After about 5 months of separation from my preferred operating system, the discontent brought by Mac Os X led me to a re-born love with Gnu/Linux.
I Installed Gentoo (~x86, not x86) on my MacBook, following some articles found on the Gentoo wiki and on Ubuntu wiki.
The result is the following:
Clean Desktop
Some things opened: Gnome Menu, Gnome Terminal, Nautilus, Scite
Features:
- Gnome 2.22.2
- MurrinaGilouche + Elementary Metacity (link – link)
- black-white 2 Gloss Icons (link)
- Screenlets [RingSensors] (link)
- A wallpaper included in Gnome, still looking for the perfect one
Let’s have some fun with Gnu/Linux…again!
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Categories: Free*, Misc Tags: come back, freedom, gentoo, Gnome, how, HTTP, HTTPS, link, linux, love, Mac Os, mac os x, macbook, Nautilus, paper, php, PNG, ubuntu, wall, Wiki
We finally finished our university project, Unipoli. The Java implementation of the famous Monopoly game by Hasbro has been released under GPLv3 (yes it’s free software) . You can have a look at the source code, simple but elegant, written using coding standards, following xP practices and Scrum software development process (at least we tried to follow them).
On the project site you will find useful documentation, too: Vision Statement, User Stories, Noun Extraction, Product Backlog, UML Classes, Hierarchy and Relations, UML class diagram, Javadoc.
The game has been written for Programming Project course.
Read more…
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Categories: Activism?, Programming Tags: code, deb, document, free software, gpl, how, HTTP, HTTPS, java, Layers, layout, monopoli, paper, php, pro, Programming, programming project, project, release, scrum, scrum method, sid, site, software development process, software engineering, source, source code, standard, Unibz, university, version, Wiki, wikipedia
As you see, the blog has a brand new theme! the blog’s theme has got a new, fresh look! I decided to bring some new improvements and a change in the layout. Let me experiment with it, fix some bugs and then I will release the source code, as always
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Categories: Activism?, Blog Tags: BD-theme, Blog, bodom_lx free software, brand, bugs, change, code, Experiment, fix, free software, gpl, layout, php, pro, release, source, source code, theme, web development, wordpress
BD-shell is a project I started about a month ago, which aims to implement a tiny, simple, clean unix shell written in C language. It’s an academic project. The Operating Systems Course at my University requires this project as part of the assesment.
I decided to publish the source code and to release it under the GPL, for two reasons:
- Free software is better! Others can learn something from what I learned
- Free software is better! I can learn something from what others learned
As always, I accept every kind of suggestions!
Learn more about the project and download the code at this page:
http://task3.cc/projects/bd-shell/
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Categories: Programming, Unibz Tags: academic, BD-shell, bodom_lx free software, C language, C shell howto, code, Download, free software, gpl, HTTP, HTTPS, language, opensource, page, php, pro, project, projects, release, shell, simple C shell, source, source code, tiny c shell, Unibz, university, unix, unix shell
Time for two new C programs! At the DSA course I learned something about Hash Tables and collision resolutions.
I just implemented insert/search/print operations.
The first source code is an implementation of a Hash Map with open addressing (linear probing) as collision resolution method.
The following are the interesting functions of the program. As always, take a look at the source code for comments:
// hashMapLinear[] is the hash map
void linearProbingInsert
(int value
){
int probe = hash
(value
);
while (hashMapLinear
[probe
]!=
0){
probe = fmod
((probe
+1),SIZE_HASH_MAP
);
}
hashMapLinear
[probe
] = value;
}
int linearProbingSearch(int value){
int probe = hash(value);
int i;
for(i=0;i<size_hash_map ;i++){
if(hashMapLinear[probe]==value)
return TRUE;
probe = fmod((probe+1),SIZE_HASH_MAP);
}
return FALSE;
}
Download: hash-map-linear-probing.c
The second program is an implementation of a Hash Map with chaining as collision resolution method.
Interesting functions:
// t_hashTableNode is a struct that is created as single linked list
void chainedHashInsert
(int value
){
int probe = hash
(value
);
if(hashMapChained
[probe
] ==
NULL){
hashMapChained
[probe
] = malloc
(sizeof(t_hashTableNode
));
hashMapChained
[probe
]->value = value;
hashMapChained
[probe
]->next =
NULL;
}else{
t_hashTableNode *hashTableNode = hashMapChained
[probe
];
while(hashTableNode->next!=
NULL){
hashTableNode = hashTableNode->next;
}
hashTableNode->next = malloc
(sizeof(t_hashTableNode
));
hashTableNode->next->value = value;
hashTableNode->next->next =
NULL;
}
}
int chainedHashSearch(int value){
t_hashTableNode *hashTableNode = hashMapChained[hash(value)];
while(hashTableNode!=NULL){
if(hashTableNode->value==value){
return TRUE;
}
hashTableNode = hashTableNode->next;
}
return FALSE;
}
Download: hash-map-chaining.c
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Categories: Programming Tags: address, algorithms, C language, code, data structures, Download, hash, hash map, hash table, HTTP, java, javascript, link, list, page, pageTracker, php, pro, rest, source, source code, Wiki, wikipedia
BD-shell (a.k.a. bdsh) is a tiny Unix shell written in C. It’s a project required for the Operating System Course at my University.
It is written using a clean coding style, following xP coding standard philosophy.
Version 1.0 is the release that satisfies all the course requirements!
Quick Jump:
Features
Download
License
Cool Features
- Lightweight
- Implements real Job Control
- Clear and understandable code, ideal for Academic (and personal) studies
- Makes use of various system calls, signals, signal handlers, user input handling, data structures implementation
- Free Software!
Cool Features NOT present (but may be in future)
- No command history present
- No command/filename auto completion
- No wildcars
- No command piping, just a single command can be launched at a time
- Put everything else here.
Requirements for 1.0.0 (click the arrow)
These are the requirements asked by the teaching professor. The complete project description page is located at
http://www.inf.unibz.it/~david/os/project.html
The shell must be able to do the following:
- to read commands from standard input and execute them in a loop until a
built-in command exit is issued (we call these processes the foreground processes; there is always at most one of these at any particular time);
- be able to redirect the standard input and output of commands by prefixing them with built-in commands in file and out file;
- be able to terminate (involuntarily) the foreground process when user presses ^C and return back to the mini-shell;
- be able to interrupt the foreground process temporarily, when user presses ^Z, returning to the mini-shell;
- be able to execute any number of processes in background (i.e., in parallel with the foreground process), including in particular, the ability to start another process while a process has been temporarily suspended;
- inform the user when the background process finishes or is
waiting for an input from the terminal;
- be able to inform the user what commands are executing in the background by issuing the built-in command jobs, this should include information about the state of the process (i.e., suspended, background, waiting for input, etc.) and about what file(s) is the background process using for standard input and output);
- be able to terminate involuntarily a background processes by issuing the built-in command kill job-number.
- to be able to resume a process or to make a background process into the foreground process (i.e., the one that currently interacts with the terminal) by issuing the fg job-number command.
- 2008-09-14 – version 1.0.0.
- fixed synchronization bug in putJobBackground() that made not notify background processes requesting input (in some situations)
Known Bugs:
- Lots of! I consider bdsh-1.0.0 stable because it covers ALL requirements of the course and does them whell on various Unix systems. So it works, but commands like “in non_existent_file cat” won’t work and will crash it!
What will be next?
- I don’t know. I may consider a 1.0.1 release to fix future bugs. I may also think to add cool features to make the shell complete. I hope I will have the time for it. You can also do it by yourself and send me the code
Old Releases (click the arrow)
- 2008-09-13 – version 1.0.0 Release Candidate 2.
Changes from beta 1 / release candidate 1
- removed gcc O3 flag from makefile
- lots of bugs fixed in functions operating on the list of jobs
- improvements in launchJob() when dealing with background commands
- bug in putJobBackground() that made the shell crash has been fixed
- killJob() now sends a SIGKILL
- bugs fixed in signalHandler_child()
- Code formatted using astyle (linux style)
- A couple of variables renamed
- Various usleep() removed
Known Bugs:
- So many =) This is a shell made for Academic purposes, not for production use!
- 2008-07-30 – version 1.0.0 beta1.
Characteristics:
- First beta release of the final version
- Every requirement has been covered
- Real Job-Control implemented
- About every function of bdsh.c has been rewritten
- New source directory layout, very clean
- Some documentation and makefile
- IMPORTANT! this has to be considered a bug hunting release! Please report me any bugs
-
2008-06-05 – version 0.7.1, corrects the linked list bug of version 0.7.0
- 2008-05-09 – version 0.7.0.
UPDATE 2008-06-05: there is a bug in the list handling, the shell crashes when using the standard input redirection. Please download version 0.7.1, which corrects the problem.
Characteristics:
- Cleaner code!
- Lots of bugs fixed!
- reads commands from standard input and executes them in a loop until a built-in command exit is issued
- redirects STDIN and STDOUT of commands by prefixing them with built-in commands in file and out file
- terminates (involuntarily) the foreground process when user presses ^C and return back to the shell
- executes any number of processes in background (i.e., in parallel with the foreground process)
- informs the user when the background process finishes
- informs the user what commands are executing in the background by issuing the built-in command jobs
- terminates involuntarily a background processes by issuing the built-in command kill job-number.
- Due to a lots of compatibility issues with Gnu/Linux (the shell has been developed under Mac Os X), the final released has been delayed to mid-September. Sorry for this, I encountered so many problems the day before project presentation, that I decided to present it during the next exam session. I switched back to Gnu/Linux, too
-
Final release is scheduled on 2008-06-26, as the project deadline is 2008-06-25. The release will
satisfy all the requirements, and as addition:
- Execution system totally rewritten (e.g. one single short function that handles everything)
- A Job Control will be implemented
- Processes in foreground will really be in foreground, there are a lot of things that we did not learn during the course, like tcsetpgrp()
- Some functions in utils.h will be deleted and optimized
- Cleaner and clearer code!
- 2008-04-21 – version 0.0.1
Characteristics:
-
Modular code, divided in 3 files: bdsh.c, utils.h, headers.h
-
Clean user input from a char buffer to an array of strings
-
Built-in commands: exit (exits from the shell), cd (changes directory), in <filename> command (redirects STDIN of command from <filename>), out <filename> command (redirects STDOUT of command to <filename>)
-
Makes use of fork() to read commands from standard input and execute them
BD-shell is released under The Gnu GPL version 3! This is different from the license of the contents of the blog
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http ://www.gnu.org/licenses/>>.
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Categories: My Life Tags: academic, aria, background command, BD-shell, Beta, beta release, Blog, bugs, candidate, change, code, data structures, DELETE, document, Download, fix, free software, gpl, HEAD, HTTP, HTTPS, java, javascript, job, layout, link, linux, list, Mac Os, mac os x, page, pageTracker, personal, php, pro, project, PUT, rc2, release, release candidate, report, set, shell, sid, signal handlers, Signals, source, standard, System Calls, Unibz, university, unix, unix shell, URI, variables, version, Wiki, wikipedia
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