Re: problem with ns2.1b3 -- namtrace-all

[Haobo Yu <haoboy@isi.edu>]

Hi, 

We've found a problem about nam trace generation in trace.cc. It's caused
by sprintf's handling of a null pointer. In some platform, sprintf seems  
to ignore a null pointer, while in other, it causes a seg fault.

Please look at
http://www-mash.cs.berkeley.edu/dist/archive/ns-users/9807/0117.html
for a solution. 

- Haobo

On Mon, 20 Jul 1998, Polly Huang wrote:

> 
> Arnaud,
> 
> A new set of validation test (session simulations) was added to the ns2.1b3 
> July 11 release.  The test outputs have to be generated by namtrace-all 
> because trace-all (most multicast validation tests use) doesn't support 
> tracing for session simulations.  namtrace-all works fine for some of us 
> but apparently not all.  Could you describe the hardware and os you're  
> using?  Also, are there others encounter the same problem with the 
> session tests?
> 
> Commenting out namtrace-all only avoids the segmentation fault.
> I hope the validation test still alarms you with 'some tests fail'.
> 
> Regards,
> -Polly
> 
> On Mon, 20 Jul 1998, Arnaud Legout wrote:
> 
> > Hi,
> > I have just install ns2.1b3 with tcl/tk 8.0p2, otcl-1.0a3, tclcl-1.0b6.
> > when I run the following script (see [1]) with my old ns2.1b3-current
> > (of the june 25, 98 installed 
> > with tcl/tk 8.0p2, otcl-1.0a2, tclcl-1.0b5), I have no problem. But when
> > I run the same script
> > with ns-2.1b3 (released 11-July-98) I have a segmentation fault error.
> > If I comment the line with namtrace-all I have no more error.
> > 
> > Any ideas?
> > 
> > Thanks,
> > Arnaud.
> > 
> > [1] : the script is :
> > 
> > set ns [new Simulator]
> > 
> > set n1 [$ns node]
> > set n2 [$ns node]
> > 
> > $ns namtrace-all [open out.nam w]
> > 
> > $ns duplex-link $n1 $n2 100kb 0.05s DropTail
> > 
> > set tcp_source1 [new Agent/TCP]
> > set tcp_sink1 [new Agent/TCPSink]
> > $ns attach-agent $n1 $tcp_source1
> > $ns attach-agent $n2 $tcp_sink1
> > $ns connect $tcp_source1 $tcp_sink1
> > set ftp1 [$tcp_source1 attach-source FTP]
> > 
> > $ns at 1.0 "$ftp1 start"
> > 
> > $ns at 50.0 "exit 0"
> > 
> > $ns run
> > 
> > -- 
> > ----------------------------------------------------------------------
> > Arnaud Legout
> > 
> > Institut Eurecom               	Phone : 00.33.4.93.00.26.61
> > 2229, route des Cretes         	Fax   : 00.33.4.93.00.26.27
> > BP 193                         	E-mail: Arnaud.Legout@eurecom.fr
> > 06904 Sophia Antipolis cedex    Web   : http://www.eurecom.fr/~legout    
> > FRANCE                    
> > ----------------------------------------------------------------------
> > 
>