how to resolve segmention fault ...

[Vijayan Ramakrishnan <vramakri@cs.uiowa.edu>]

 I tried running the example tcl scripts in NS distribution 

   ns/tcl/ex/newmcast/cmcast.tcl
   ns/tcl/ex/newmcast/cmcast-spt.tcl

 and I got a segmentation fault and I couldn't resolve this ..
 And other examples are running fine. 

 Can someone throw some light ? I have attached the files

- vj
_______________________________________________________________________

                          Vijayan Ramakrishnan
                    http://www.cs.uiowa.edu/~vramakri

 Dept of Computer Science                 810 W.Benton Street #216
 University of Iowa                       Iowa City, IA 52246
 Ph: 319 335 4677                         Ph: 319 358 2954
_______________________________________________________________________

source /usr/local/ns-allinone-2.1b5/ns-2.1b5/tcl/lib/ns-default.tcl
source /usr/local/ns-allinone-2.1b5/ns-2.1b5/tcl/ctr-mcast/CtrMcast.tcl
source /usr/local/ns-allinone-2.1b5/ns-2.1b5/tcl/ctr-mcast/CtrMcastComp.tcl
#
# tcl/ex/newmcast/cmcast.tcl
#
# Copyright (C) 1997 by USC/ISI
# All rights reserved.                                            
#                                                                
# Redistribution and use in source and binary forms are permitted
# provided that the above copyright notice and this paragraph are
# duplicated in all such forms and that any documentation, advertising
# materials, and other materials related to such distribution and use
# acknowledge that the software was developed by the University of
# Southern California, Information Sciences Institute.  The name of the
# University may not be used to endorse or promote products derived from
# this software without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
# 
# Contributed by Polly Huang (USC/ISI), http://www-scf.usc.edu/~bhuang
# 
#
# Centralized Multicast Module Examples
# o. Use default RP tree(share tree) at first, then switch
# o. RP related settings are required, such as C_RP, C_BSR, compute-rpset,...
#
# joining & pruning test(s) 
#          |3|
#           |
#  |0|-----|1|
#           |
#          |2|
set ns [new Simulator]
$ns multicast

set n0 [$ns node]
set n1 [$ns node]
set n2 [$ns node]
set n3 [$ns node]

set f [open out-cmcast.tr w]
$ns trace-all $f
set nf [open out-cmcast.nam w]
$ns namtrace-all $nf

$ns color 2 black
$ns color 1 blue
$ns color 0 yellow
$ns color 30 purple
$ns color 31 green

$ns duplex-link $n0 $n1 1.5Mb 10ms DropTail
$ns duplex-link $n1 $n2 1.5Mb 10ms DropTail
$ns duplex-link $n1 $n3 1.5Mb 10ms DropTail

$ns duplex-link-op $n0 $n1 orient right
$ns duplex-link-op $n1 $n2 orient right-up
$ns duplex-link-op $n1 $n3 orient right-down

$ns duplex-link-op $n0 $n1 queuePos 0.5
$ns duplex-link-op $n1 $n0 queuePos 0.5
$ns duplex-link-op $n3 $n1 queuePos 0.5

set mproto CtrMcast
set mrthandle [$ns mrtproto $mproto {}]

set udp0 [new Agent/UDP]
$udp0 set dst_ 0x8003
$udp0 set class_ 1
$ns attach-agent $n2 $udp0
set cbr0 [new Application/Traffic/CBR]
$cbr0 attach-agent $udp0

set rcvr0 [new Agent/Null]
$ns attach-agent $n0 $rcvr0
set rcvr1 [new Agent/Null]
$ns attach-agent $n1 $rcvr1
set rcvr2  [new Agent/Null]
$ns attach-agent $n2 $rcvr2
set rcvr3 [new Agent/Null]
$ns attach-agent $n3 $rcvr3

$ns at 0.2 "$cbr0 start"
$ns at 0.3 "$n1 join-group  $rcvr1 0x8003"
$ns at 0.4 "$n0 join-group  $rcvr0 0x8003"
$ns at 0.45 "$mrthandle switch-treetype 0x8003"
$ns at 0.55 "$n3 join-group  $rcvr3 0x8003"
$ns at 0.65 "$n2 join-group  $rcvr2 0x8003"

$ns at 0.7 "$n0 leave-group $rcvr0 0x8003"
$ns at 0.8 "$n2 leave-group  $rcvr2 0x8003"
$ns at 0.85 "$mrthandle compute-mroutes"
$ns at 0.9 "$n3 leave-group  $rcvr3 0x8003"
$ns at 1.0 "$n1 leave-group $rcvr1 0x8003"

$ns at 1.1 "finish"

proc finish {} {
        global ns
        $ns flush-trace
        #exec awk -f ../../nam-demo/nstonam.awk out-cmcast.tr > cmcast-nam.tr
        # exec rm -f out
        #XXX
        puts "running nam..."
        exec nam out-cmcast &
        exit 0
}

$ns run