Device Driver - Worldcup

sudo rmmod worldcup
dmesg | tail

New low-latency wireless protocols require drivers that can dynamically switch between bands to avoid interference from microwaves or routers. The next generation of WorldCup drivers will include real-time spectrum analysis.

sudo apt install build-essential linux-headers-$(uname -r)

User-space applications (the fans) cannot write directly to the hardware (they can't just run onto the field). They must use ioctl calls to the Referee file descriptor. worldcup device driver

| Command | Description | Kernel Action | | :--- | :--- | :--- | | IOCTL_START_MATCH | Initializes the game timer and enables ball sensors. | modprobe players | | IOCTL_SUBSTITUTE | Swaps a process (player) in the active process list. | Unloads player_old.ko, loads player_new.ko. | | IOCTL_ISSUE_CARD | Writes a penalty flag to a player's process control block. | If RED_CARD: Signal SIGKILL sent to player process (immediate termination). | | IOCTL_EXTRA_TIME | Extends the timer jiffies count based on injury delay. | Recalculates timeout value. | sudo rmmod worldcup dmesg | tail