think we should go back to NVWISH because running nviz
>>
>> >foreground is pain.
>>
>> >
>>
>> >You can test this:
>>
>> >
>>
>> >	wish &
>>
>> >
>>
>> >prints % prompt and just stop!
>>
>> >
>>
>> >Huidae Cho
>>
>> >
>>
>> >
>>
>> >On Fri, Dec 17, 2004 at 09:02:39PM -0400, Bob Covill wrote:
>>
>> >> Hello,
>>
>> >>
>>
>> >> I tried running the latest version of nviz in the background with
>>
>> >> various options and it seems to work fine. The "%" prompt that you see
>>
>> >> is perfectly normal. The nviz program is simply a customized version
of
>>
>> >> the Tcl/Tk "wish" executable. Try executing "wish" on the command line
>>
>> >> and you should see the same prompt.
>>
>> >>
>>
>> >> As for it crashing when it is run in the background, I have no idea.
You
>>
>> >> might try changing GRASS_MESSAGE_FORMAT environment variable to see if
>>
>> >> that has any effect.
>>
>> >>
>>
>> >> It might help to know what platform and Tcl/Tk version it is failing
on.
>>
>> >>
>>
>> >> For me it works on RedHat 7.3 with Tk8.3, and RedHat 9 with Tk8.4.
>>
>> >>
>>
>> >> --
>>
>> >> Bob
>>
>> >>
>>
>> >>
>>
>> >> Helena wrote:
>>
>> >> >Huidae Cho wrote:
>>
>> >> >
>>
>> >> >>Hi,
>>
>> >> >>
>>
>> >> >>I noticed today that nviz doesn't work if I run it background as
>>
>> before.
>>
>> >> >>Similarly, it just stops after displaying a map when it's executed
from
>>
>> >> >>"d.m &" which is recommended in the welcome message.
>>
>> >> >>
>>
>> >> >>nviz elevation=dem &    # doesn't work
>>
>> >> >>d.m &            # nviz doesn't work
>>
>> >> >>
>>
>> >> >>nviz elevation=dem    # works!
>>
>> >> >>d.m            # nviz works!
>>
>> >> >>
>>
>> >> >>And I see nviz prints % prompt. Does anyone have a clue?
>>
>> >> >
>>
>> >> >
>>
>> >> >It must be the latest change that was done - I just tried it and it
>>
>> >> >does not work even if I do nviz elevation=dem, it displays the DEM
>>
>> >> >but fails to open the Main pannel and prints a % prompt.
>>
>> >> >It worked OK just a few days (weeks?) ago.
>>
>> >> >It may be related to the change in the startup script - Bob, are you
>>
>> >> >around? How does it work for you?
>>
>> >> >
>>
>> >> >Helena
>>
>> >> >
>>
>> >> >>
>>
>> >> >>Thanks.
>>
>> >> >>Huidae Cho
>>
>> >> >>
>>
>> >> >>_______________________________________________
>>
>> >> >>grass5 mailing list
>>
>> >> >>grass5 at grass.itc.it
>>
>> >> >>http://grass.itc.it/mailman/listinfo/grass5
>>
>> >> >
>>
>> >> >
>>
>> >
>>
>> >
>
>_______________________________________________
>grass5 mailing list
>grass5 at grass.itc.it
>http://grass.itc.it/mailman/listinfo/grass5
>
>