asynchronous notification using fasync : LDD with Raspberry Pi #21
In this video, we explore asynchronous notification using fasync in Linux device driver development with Raspberry Pi.
So far in the series, we covered blocking I/O, wait queues, and poll/select mechanisms,
where the process waits for data. In this video, we take it a step further and implement signal-driven I/O,
where the process continues running and gets notified via SIGIO signals when data is available.
We walk through:
How fasync works in the Linux kernel
Implementing .fasync in the driver
Using fasync_helper and managing the async queue
Sending signals from the kernel using kill_fasync
Writing a user-space application to handle SIGIO
Enabling async mode using fcntl
Understanding how true asynchronous I/O works without blocking
By the end of this video, you will clearly understand how to implement non-blocking, signal-based
communication between kernel space and user space.
GitHub : https://github.com/madhawapolkotuwa/l...
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