Tap don't work on DCE

[gian]

Hi,
I developed a script that use the tap-bridge device, configured in "UseBridge" mode, that running perfectly in NS-3.18.
But the same script crash if execute in DCE-1.1. It generate this log:
....
msg="TapBridge::CreateTap(): Back from execlp(), errno = No such file or directory", file=../src/tap-bridge/model/tap-bridge.cc, line=523
terminate called without an active exception
msg="TapBridge::CreateTap(): socket creator exited abnormally", file=../src/tap-bridge/model/tap-bridge.cc, line=550
terminate called without an active exception
Command ['/home/scnl_user/workspace/dce/source/ns-3-dce/build/myscripts/dce-lte-wifi/bin/lte-epc-wifi-test'] terminated with signal SIGIOT. Run it under a debugger to get more information (./waf --run <program> --command-template="gdb --args %s <args>").

Why?!? could I have some help, please?

[Hajime Tazaki]

this is probably an issue of DCE, which I have no quick fix
or ideas at this moment.

I will try to find a solution. If you find the way to fix
it, i'm happy to know that.

-- Hajime

At Tue, 24 Sep 2013 07:08:28 -0700 (PDT),
gian wrote:
>
> [1 <text/plain; ISO-8859-1 (7bit)>]

[Hajime Tazaki]

I've filled a bug entry.

https://www.nsnam.org/bugzilla/show_bug.cgi?id=1765

two things are needed to be fixed; you can try it before
merging the fix in the latest code repository.

* --enable-sudo option is missing in ns-3-dev, ns-3.18
module in bakeconf.xml. add the option in bakeconf.xml.

* in dce-1.1 with ./waf under ns-3-dce directory, missing
PATH variable failed to lookup tap-creator. add PATH
variables with (bake buildroot)/build/bin directory.


-- Hajime

At Wed, 25 Sep 2013 16:41:07 +0900,

[gian]

Thanks Hajime.
I try your fix.

Bye.
    Giancarlo

[gian]

Hi Hajime,
I have implemented the first fix that you have suggested... but I don't understand how to implement the second fix :-|
Could explain more this part, please ?

      Giancarlo


Il giorno giovedì 10 ottobre 2013 02:17:01 UTC+2, Hajime ha scritto:

[Hajime Tazaki]

At Wed, 30 Oct 2013 07:51:35 -0700 (PDT),

gian wrote:
>
> Hi Hajime,
> I have implemented the first fix that you have suggested... but I don't
> understand how to implement the second fix :-|
> Could explain more this part, please ?

I've uploaded the proposed patch for this fix. could you try
to patch it to ns-3-dce and build via bake again (if
possible) ?

https://www.nsnam.org/bugzilla/show_bug.cgi?id=1765

thanks.

-- Hajime

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[gian]

Hi Hajime,
your patch work well and in addition with your first fix ( --enable-sudo) is possible use the tap device. Thanks.

But now I have another issue: I must use NS3 simulation in realtime. How can I enable the "optimize" mode with DCE?

     Giancarlo

[Hajime Tazaki]

It's tricky (meaning should be documented) but you can. 

./waf configure --prefix=`pwd`/../../build --enable-static --enable-opt --prefix=$INSTALLDIR --with-ns3=$INSTALLDIR --with-elf-loader=$INSTALLDIR/lib --enable-kernel-stack=`pwd`/../net-next-sim-2.6.36/arch 

Then build it. 

We're using the following script for the daily test of optimized and static build. 

 

http://code.nsnam.org/jenkins/file/aec9f76002c8/daily-dce/script

-- Hajime

[gian]

Now It works all.
The suggested script it was very useful; in the configuration of waf  I do not include the directive --enable-static.
Thank you very much.

     Giancarlo

[Mohammad Abu Shattal]

Hello Gian,

Would you please direct me to tap bridge ns3 example that works for you.

regards,

Mohammad

[sen]

Hi,

I have the same question.

My script works well if I run it using the way "./waf --run myprojects/My/myapp"

I want to run it without the ns3 source code. So I execute it directly like the other C++ program using the way "./build/myprojects/My/ns3.19-myapp-debug". This way always ok in the other ns3 programs.

Unfortunately, it crash this time. It generate this log:

msg="TapBridge::CreateTap(): Back from execlp(), errno = No such file or directory", file=../src/tap-bridge/model/tap-bridge.cc, line=511

terminate called without an active exception

msg="TapBridge::CreateTap(): socket creator exited abnormally", file=../src/tap-bridge/model/tap-bridge.cc, line=538

terminate called without an active exception

could I have some help, please?

在 2013年9月24日星期二 UTC+8下午10:08:28，gian写道：