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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

Pipes and Named Pipes (FIFO)

Pipes are the classical method of interprocess communication.

For example

# ls –l | more

The symbol | indicates a pipe and the shell in the above example runs the processes ls and more which are linked with a pipe. ls writes data to the pipe and more reads it.

Named pipes otherwise called as the FIFO (First in First Out) is the other variant of pipe.

They can be created like this

# mkfifo pathname

Example

# mkfifo hello

# ls –l hello

prw-r- -r- - 1 temp users 0 Aug 28 10.45 hello |

there are many similarities between the pipes and the FIFO, but the inode specification for the both are more or less the same.

following is the inode specification for the pipe

struct pipe_inode_info

{

wait_queue_head_t wait; //wait queue

char * base; //address of the FIFO buffer

unsigned int readers; //no of processes reading at this moment

unsigned int writers; //no of processes writing at this moment

unsigned int waiting_readers; //no of blocked process reading at this moment

unsigned int waiting_writers; //no of blocked processes writing at this moment

unsigned int r_counter; //no of read processes that have opened

unsigned int w_counter; //no of write processes that have opened

};

The length of the area of the pipe is managed in the i_size field. The system call pipe creates a pipe which involves setting up a temporary inode and allocating a page of memory which is decided by the architecture dependent model.

Opening a FIFO

    Blocking Non Blocking
For reading No Writing Processes Block Open FIFO
  Writing Processes Open FIFO Open FIFO
For Writing No Reading Processes Block Error ENXIO
  Reading Process Open FIFO Open FIFO
For Reading and Writing   Open FIFO Open FIFO

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