Very Computer

> Hey everybody, I want to respond to a hardware interrupt from a data
> acquisition card via ISA card. I manage to communicate with the card
> throught simply I/O program. And now I would like to write a user program
> with an interrupt handler.

> My questions are:
> 1) My first step is to install the interrupt handler to the kernel. The
> following is my source code. Is my structure of source code to install
> interrupt handler correct? What am I missing? And what functions and header
> files I need to install and service an interrupt routine?

> #include <linux/sched.h>

> main()
> {
>   unsigned int CAN_irq = 9;

> if (CAN_irq >= 0)
>    {

>      int result = request_irq(CAN_irq, CAN_ISR, SA_INTERRUPT, "CAN", NULL);

>      if (result)
>        {
>       printk(KERN_INFO "CAN card can't get assigned irq %i/n", CAN_irq);
>       CAN_ISR = -1;
>        }

>     return 0;
> }

> note: I also wrote CAN_ISR interrupt service routine.

> 2) Is there any example of device driver codes like this?

> 3) How to compile it? Is "gcc -O -D__KERNEL__ -o test test.c" correct?

> 4) Is it possible (reasonable, etc) to write a user program that uses a
> hardware interrupt without writing a device driver?

> For your information, I'm using RH 6.1 with gcc-2.91.66. I'm referring Linux
> Device Driver by Alessandro Rubini and Linux Kernel Internal by M Beck, U
> Kunitz and etc. Any other good references?

> Thank you.