Help With UART RS-232 IRQ NEEK

I work with the NEEK, i am new in altera products. I am learning.

I work with a data adquisition in rs232, but i want use the uart interrupt because i need do other processes.

I have the basic code:

# include <stdio.h>

# include <string.h>

# include <sys/alt_alarm.h>

# include "system.h"

# include "alt_types.h"

# include "sys/alt_cache.h"

# include "sys/alt_irq.h"

# include "altera_avalon_pio_regs.h"

# include "io.h"

# include "altera_avalon_uart_regs.h"

# include "altera_avalon_uart.h"

int main(){

FILE*fp;

fp = fopen ("/dev/uart1", "r+"); // abro el puerto uart1

int prompt;

while(1){

prompt = getc(fp); // obtengo caracter dell UART.

}

fclose (fp); //Cierro el Puerto

}

and I want convert the previous code in this:

# include <stdio.h>

# include <string.h>

# include <sys/alt_alarm.h>

# include "system.h"

# include "alt_types.h"

# include "sys/alt_cache.h"

# include "sys/alt_irq.h"

# include "altera_avalon_pio_regs.h"

# include "io.h"

# include "altera_avalon_uart_regs.h"

# include "altera_avalon_uart.h"

/// what I do in this place?

void isr_uart1()// when uart1 rs232 interrupt make this process automatic

{

int prompt;

prompt = getc(fp);

}

int main()

{

/// how I do enable the interrupt in this place?

while(1){

// my process

}

}

thanks, if someone can help me with code.