Kernel Development Learning Pipeline

Create a Custom Syscall

Create a custom syscall to the x86 64 bit architecture that tells you the current state of the system.

What to Submit

• Implementation of the new syscall as a series of patches
• Source code to a userspace utility that tests the functionality of the new created syscall
• Time spent on assignment

Procedure

• Clone Linuses git tree.
• Checkout release version 6.10
• Checkout our own branch
• Implement a new syscall for x86 64 bit architecture
• Write a user space utility that will prove the functionality of the new syscall

Requirements

• Number of the new syscall is 600 (600 decimal)
• The syscall will take one numerical parameter as an input
• The syscall will return one numerical parameter as an output
• If the input of the syscall is 1, the syscall will return count of currently running processes
• If the input of the syscall is 2, the syscall will return count of currently loaded modules
• If the input of the syscall is 3, the syscall will return count of filesystems, that require a block device
• If the input of the syscall is any other number a constant -1 will be returned
• The patches for the syscall need to pass the checkpatch.pl script
• Patches will be generated using git format-patch from your patches, with each patch describing your changes and a cover letter explaining the whole project

Hint: All of system information can be checked in the /proc directory from the user space

Points

• Maximum points for this assignment are 20.