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Installing ns-3.37 and ns-3.35 in Ubuntu | Ubuntu 22.04 | NS3

Multiple Versions of ns3 in Ubuntu 22.04 In this post, we are going to install two versions of ns3 namely ns-3.35 and ns-3.37  My OS is : Ubuntu 22.04 LTS (Long Term Support) ns-3.35 uses waf and (./waf --run scratch/first)  ns-3.37 uses cmake  (./ns3 run scratch/first.cc) So we will install both the packages  Go through the video for complete instructions To start with  $ sudo apt update  $ sudo apt install build-essential autoconf automake libxmu-dev g++ python3 python3-dev pkg-config sqlite3 cmake python3-setuptools git qtbase5-dev qtchooser qt5-qmake qtbase5-dev-tools gir1.2-goocanvas-2.0 python3-gi python3-gi-cairo python3-pygraphviz gir1.2-gtk-3.0 ipython3 openmpi-bin openmpi-common openmpi-doc libopenmpi-dev autoconf cvs bzr unrar gsl-bin libgsl-dev libgslcblas0 wireshark tcpdump sqlite sqlite3 libsqlite3-dev  libxml2 libxml2-dev libc6-dev libc6-dev-i386 libclang-dev llvm-dev automake python3-pip libxml2 libxml2-dev libboost-all-dev  I have downloaded both the versions of ns3 fr

Introduction to Proc File System

  • The proc file system provides information on the current status of the Linux kernel and running process.
  • It also allows modifications of kernel parameters in simple ways during runtime
  • Each process in the system that is currently running is assigned a directory /proc/pid, where pid is the process identification number of the relevant process
  • There are also files and directories for process independent information such as loaded modules, used bus systems etc.

Disadvantages of Proc

  • There is no interface for the individual files, every user has to find out where and how the information that is required is hidden in the file
  • Another disadvantage is that all information is output as strings, therefore conversion is always necessary for further processing

Structure of File system

struct proc_dir_entry

{

unsigned short low_ino; //inode number

unsigned short namelen; //length of the name

const char *name; //name of the entry

mode_t mode; //mode

uid_t uid; //User ID

gid_t gid; //Group ID

unsigned long size; //size of the file

struct inode_operations *proc_iops; //inode-op

struct file_operations *proc_fops; //file-op

struct proc_dir_entry *next, *parent, *subdir; //connection

….

}

The above structure is as PD entry.

  • The pointer next, parent, subdir are used for linking. Next shows the next entry in the current directory, parent shows the parent directory (root directory), and subdir shows a subdirectory. This can be implemented like the following loop

for(de=de->subdir ; de; de=de->next){

…..

}

  • the file and the directory entries are lying under the /proc/ directory

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