How-to compile the Scull examples
As root on your virtual server execute the following commands:
$ yum install gcc kernel-xen-devel ncurses-devel $ yum update # # If a new kernel came in restart the server # $ init 6 # # Wait a few minutes and login once again #
Next create the ordinary users for the system with
$ adduser <username> $ passwd <username>
As root edit the /etc/group file and add a new group at the end. Copy the line above (one of the ordinary useres) and change the group number to bee different from any other numbers assigned in the file. Add the usernames after the last : having the file looking something like this:
klausk:x:500: moduledev:x:501:klausk
Now as an ordinary user unpack the example sources if you haven't done that already.
$ mkdir -p /home/eml1 $ chgrp moduledev /home/eml1 $ cd /home/eml1 # # Copy the examples to this location from where you've stored them i.e. cp /path/examples.tar.gz . # $ tar zxvf examples.tar.gz $ chgrp -R moduledev examples $ cd examples
Create a helper script as described below.
Helper script called settings.sh - to be run every time you enter this directory. It sets up the environment. To be placed in the examples directory.
#!/bin/bash # # Preparation for the compilation of the scull example code # KERNELDIR=/usr/src/kernels/2.6.18-194.11.4.el5-xen-i686/ export KERNELDIR
When entering the example directory execute this
$ . settings.sh # # To make the scull module perform: # $ cd scull $ make modules
Remember that only root can insmod a module in the kernel.
If you add a line like this into /etc/sudoers using visudo
klausk ALL=(ALL) NOPASSWD: ALL
You can now issue this to insert the module in the kernel:
$ sudo ./scull_load # # check if the module is loaded in the kernel # $ sudo /sbin/lsmod