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Why is netfilter in kernel space?

Posted 04-21-2012 at 04:11 PM by Skaperen

Isn't one of the kernel design intentions to move more things to user space and keep the kernel itself smaller? I think network filtering should be one of those things.

So why haven't they done that? Is it considered too much of a performance issue to use user processes filter packets? I don't think it would be. But maybe there is some functionality missing that can be done in the kernel and not in user space?

The API would not be hard. Just create device nodes...
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NAM of ns2.23 not working

Posted 04-20-2012 at 10:43 AM by afsha2719

hi ... i installed ns-2.33 successfully but the problem is that NAM is not working. when i run a tcl script it gives an error :

[root@localhost programs]# ns 5nodes.tcl
ns: finish: couldn't execute "nam": permission denied
while executing
"exec nam out.nam &"
(procedure "finish" line 6)
invoked from within

my OS is fedora 16
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GUI coding. A peek at run-time inheritance (method lookups)

Posted 04-20-2012 at 09:23 AM by rainbowsally
Updated 04-20-2012 at 09:26 AM by rainbowsally

GUI coding. A peek at run-time inheritance (method lookups)

In previous blog entries we built QT's example/desktop/screenshot application and did a bit of tracing with a debugger.

Let's take a look at the metaobject definition file (moc_screenshot.cpp) next.

This is where QT implements a class' method inheritance. It looks up 'methods' from the widget's parent first, then if parent doesn't handle the '_id' we try it here, and if we don't handle it...
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Views 300 Comments 0 rainbowsally is offline

New digital tune / gFifteen version 1.0

Posted 04-20-2012 at 02:34 AM by hydraMax (Bits and Pixels)

I finally was able to get a power adapter for my old CASIO keyboard, plus a MIDI adapter. With that and some RG editing I was able to produce this little tune: (Ogg Vorbis) (Mp3)


This is somewhat old news, but I should mention that gFifteen version 1.0 is available, with three additional tile sets for variety. Debian packages are available for...
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Views 328 Comments 0 hydraMax is offline

Master Command history in Linux Bash

Posted 04-19-2012 at 08:16 PM by stretchedthin
Updated 04-19-2012 at 09:35 PM by stretchedthin

Before you learn any commands in Linux, get to know how you can make the most of the history functions in Bash. This will save you and your fingers a lot of wear and tear. Learning this and making sure your working in a terminal emulator that has good copy past functionality and your going to find the command line a pretty comfortable place.
Master Command history in Linux Bash
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