Peter Toft: Finde C/C++ fejl med valgrind -> massif finder fejl i allokering/deallokering

Peter Toft: Finde C/C++ fejl med valgrind -> massif finder fejl i allokering/deallokering: "Jeg har haft meget travlt på arbejdet de sidste par uger, især med at få releaset en stor klump kode, hvor mange har deltaget i af kode. Det kommer fra tid til anden fejl ind. Vi diskuterer langt over…"

Solid principle for SW structuring

Some solid principle for SW structuring: Solid (object-oriented design)

The internal variable $! in Bash

Great use of a Internal variable in Bash

Using $! for job control:

possibly_hanging_job & { sleep ${TIMEOUT}; eval 'kill -9 $!' &> /dev/null; }
# Forces completion of an ill-behaved program.
# Useful, for example, in init scripts. 

Eclipse encoding problems in c-build console

Jeg had the problem a bow with eclipse c-build console. I found a solution in this post

The solution is to set the LANG environment variable for gcc to en_US.ISO-8859-1.

ruby rmodbus serialport

I like to use ruby for make test. On some project I must use a serial modbus for testing. For that rmodbus is a fine lib. However the installation of it on windows can be a little tricky because the serialport lib has to be compiled. Here is how it done.

Install ruby with the one click installer:
http://rubyinstaller.org/

Then install the DevKit for ruby
http://rubyinstaller.org/add-ons/devkit/
http://github.com/oneclick/rubyinstaller/wiki/Development-Kit

run these commands in the directory in which DevKit has been extracted:

ruby dk.rb  init

ruby dk.rb install

The rmodbus lib is located the
http://rmodbus.heroku.com/
http://github.com/flipback/RModBus

Installation is however quite simple:
gem install rmodbus

Nuttx

An Open source RTOS, based on a micro kernel design and licensed under BSD. That sounds cool: http://nuttx.sourceforge.net/

ifconfig output

What does all the counters in the ifconfig output mean? e.g. frame, dropped... this page describe some of them.

eth1      Link encap:Ethernet  HWaddr 02:83:13:02:24:00
          inet addr:192.168.20.13  Bcast:0.0.0.0  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2169 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1769 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1009774 (986.1 KiB)  TX bytes:210912 (205.9 KiB)