Re: [TCLUG:3532] help with gtk program

["Shawn T . Amundson" <amundson@gimp.org>]

Only do GTK+ code on one thread. 

The best way to organize this would probably be to open up a pipe,
fill it in a non-gtk thread and read it in the gtk thread when idle, so
a gtk_idle_add() call.  I haven't really done any thread programming. 

Also, setting a GTK+ program setuid is strongly discouraged, so don't
do it.  How about just parsing traceroute output?  Or creating a second
binary which does just what you want, and open that and work with it.
Or just be really careful and get rid of root privilages before you do
any GTK code.  

-Shawn

On Mon, Jan 18, 1999 at 05:11:35PM -0600, Sandipan Panigrahi wrote:
> Hi, 
> 
> I was playing with gtk and came up with a little
> program that takes sitenames/ip addresses as input
> and calculates round trip times and hops to the
> destinations.
> 
> The round trip/hops code I borrowed from the ping and
> traceroute source. This runs on a thread of its
> own, scheduling icmp packets to be sent to each
> destination every so often and also receiveing return icmp
> packets. 
> 
> Each icmp packet it recieves it updates a CLIST in GTK. 
> 
> The problem is that the CLIST does not get refreshed
> as soon as the data is written to the screen, but seems
> kind of at random. I have a feeling this is because the data
> is getting updated from an external thread and not from
> within the gtk main loop control.
> 
> So I would like to know any way I can implement this ?
> One way would be I guess to emit user defined signals from 
> the other thread instead of just calling the gtk functions.
> 
> This is just a program I have been using to learn gtk and
> one possible use of this was to see if I could do a search
> for a file from a site like ftpsearch.lycos.com/ and
> then try locate the best site for download. 
> 
> I do not think that a round trip time and a hop count will
> be enough to decide on which is a good place to download from
> but I was wondering if it was possible to get some estimate from
> them. It would be nice if I could also figure out a way to 
> find out the bandwidth and load of the server to help decide
> a good download site in addition to round trip and hops.
> 
> Appreciate any ideas/help. 
> Oh and you can download the code and try it out if you like from
> (binary from) http://www.frontiernet.net/~pani/probe
> (source from) http://www.frontiernet.net/~pani/probe-0.1.tar.gz
> 
> Also this has to be run as root, because it opens raw ports
> which as I understand from the traceroute code can be done
> only by root. So use very carefully if you must. Also any ideas
> on how I can avoid having to run this as root this would be great !
> 
> Thanks,
> sandipan
> 
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--
Shawn T. Amundson               
amundson@gimp.org               http://www.gimp.org/~amundson

"The assumption that the universe looks the same in every
 direction is clearly not true in reality." - Stephen Hawking