Network Security Tools

Compiling and Testing hello_world

To compile the preceding source code, create the following makefile:

obj-m += hello_world.o

Compile by running make:

[notoot]$ make -C /usr/src/linux-`uname -r` SUBDIRS=$PWD modules
make: Entering directory `/usr/src/linux-2.6.8
  CC [M]  /tmp/lkms/hello_world.o
  Building modules, stage 2.
  MODPOST
  CC      /tmp/lkms/hello_world.mod.o
  LD [M]  /tmp/lkms/hello_world.ko
make: Leaving directory `/usr/src/linux-2.6.8

Run the insmod tool to load the module:

[root]# insmod ./hello_world.ko
Hello World!

List loaded LKMs using the lsmod tool:

[root]# lsmod
Module                  Size  Used by
helloworld              2432  0

Remove the module by using the rmmod tool:

[root]# rmmod hello_world
Good Bye!