keyboard driver: How does os send data to program

[garob]

The keyboard driver catches the interrupt, figures out which key was pressed, then sends a message to the user program. How do I send it to that message?

[AJ]

Hi,

How do you do your normal IPC?

Cheers,
Adam

[piranha]

The way that I see it, the kernel does not send the data - the process retrieves the data through some sort of read call. The way I see it, the key is pressed and the kernel catches the int and then stores the pressed key to a buffer. Then the user process performs a system call and the kernel returns one (or more) keys stored in the buffer.

Of course, this isn't the only way, you could send a pressed key to a process by means of a signal or message...

-JL

[Creature]

Or you could have your application (when initializing) perform a system call that registers an event handler function, which is called when a keyboard interrupt occurs (à la Win32?).