System Programming

Welcome, thanks for using my system programming repository. Here I try to document every practical hands-on computer sessions. It may not be up to date, but I'm working on it...

Table of contents

1. How does it work ?
2. Headers
   1. colors.h
   2. prog_sys.h
   3. std.h
3. Makefile Makefile Makefile
   1. Makefile
   2. TP_Makefile

How does it work ?

I create a new directory for each new session we have with the same structure :

./TP_n/
├── .gitignore
├── bin/
├── doc/
│   ├── .gitignore
│   └── notes.md
├── src/
└── Makefile

Generally what you're looking for are the source code in src/ and the report in doc/.

Headers

In system programming, many libraries are necessary, and we always need to include the same header files. Thus, I created 3 header files regrouping them to simplify things : colors.h, prog_sys.h and std.h. Including them in your source file is like including any standard library, the Makefile will take care of finding them in the utils directory during the compilation.

#include <colors.h>
#include <prog_sys.h>
#include <std.h>

// make sure to use <> and not ""
// refer to the Makefile for further explanation

colors.h

This file is just here to define some color codes. I use it to differenciate the outputs of different processes.

#define BLACK "\033[0;30m"
#define RED "\033[0;31m"
#define GREEN "\033[0;32m"
#define YELLOW "\033[0;33m"
#define BLUE "\033[0;34m"
#define PURPLE "\033[0;35m"
#define CYAN "\033[0;36m"
#define WHITE "\033[0;37m"

prog_sys.h

This file includes all the libraries needed by the functions and procedures we study in system programming.

#include <unistd.h>   /* sleep */
#include <signal.h>   /* signal */
#include <unistd.h>   /* sleep, alarm, fork */
#include <sys/wait.h> /* wait */
#include <sys/types.h> /* open */
#include <sys/stat.h> /* open */
#include <fcntl.h> /* O_WRONLY, O_RDONLY */

std.h

This file includes all the standard libraries usually used in C

#include <stdio.h>  /* printf */
#include <stdlib.h> /* fopen, srand, rand*/
#include <string.h> /* strlen, strsignal */

Makefile Makefile Makefile

In the main directory are two Makefiles : Makefile and TP_Makefile. The first one is for creating a new session directory and the second one is to automate the compilation.

Makefile

In this file, there is only one command : newTP : $(TP). As you can see, it requires a parameter which is the name of the directory you wich to create and it will automatically create the directory and all of ots sub-directories while alos importing the usefule files from utils/.

Example :

make newTP TP=TP_test

# Ouput :

# === Création du répertoire TP_test
# === Création des sous-répertoires src bin et doc
# === Création du fichier Markdown
# === Création du fichier Makefile
# === Création du fichier .gitignore

TP_Makefile

This file a simple automation of the compilation process. I just added two parameters : $(src) and $(bin) because many source files and binaries are used during a single session. Please refer to the following example for better understanding. Don't bother copying it in your directory the first Makefile automatically does it at its creation.

Example :

make bin=binName src=srcFile 
# Warning : do not add the .c suffix to the source file name