/*
 * proj1_tester.c
 * Description: test code for project 1
 * Author: Sung-hun Kim (shkim@csl.skku.edu)
 * Date: 2016.03.28
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>

#define MAPPED_SIZE 4096
#define OFFSET 0

int main(void) 
{
	int fdmem;
	int	i;
	int *map = NULL, *map2 = NULL;
	const char dev_path[] = "";	//your device path

	/* open device file and check error */
	fdmem = open( fake_dev, O_RDWR | O_SYNC );

	if (fdmem < 0){
		printf("Failed to open the %s!\n", dev_path);
		return 0;
	} else
		printf("open %s successfully !\n", dev_path);

	/* mmap() the opened device file */
	map = (int *)(mmap(0, MAPPED_SIZE, PROT_READ | PROT_WRITE, 
		MAP_SHARED, fdmem, OFFSET));
	map2 = (int *)(mmap(0, MAPPED_SIZE, PROT_READ | PROT_WRITE, 
		MAP_SHARED, fdmem, OFFSET));

	/* use map pointer to access the mapped area! */
	printf("map1\n");
	for (i = 0; i < 10; i++)
		printf("content: 0x%x\n",*(map+i));
	
	printf("map2\n");
	for (i = 0; i < 10; i++)
		printf("content: 0x%x\n",*(map2+i));

	/* access to mmaped region for modifying it */
	printf("modify contents\n");
	for (i = 0; i < 10; i++)
		*(map+i) = i;

	printf("map1\n");
	for (i = 0; i < 10; i++)
		printf("content: 0x%x\n",*(map+i));
	
	printf("map2\n");
	for (i = 0; i < 10; i++)
		printf("content: 0x%x\n",*(map2+i));

	/* unmap the area & error checking */
	if (munmap(map, MAPPED_SIZE) == -1)
		printf("error occurred while un-mmapping map1\n");
	
	if (munmap(map2, MAPPED_SIZE) == -1)
		printf("error occurred while un-mmapping map2\n");

	/* close device file */
	close(fdmem);
	return 0;
}