Copy & Paste

GRUB2: Window 7 + Ubuntu 11.04 + CentOS 5.6

2011-06-19T11:39:00.001+08:00

THE STORIES: Window 7 install first, then the Ubuntu 11.04, and then the CentOS 5.6. This procedure makes Ubuntu entry lost. Windows 7 - for some applications support Windows 7 only... Ubuntu 11.04 - daily use CentOS 5.6 - for some jobs dedicated to CentOS/RedHat The harddisk allocated as below. $ sudo fdisk -l Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801

SVN projects in group

2011-06-02T11:46:00.000+08:00

The ARM/NetWinder Structure Alignment FAQ

2011-05-21T09:47:00.002+08:00

http://netwinder.osuosl.org/users/b/brianbr/public_html/alignment.html The ARM/NetWinder Structure Alignment FAQLast changed: 99/05/28 1) What is structure alignment? 2) Why is this an issue for ARM/NetWinder systems? 3) How is this related to the alignment trap? 4) Which distributions are affected? 5) Which compilers are affected? 6) What are the advantages of word alignment? 7) What are

Ubuntu - Font Setting

2011-05-07T09:22:00.000+08:00

Ubuntu 11.04 Lang=zh_tw.utf8 Fonts: WenQuanYi Micro Hei WenQuanYi Micro Hei Mono is ugly to me in lots of applications. Therefore I changed the font settings as below. $ su $ cd /etc/fonts/conf.d $ ln -s ../conf.avail/69-language-selector-zh-tw.conf 69-language-selector-zh-tw.conf $ vi 69-language-selector-zh-tw.conf : <

SVN change server ip at client

2011-04-15T12:31:00.000+08:00

To check current SVN server IP$ svn info Changed server IP, need to change local project IP:$ svn switch --relocate svn://OLD.IP.ADDR svn://NEW.IP.ADDR

CentOS 5.5 NFS -

2011-03-19T21:39:00.000+08:00

To enable CentOS 5.5 NFS service, # yum install nfs-utils nfs-utils-lib # vi /etc/exports /home *(rw,sync,no_root_squash,no_subtree_check) # service portmap start # service nfs start On client, you may get error messages: No route to host. # service iptables stop

e2fsprogs on Trident PNX84xx

2011-02-15T17:39:00.000+08:00

### Prepare Trident Build Environment. $ cd /home/lilin/trident/SRC/; source pnx8400_MP_env.sh; cd - $ tar zxvf e2fsprgos-1.41.14.tar.gz $ cd e2fsprogs-1.41.14 ### Read instructions on building and installing e2fsprogs. ### $ cat INSTALL : $ mkdir build; cd build ################################################ ### IMPORTANT !!! ### ### Specify the sysroot

Japan BS 120cm Dish + Taiwan DTV antenna

2011-02-01T11:09:00.001+08:00

dvd+rw-tools-7.1 on Trident pnx84xx

2011-01-28T11:54:00.000+08:00

0. Trident pnx84xx build environment is req'd ! 1. Get latest dvd+rw-tools from its officical website. # wget http://fy.chalmers.se/~appro/linux/DVD+RW/tools/dvd+rw-tools-7.1.tar.gz # tar -zxvf dvd+rw-tools-7.1.tar.gz # cd dvd+rw-tools-7.1 2. Modify the Makefile.m4 to meet our needs. # vi Makefile.m4 Search Linux section ... : ifelse(OS,Linux,[ # # Linux section # CC =

live555 on Trident pnx84xx

2011-01-28T10:25:00.000+08:00

A modified openRTSP is used to stream IPCAM video streams. Therefore, we need to port openRTSP on the new platform pnx84xx. 0. Prepare build environment for Trident pnx84xx. # cd /PATH/TO/TRIDENT/SRC # source pnx8400_MP_env.sh 1. Download live555 source from official website.Always get the latest version, and read document for installation first. # wget http://www.live555.com/liveMedia/

ntpclient on Trident pnx84xx

2011-01-28T09:43:00.000+08:00

0. Prepare trident build environment # cd /PATH/TO/TRIDENT/SRC # source pnx8400_MP_env.sh 1. Download latest ntpclient source codes from official website. # wget http://doolittle.icarus.com/ntpclient/ntpclient_2010_365.tar.gz # tar -zxvf ntpclient_2010_365.tar.gz# cd ntpclient-2010 2. Modify the Makefile for Trident pnx84xx. # vi Makefile # A long time ago, far, far away, under Solaris, you

SVN on CentOS 5.5 i386

2011-01-08T11:56:00.000+08:00

Ref: 1. Subvision on CentOS http://wiki.centos.org/HowTos/Subversion 2. http://www.ichiayi.com/wiki/tech/centosinstall Quick Guide === My Guest OS (CentOS 5.5 i386)=== 1. Install SVN # yum install mod_dav_svn subversion # vim /etc/httpd/conf.d/subversion.conf ---subversion.conf--- : LoadModule dav_svn_module modules/mod_dav_svn.so LoadModule authz_svn_module modules/

Apache2 on Ubuntu 10.10 ... cgi-bin

2010-11-27T10:31:00.000+08:00

For memo... INSTALL# sudo apt-get install apache2 TEST if Apache2 installed successfully ? It works!This is the default web page for this server.The web server software is running but no content has been added, yet. MODIFY for CGI # sudo vi /etc/apache2/apache2.conf : AddHandler cgi-script .cgi : # sudo vi /etc/apache2/sites-enabled/000-default : ScriptAlias /cgi-bin/ /var/www

TimeZone setting

2010-11-07T11:51:00.000+08:00

In our DVR, we have an option for user to decide whether Daylight Saving Time (DST) to be enabled in his machine. When Time Zone is selected in DST field, the time in Date/Time fields will be automatically adjusted accordingly. However, once the user changed the Date/Time value, the Time Zone changed later will not effect the time in Date/Time field. Ref: [1] http://www.gnu.org/software/libc/

Eclipse with BIG5 encoding codes !

2010-09-09T22:22:00.001+08:00

The old source code files are BIG5 encoded. For some reasons, we have to keep original encoding, when using Eclipse (its default encoding is UTF-8). To use BIG-5 encoding in Eclipse, try to do in this way. Figure 1. The Chinese characters in line 2073 are not shown properly. TODO: Move cursor to project name, click the right button of mouse and select the Properties [Alt+Enter] , then the

Perforce, The Fast Software Configuration Management System

2010-09-07T21:25:00.001+08:00

As introduced by my colleague, the version he used was for Windows. The linux/unix/mac versions are also available. As a Eclipse user, it's lucky to have the Perforce Plug-in for Eclipse :) http://www.perforce.com/perforce/products/p4wsad.html Keep records.

LINUX KERNEL完全剖析 - 趙炯

2010-06-22T15:09:00.001+08:00

OS: Ubuntu 10.04 We shall install both bochs and bochs-x packages first to realize further examples in this book. # sudo apt-get install bochs bochs-x boot.s .globl begtext, begdata, begbss, endtext, enddata, endbss .text begtext: .data begdata: .bss begbss: .text BOOTSEG=0x07c0 entry start start: jmpi go, BOOTSEG go: mov ax, cs mov ds, ax mov es, ax mov [

Qt - phonon

2010-05-21T15:19:00.000+08:00

VideoPlayback in Qt via Phonon 1. create a new Qt project with module Phonon ... 2. Add some codes in mainwindow.h & mainwindow.cpp --- mainwindow.h --- class MainWindow : public QMainWindow { : private: Ui::MainWindow *ui; QString m_mediaFile; Phonon::VideoPlayer *player;};--- mainwindow.cpp --- MainWindow::MainWindow(QWidget *parent) : QMainWindow(

Hello World mips version with eclipse.

2010-05-20T11:17:00.000+08:00

Project -> Properties [ C/C++ Build ] -> [ Environment ] -> [ Select... ] Select PATH. Edit the PATHAppend your toolchain binary path in value field. [ C/C++ Build ] -> [ Settings ] modify [ Command ] fields in GCC C++ Compiler/C Compiler/C++ Linker/Assembler respectively.ex: g++ -> mipsel-linux-g++ Project -> Build Project The mips version Hello World is

CMake - my first experience (1)

2010-05-19T16:28:00.001+08:00

REFERENCE: http://andescore.blogspot.com/2009/08/cmake-andes-toolchains3.html To run mySrv and myCli on mipsel platform. Add below lines in src/CMakeLists.txt and lib/CMakeLists.txt. SET(CMAKE_C_COMPILER mipsel-linux-gcc)SET(CMAKE_CXX_COMPILER mipsel-linux-g++) SET(AS mipsel-linux-as) SET(AR mipsel-linux-ar) SET(LD mipsel-linux-ld) SET(NM mipsel-linux-nm) SET(OBJCOPY mipsel-linux-objcopy) SET(

The last UI programming work - Virtual Keyboard for RTK1073/1283

2010-05-19T15:19:00.001+08:00

This may be my last UI programming works on Realtek 1073/1283. Because default virtual keyboard developed by Realtek is not good to us. Therefore, the boss decided to develop one for ourselves. It is a virtual keyboard for user to input his own PPPoE account and password. Major functions as below: 0. Key moved by direction buttons, and selected by [OK] button on RC. 1. Two input text fields (

CMake - my first experience

2010-05-18T17:30:00.002+08:00

Reference: 0. Jserv's 貓也會的 CMake http://blog.linux.org.tw/~jserv/archives/001987.html and http://jserv.sayya.org/cmake/cmake-overview.pdf 1. Drake's 把玩 CMake 的第一步 http://drakeguan.org/my_first_trial_of_cmake This is my first time with CMake. Before it starts, I have to install cmake in my Ubuntu. $ sudo apt-get install cmake Then prepare some files and directories per Drake's suggestions. *

warning: array subscript has type `char'

2010-05-12T11:13:00.000+08:00

A 'char' may be 'signed' or 'unsigned'. Most regular compilers will default to 'signed'. So if you have an array with index 127, you increment the index and it becomes -128. This may of course be your intention. A 'safe' type to use for an array index is 'int' or 'unsigned char'. char idx; /// limited range somedata[idx] = otherdata; ==> (to eliminate the warning...) unsigned char idx;

Simple Poker ?!

2010-05-10T14:53:00.002+08:00

A simple Black Jack game in linux. If you are interested in the history of poker, click below links.Reference:- http://ianjung1974.blogspot.com/2008/05/54-why.html- http://zh.wikipedia.org/w/index.php?title=扑克牌&variant=zh-tw#.E2.99.A0.E3.80.81.E2.99.A5.E3.80.81.E2.99.A3.E3.80.81.E2.99.A6.E5.9C.96.E6.A1.88.E8.B5.B7.E6.BA.90 Program output as below. ~/workspace/poker$ ./myBJ 1 2 m_magic =

Install Apache/PHP/MySQL on Ubuntu 10.04

2010-05-09T10:44:00.007+08:00

It's almost nine years since the first and also the last time I installed the Apache web server. The web services on the last server are a company calendar (schedule) and a namelist implemented by php3 and mysql. First we have to install Apache server via$ sudo apt-get install apache2 Open http://localhost/ or http://127.0.0.1/ in a web browser to check if the web server is successfully

sqlite3 - explore a .db !

2010-04-26T11:06:00.000+08:00

Got a .db and tried to find what's inside... :) $ sqlite3 realtek.db SQLite version 3.6.16 Enter ".help" for instructions Enter SQL statements terminated with a ";" sqlite> .databases seq name file --- --------------- ---------------------------------------------------------- 0 main /nfstmp/realtek.db

A simple MineSweeper on Realtek 1073/1283 board.

2010-04-21T11:02:00.001+08:00

It's just an idea to have a game on my Realtek 1073/1283 board. Preliminary version was developed on Ubuntu 9.10 to generate a random mine map. The GUI on Realtek board helps the completion of the simple game. No score, just for fun !!!

A simple calculator on Realtek 1073/1283 board

2010-04-21T10:50:00.000+08:00

The CalcAP is implemented due to a programming quiz from the team leader since the Chinese New Year. It was originally a infix expression given by user and the program shall be able to return the calculation result. The calculator shall support +-*/()^. and no other function(s) shall be used in this program. After the console version on Ubuntu 9.10 is completed, I prepared an GUI version on my

(NOTE) Java Gossip: 第一個Java程式

2010-04-12T15:44:00.001+08:00

編譯程式# javac HelloWorld.java會產生 HelloWorld.class執行程式# java HelloWorldSystem是放在java.lang的套件（package）中，但java.lang中的類別都很常用，無需特別import參考來源： "Java Gossip: 第一個Java程式"- 第一個Java程式 (在「Google 網頁註解」中檢視)

Android

2010-04-12T13:34:00.004+08:00

Installation instructions per official website of Installing the SDK | Android Developers (http://developer.android.com/sdk/installing.html) and the other reference page (http://csie-tw.blogspot.com/2008/01/androideclipse.html) makes it easier for us to complete the installation work. The HelloAndroid project with Eclipse on Ubuntu 9.10. Select [ Window ] - [ Android SDK

sscanf - parse pre-defined format string

2010-04-10T11:12:00.007+08:00

Parse a string with pre-defined format into lots of different variables. The last string shall be able to contain new line character for other purpose. :) #include int main(int argc, char **argv) { const char *str="123 456 1234567890 1333555777 Line#1 Hello World !\nLine#2 sscanf parse*0 test\nLine#3 End.\n"; int a, b; long long c, d; char e[256]; ///

linux echo command

2010-04-03T11:31:00.000+08:00

As I was requested to light up some LEDs on my board, one binary from my colleague was used. But I tried in this easy way... 11111100 (bin) > 0374 (oct) The last two bits stand for two LEDs. box# echo -e \\0374 > /dev/gpio0

Ubuntu Notification Window + crontab

2010-04-03T11:24:00.001+08:00

Hey! Want to get some news from your favorite news websites w/o click your web browser ? Try to do in this way, and hope it will not interrupt your boring work. Ccc... FIRST, you shall write a simple shell script to parse the news RSS pages from your favorite news website.$ cat myUdnRss.sh #!/bin/sh DL_URL="http://udn.com/udnrss/latest.xml" #DL_URL="http://rss.chinatimes.com/rss/focus-u.rss"

Ubuntu Notification Window

2010-03-29T15:08:00.001+08:00

Hourly notification with GUI application $ crontab -e-----------------------------------------------------------# min hour day-of-month month day-of-week command 0 * * * * env DISPLAY=:0 /usr/bin/notify-send `date +\%H:\%M` -i /usr/share/pixmaps/gnome-set-time.png------------------------------------------------------------ref: https://help.ubuntu.com/community/CronHowto

Experience on FFmpeg

2010-02-10T11:57:00.004+08:00

1. Download ffmpeg 0.5 from official website. 2. Extract to some working folder. 3. Complie and install ffmpeg per INSTALL document. $ ./configure $ ./make $ sudo make install $ ls -al /usr/local/bin/ : -rwxr-xr-x 1 root root 5799064 2010-02-09 13:58 ffmpeg -rwxr-xr-x 1 root root 5782616 2010-02-09 13:58 ffserver : $ ls -al /usr/local/lib/ : -rw-r--r-- 1 root root

buildroot

2009-11-29T11:24:00.000+08:00

REF: http://opencsl.openfoundry.org/Lab01_intro.rst.html 1. Get the latest Buildroot ... I do in this way... svn co svn://uclibc.org/trunk/buildroot: At revision 262502. make menuconfig(a) Target Architecture ==> (X) arm(b) Toolchain ==> [*] Enable RPC(c) Target filesystem options ==> [ ] ext2 root filesystem(d) Kernel -> Kernel type ==> (X) none3. make:extra/scripts/unifdef.c:209: error:

gconf-sanity-check-2 exited with status 256

2009-11-23T22:24:00.002+08:00

Terrible !!! This morning, my Ubuntu 9.10 box message box showed 'gconf-sanity-check-2 exited with status 256' , and then I could not login my box anymore !!! But it's lucky, I could login as root. Try to look for answers from google, but none of them worked ! [1] sudo chmod 755 /etc/gconf/* [2] sudo chmod -Rc yenping:yenping /home/yenping However, case [1] gave me some ideas, and I found

Ubuntu 9.10, One Graphic Card for Dual Monitors

2009-11-14T11:00:00.005+08:00

Ubuntu 9.10 x86_64 on Intel Q8490 + Nvidia GeForce 9400GT ... the TwinView ... [SYSTEM] - [MANAGEMENT] - [NVIDIA X Server Settings] [O] X Server Information [O] GPU 0 - (GeForce 9400 GT) [O] X Server Display Configuration Found NEX T4211N disabled (in fact, it shall be CHIMEI DTL-742E400, 42" LCD TV connected via HDMI) Select Model: NEX T4211N

OpenOffice 3.1.1 Installation

2009-11-06T10:45:00.002+08:00

1. Download latest openoffice tar ball from http://download.openoffice.org/other.html 2. Extract tar ball to somewhere 3. cd somewhere/DEBS 4. sudo dpkg - i *.deb 5. cd desktop-integration 6. sudo dpkg - i *.deb 7. If something wrong with unexpected error and trying to recover Untitle 1 document again and again, just do 'rm ~/.openoffice.org', and re-install openoffice. After that,

make swap file

2009-10-27T10:32:00.001+08:00

Something found in the rcS,and try to understand what it is. --- rcS -------------------------- dd if=/Test.fat of=/dev/rd/0 mount -t vfat /dev/rd/0 /mnt/rd swapon /mnt/rd/swap.img : ---------------------------------- 1. What is /dev/rd/0 ? The RAMDISCS are placed in their own directory, and are named thus: /dev/rd/{0,1,2,...} ref: Linux Devfs (Device File System) FAQ 2. What

pthread in eclipse

2009-10-13T23:21:00.000+08:00

click Project -> Properties C/C++ Build - Settings - [Tool Settings] - GCC C++ Linker - Libraries ............. add pthread - Miscellaneous ..... add -lpthread

doxygen - Source Code Documentation Tools

2009-09-19T10:53:00.000+08:00

One day we were requested to document some source codes, and then I found Doxygen can do this well. The output formats supported are HTML, PDF, LATEX, PS, RTF, QCH, QPH, MAN... It also provides some good graph/diagram output with graphViz. You may visit them here ... Doxygen http://www.stack.nl/~dimitri/doxygen/index.html GraphViz http://www.graphviz.org/ Besides, Eclox (http://eclox.eu/)

OpenSolaries 2009.06

2009-09-15T18:06:00.005+08:00

Finally the OpenSolaries 2009.06 was successfully installed. RESOURCES: OpenSolaris Live USB Creator (Windows/.NET) GENUNIX

USB dongle detection

2009-09-10T14:48:00.004+08:00

#include #include #include #include #include #include #include #include #include #include #include #include #include #define UEVENT_BUFFER_SIZE 2048 static int init_hotplug_sock() { const int buffersize = 1024; int ret; struct

Socket Programming with Multi-Process and IPC/FIFO

2009-08-23T16:52:00.002+08:00

(later)

Socket Programming with Multi-Thread

2009-08-23T16:51:00.000+08:00

(later)

Socket Programming with I/O Multiplexing

2009-08-23T16:50:00.001+08:00

(later)

Linked List (Single/Double)

2009-07-19T23:36:00.002+08:00

=================== LINKED LIST DEMO =================== [ ] [D]-[0xbfb6b5cc]-[11]-[Albert] [ ] [D]-[0xbfb6b5f0]-[12]-[Benson] [ ] [D]-[0xbfb6b614]-[13]-[Cano ] [ ] [D]-[0xbfb6b638]-[14]-[David ] [ ] [D]-[0xbfb6b65c]-[15]-[Elvin ] [ ] [D]-[0xbfb6b680]-[16]-[Fan ] [ ] [D]-[0xbfb6b6a4]-[17]-[Gary ] [ ] [D]-[0xbfb6b6c8]-[18]-[Helen ] [ ] [D]-[0xbfb6b6ec]-[19]-[Ivan ] [ ] [D]-[0xbfb6b710]-[20

Balanced Tree

2009-07-19T23:32:00.005+08:00

AVL Balanced tree program written in C. Refer to http://en.wikipedia.org/wiki/AVL_tree. This program can display a tree structure as below. It also have a cursor which can be moved by numeric key (1-9). Cursor node is also highlight displayed :) ==================== Balance Tree (6)==================== [13](-1)----[38](-1)----[57](+1)----[90](+0)----[99](+0) | | |

getch() in Linux

2009-07-12T10:12:00.004+08:00

A good reference from http://blog.csdn.net/t_larry/archive/2006/04/06/653124.aspx #include #include #include #include /*------------------------------------------------*/ int getch(void) { int c=0; struct termios org_opts, new_opts; int res=0; //----- store old settings ----------- res=tcgetattr(STDIN_FILENO, &

Updates to Qt and Qt Creator ...

2009-06-30T09:49:00.002+08:00

On June 25, Nokia announced the release of updates to Qt. - Qt Creator 1.2 - Qt 4.5.2 Download is available at http://www.qtsoftware.com/downloads

SQLite

2009-06-23T21:50:00.002+08:00

SQLite in 5 minutes or less http://www.sqlite.org/quickstart.html

RFID Application

2009-06-23T21:29:00.007+08:00

RFID Application - SQLite + Serial/Socket Programming SQLite DB<=>logServer<=>RFID Reader(S/W)<=>RFID Reader(H/W)<=>Tag 1. Create a database for RFID Tags. 2. RFID Reader(S/W) read tag information via /dev/ttyS0.It sends the Tag ID to logServer for identification. 3. logServer receives Tag Info from RFID Reader and checks with SQLIte DB. Then feedback results to RFID Reader to take

RFID Reader - ttyS0

2009-06-21T22:22:00.003+08:00

Refererence, 1. Serial Programming Guide for POSIX Operating Systems 2. Serial Programming HOWTO (Translated) 3. Summit RFID Reader 4. QextSerialPort ... a Qt Serial Class Programmed as below, #include /* Standard input/output definitions */ #include /* String function definitions */ #include /* UNIX standard function definitions */ #include /*

Bluetooth - Programming

2009-06-03T23:51:00.002+08:00

Codes modified from Bluetooth Essential for Programmer. #include #include #include #include #include int main(int argc, char **argv) { struct sockaddr_rc addr = { 0 }; int s, status, bytes_read; char buf[1] = { 0 }; char dest[18] = "00:0B:0D:6C:36:0B"; // allocate a socket s = socket(AF_BLUETOOTH

Bluetooth - Resources

2009-06-03T22:59:00.004+08:00

Bluez is the Official Linux Bluetooth protocol stack. Bluetooth Essential for Programmer has some sample codes. An Introduction to Bluetooth Programming ...

Bluetooth - GPSlim236 GPS (2)

2009-06-03T22:22:00.006+08:00

1. Scan if any bluetooth device here ... # hcitool scan Scanning ... 00:0B:0D:6C:36:0B HOLUX GPSlim236 2. Bind the RFCOMM device to the remote bluetooth device. # rfcomm bind /dev/rfcomm0 00:0B:0D:6C:36:0B 3. Check the RFCOMM device is created or not. # ls -al /dev/rfcomm0 crw-rw---- 1 root root 216, 0 2009-06-03 21:19 /dev/rfcomm0 4. Check current RFCOMM device informaion. #

Bluetooth - GPSlim236 GPS

2009-06-03T21:24:00.009+08:00

Bluetooth is supported in Linux kernel 2.4 and 2.6. Holux GPSlim236 GPS information can be found in http://www.holux.com/JCore/en/products/products_content.jsp?pno=340 To make GPSlim236 works in Ubuntu 9.04, 1. Insert an USB Bluetooth Dongle.(D-Link DBT-122T) 2. The device shall be detected automatically by Ubuntu, and the bluetooth icon shall appear in the system tray. 3. Right click the

Google Maps API

2009-05-28T16:16:00.026+08:00

/* */ function initialize() {/* */ if (GBrowserIsCompatible()) {/* */ var map = new GMap2(document.getElementById("map_canvas"));/* */ var IOI = new GLatLng(25.0336, 121.5644);/* */ map.setCenter( IOI, 13);/* */ map.addOverlay(new GMarker(IOI));/* */ var MSG = "TAIPEI 101 @ "+ IOI ;/* */ map.openInfoWindowHtml(

nmap - port scanner

2009-05-26T22:45:00.003+08:00

When surfing internet, somebody mentioned nmap - a powerful port scanning program. $ sudo apt-get install nmap $ nmap -A localhost Starting Nmap 4.76 ( http://nmap.org ) at 2009-05-26 22:48 CST Warning: Hostname localhost resolves to 2 IPs. Using 127.0.0.1. SCRIPT ENGINE: '/usr/share/nmap/scripts/dns-test-open-recursion.nse' threw a run time error and could not be loaded. SCRIPT ENGINE: '/usr/

semaphore

2009-05-19T21:41:00.003+08:00

A simple semaphore program modified from Beginning Linux Programming 4/e. The sem_getvalue() is used to get semaphore value for test purpose only.And also the return value of a thread is given by pthread_exit() in thread function. #include #include #include #include #include #include #define SIZE 64 char work_area[SIZE];

pthread - pthread_create(), pthread_join()

2009-05-18T21:58:00.011+08:00

A simple program with threads. It also demostrates how the parameters are passed to the thread functions. #include #include #include #include #define MAX_1 5 #define MAX_2 10 /* ref: http://en.wikipedia.org/wiki/POSIX_Threads */ static void wait(void) { time_t start_time = time(NULL); while (time(NULL) == start_time) { /* do nothing

ARM Emulator by QEMU on Ubuntu 9.04

2009-05-18T18:37:00.004+08:00

From google, we know it's possible to emulate ARM in Ubuntu. First, we have to install qemu. $ sudo apt-get install qemu It seems version qemu 0.10.0. If you want to get the latest one, please link to http://www.nongnu.org/qemu/download.html. Second, we have to get an ARM image in above page or direct download from http://www.nongnu.org/qemu/arm-test-0.2.tar.gz Decompress the tarball into

No manual entry

2009-05-16T08:44:00.004+08:00

For Ubuntu 9.04 When requesting the usage of fputs() in my Ubuntu 9.04, I got no manual entry for fputs(). Google tells me ... $ man fputs No manual entry for fputs $ sudo apt-get install manpages-dev manpages-posix-dev glibc-doc @ 2009-11-17 manpages-posix-dev ... for pthread ... glibc-doc ... for others... .

signal() and kill command

2009-05-15T20:54:00.022+08:00

#include #include #include void ouch(int sig) { printf(" <--- OUCH ! - Got signal - %d\n", sig); signal(SIGINT, SIG_DFL); } int main() { signal(SIGINT, ouch); while(1) { printf("Hello SIGINT !\n"); sleep(1); } } signal in main(): set ouch() as the SIGINT handler signal in ouch(): set SIGINT handler to default, terminate process If you SIGINT handler is not

QT Resource File

2009-05-12T11:48:00.011+08:00

Create your own RESOURCE FILE with .qrc extension, and its format as below Panda_32x32.png Turtle_32x32.png Execute qmake -project, the RESOURCES += myRC.qrc will be added in project (.pro) file ##################################################################### # Automatically

fork() demo

2009-05-11T11:59:00.003+08:00

#include #include #include int main() { pid_t self, parent, child; self = getpid(); parent = getppid(); int i=0, n=0; printf("PID: %d, PPID: %d (before fork) \n", self, parent); child =fork(); if(child==0) { // child process printf("child=fork() == 0 (child process)\n"); printf("PID: %d, PPID= %d\n", getpid(), getppid()); // i, n in child process

LDD3 Errata

2009-05-06T22:21:00.007+08:00

When I read Chapter 3 - Char Drivers of the LDD3 from internet, I found request_chrdev_region seems to be a typo of register_chrdev_region, and then found the errata of this book. Please refer to this page for detail. http://oreilly.com/catalog/linuxdrive3/errata/ You can find the on-line book of Linux Device Drivers, Third Edition in O'Reilly Open Books Project :)

Play .vmdk by Virtual Box in Ubuntu

2009-05-05T22:03:00.007+08:00

Ubuntu 9.04 + VirtualBox 2.2.2 1. Add your .vmdk in Virtual Media Manager. 2. Create a new virtual machine. 3. Use existing hard disk. (the one just added in step 1.) 4. Power on the new Fedora. 5. Fedora Core 2.6.9 is booting :) Then I can do something with Fedora in Ubuntu... No more Windows and VM Ware !

The Hello kernel module in Ubuntu 9.04

2009-05-01T22:53:00.010+08:00

Prepare hello.c and Makefile as below for the first kernel module. hello.c #include #include #include /* use insmod to load module msg log to /var/log/messages use tail or lsmod to check */ static int __init my_init(void) { printk("<1> Hello, Orz...\n"); return 0; /* if -1, operation not permitted */ } /* use rmmod to unload module *

Compile kernel module in Ubuntu 9.04 - Preparation

2009-05-01T22:26:00.005+08:00

The installed Ubuntu 9.04 here is a desktop version. Therefore I need to install the additional linux source before next step. apt-get install linux-source Then you will get a tarball linux-source-2.6.28.tar.bz2 in your /usr/src. Now change your directory to /usr/src and unpack the tarball. cd /usr/src tar xjf linux-source-2.6.28.tar.bz2 & (or you may unpack in this way bzip2 -d linux-source

Screen Capture in Ubuntu

2009-04-30T16:21:00.005+08:00

In Ubuntu, you can easily capture the full screen by press [Print Screen]or [Alt]+[Print Screen] to capture the image of an activated window.And then image processing program can be used to modify the captured image if necessary.

Windows XP in Virtual Box on Unbuntu

2009-04-30T11:59:00.005+08:00

Some website applications are not running well in Linux platform. So that I shall have one copy of Windows XP. And the free solution is Virtual Box... [*] Host OS : Ubuntu 9.04 [*] Virtual Box 2.2.2 r46594 Download your Virtual Box from its website first. (http://www.virtualbox.org/wiki/Downloads) And then install it. [*] Guest OS : Windows XP Service Pack 2

OS Exercise - Disk Scheduler

2009-04-30T11:09:00.004+08:00

A simple C program which implements the disk scheduling algorithm including FCFS, SSTF, SCAN, CSCAN, LOOK and CLOOK. Please choose your disk scheduling algorithm: 1. FCFS - First Come First Serve 2. SSTF - Shortest Seek Time First 3. SCAN - 4. CSCAN - Circular Scan 5. LOOK - Scan without moving to ends 6. CLOOK - Circular Look without moving to ends Your choice is (1~6, other input means

OS Exercise - Memory Allocation

2009-04-30T10:50:00.012+08:00

Screenshot as below. It can do First/Best/Worst Fit... Please choose your allocation algorithm: 1. First Fit 2. Best Fit 3. Worst Fit Your choose is (1/2/3, other input means EXIT): 2 MAIN MEUN 1. Display memory usage status 2. Input memory request to request queue 3. Allocate memory to the first requestor in queue 4. Terminate process in memory 5. Exit Please enter your choice (1-5):2

3 Qt Exercises After 1 Week Classess

2009-04-30T10:33:00.005+08:00

After one week classes, we are asked to write some codes. 1. Something like ping-pong. >> (2 buttons are used, one as ball and another as board). 2. A simple painter. >> Undo 3. An address book records some basic information. >> Open/Save/Insert/Delete/Head/Prev/Next/Tail It's a pity that I don't have time to improve them at this moment. Because more other lessons are there.

Qt 4.5 SDK Installation

2009-04-25T11:13:00.004+08:00

Download the SDK from Qt website. http://get.qtsoftware.com/qtsdk/qt-sdk-linux-x86-opensource-2009.02.bin Then make the file executable by chmod u+x. Execute as root. ./qt-sdk-linux-x86-opensource-2009.02.bin Then you can find Qt Creator in /opt/qtsdk-2009.01 (default) or somewhere you specify during installation. However something may be required if someother packages are not present.

ubuntu 9.04 Installation from HDD

2009-04-25T10:49:00.003+08:00

If you want to taste Ubuntu in your XP only, click the wubi.exe in the live cd. or you want a new Ubuntu in another partitiom. 1. Put the live iso in a FAT partition. 2. Extract the vmlinuz, initrid.gz from casper in iso file... 3. Install Grub4dos if you have XP only. 4. and add some words in your menu.lst as below title (090424) Install Ubuntu 9.04 root (hd0,5) kernel /vmlinuz boot=casper

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

2009-04-25T10:43:00.003+08:00

chanyenping@chanyenping:~$ mysql ERROR 1045 (28000): Access denied for user 'chanyenping'@'localhost' (using password: NO) chanyenping@chanyenping:~$ mysql -u root -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 5 Server version: 5.0.75-0ubuntu10 (Ubuntu) Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql>

Fedora 10 Installation

2009-02-15T10:14:00.004+08:00

We're requested to develop programs in Linux in the future. Therefore I've to move Linux in my home box. Becasue the OS used in class is Fedora 10, then I choose Fedora 10 as my first Linux OS. If the VM Ware is used in my old Windows XP, it will get poor performance due to the main memory is only 512MB. So I decided to install the Fedora 10 to physical partitions. Because I don't want to

DEBUG

2009-02-15T09:59:00.000+08:00

Finally I knew that we mayuse gdb to debug my c program.