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Showing posts from April, 2010

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

Linux kernel module to add a proc file entry

A look at the proc_dir_entry structure struct proc_dir_entry { unsigned int low_ino; unsigned short namelen; const char *name; // name of our module mode_t mode; // permissions ,who can read and write to it nlink_t nlink; uid_t uid; gid_t gid; loff_t size; const struct inode_operations *proc_iops; const struct file_operations *proc_fops; struct proc_dir_entry *next, *parent, *subdir; void *data; read_proc_t *read_proc; // pointer to the function to be called when we do a read to the proc entry write_proc_t *write_proc;// pointer to the function to be called when we do a write to the proc entry atomic_t count; int pde_users; spinlock_t pde_unload_lock; struct completion *pde_unload_completion; struct list_head pde_openers; }; Now let us write a LKM to add a proc entry . When you write to our proc entry it stores the msg you write and when you read from it , it displays t